Freestyle suit for prompting leg technique action posture

Abstract

This invention relates to a freestyle swimming garment that provides guidance on leg movement techniques, belonging to the field of swimming apparel. It addresses at least one of the following problems with existing swimwear: limited effectiveness in improving the efficiency of freestyle leg kicks, poor drag reduction, limited flexibility, and insufficient support. The freestyle swimming garment, which provides guidance on leg movement techniques, is made of stretchable fabric. When worn, the stretchable fabric covers the area from the neck to the knees, with the side closest to the skin being the reverse side. The freestyle swimming garment includes tension bands, localized pressure zones, and seams. This invention improves the standardization and efficiency of freestyle leg kicks, enhances overall drag reduction, and achieves a balance between support and flexibility.

Description

Technical Field

[0001] This invention relates to the field of swimming apparel technology, and more particularly to a freestyle swimming apparel that provides guidance on leg movement postures. Background Technology

[0002] In freestyle swimming, the leg kick plays a crucial role in overall swimming speed. Studies show that approximately 20% to 30% of the propulsion in freestyle swimming comes from the leg kick. An efficient leg kick requires the swimmer to point their toes while simultaneously internally rotating their feet to create the optimal surface for propulsion resistance, concentrating the thrust more effectively backward.

[0003] Currently, most high-performance racing swimsuits on the market focus on improving athletes' general performance through overall compression and low-resistance fabric technology. Their designs primarily focus on drag reduction and full-body compression, without addressing the specific biomechanical characteristics of different swimming strokes. Specifically, existing swimsuits have significant shortcomings in guiding leg movements in freestyle swimming: their design is completely passive, failing to provide any external assistance, correction, or real-time feedback on leg technique posture.

[0004] Therefore, athletes rely entirely on their proprioception and motor proficiency to maintain their leg technique posture during training and competition. This reliance makes technical movements, especially leg movements, prone to deviations due to fatigue or distraction, making it difficult to maintain standardization and consistency throughout the movement. This limits the maximization of leg propulsion and hinders further improvement in athletic performance. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a freestyle swimsuit that prompts the posture of leg movements, in order to solve at least one of the following problems of existing swimsuits: limited effect on improving the efficiency of freestyle leg movements, poor drag reduction effect, limited flexibility, and insufficient support performance.

[0006] The objective of this invention is achieved through the following technical solution: This invention provides a freestyle swimsuit that prompts leg technique postures. It is made of stretchable fabric, which covers the area from the neck to the knees when worn, with the side closest to the skin being the reverse side. The freestyle swimming suit includes tension bands, localized pressure zones, and seams; The tension band is fixedly installed on the reverse side of the freestyle swimming garment. The design position of the tension band is determined based on the pressure cloud map and sports biomechanics. The tension band includes two main reinforcing ribs that are symmetrical on both sides, and two pairs of auxiliary reinforcing ribs that are symmetrical on both sides. The main reinforcing fascia extends from the medial side of the knee joint on the same side in an S-shaped path to the thoracolumbar fascia region; each of the first pair of auxiliary reinforcing fascia starts from the lower part of the buttock on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a first intersection point; each of the second pair of auxiliary reinforcing fascia starts from the upper 1 / 2 region of the medial side of the thigh on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a second intersection point; wherein, the second intersection point is further away from the midline of the human body than the first intersection point on the same side; The localized pressurization area uses multi-layered fabric, and the design location of the localized pressurization area is determined based on the pressure cloud map; The design area and design direction of the joint are determined based on the surface streamline diagram.

[0007] Furthermore, the main reinforcing fascia originates above the medial side of the knee joint and extends obliquely upward in an S-shaped path: it transitions from the front of the thigh to the lateral side of the thigh, ascends along the iliotibial band, crosses the gluteus medius region, and terminates in the thoracolumbar fascia region on the posterior side of the body.

[0008] Furthermore, the first pair of auxiliary reinforcing ligaments includes a first auxiliary reinforcing ligament and a second auxiliary reinforcing ligament that are symmetrical on both sides. The first auxiliary reinforcing ligament and the second auxiliary reinforcing ligament originate from the lower edge of the buttock, extend obliquely upward along the outer side of the back of the thigh, penetrate the gluteus maximus muscle region, and form a cross support structure with the main reinforcing ligament in the gluteus medius muscle region.

[0009] Furthermore, the second pair of auxiliary reinforcing ligaments includes a third auxiliary reinforcing ligament and a fourth auxiliary reinforcing ligament that are symmetrical on both sides. The third auxiliary reinforcing ligament and the fourth auxiliary reinforcing ligament originate from the middle region of the gracilis muscle, run obliquely upward through the inner side of the posterior thigh and the lower gluteal region, and form a cross support structure with the main reinforcing ligament in the gluteus medius region.

[0010] Furthermore, the local pressure area includes: a first leg pressure area and a second leg pressure area arranged symmetrically on the left and right sides, the first leg pressure area and the second leg pressure area respectively covering the vastus lateralis muscle area on the anterolateral side of the same side thigh and the entire muscle group area on the posterior side of the thigh.

[0011] Furthermore, the localized pressurization area includes: a front pressurization section, which covers the chest, abdomen, and groin of the human body.

[0012] Furthermore, the seam includes a first seam and a second seam arranged symmetrically on both sides, and a third seam and a fourth seam arranged symmetrically on both sides; wherein, The upper ends of the first and second joints begin on the anterior side of the axilla, pass through the belly of the external oblique muscle, and terminate above the anterior superior iliac spine on the same side of the hip. The upper ends of the third and fourth joints originate from the middle of the latissimus dorsi muscle on the same side of the back, and their paths extend obliquely downwards, around the hip on the side of the body, and finally terminate below the perineum on the front side.

[0013] Furthermore, the seam includes a fifth seam and a sixth seam arranged symmetrically on both sides; the upper ends of the fifth seam and the sixth seam respectively start from the same side hip area, their paths extend obliquely downward along the anterolateral thigh, cross the lateral edge area of ​​the quadriceps femoris muscle, and the lower ends terminate on the lateral side above the knee joint.

[0014] Furthermore, in the main reinforcing rib, the sections located above the medial side of the knee joint to the lower anterior aspect of the thigh, and the sections located above the lateral side of the thigh to the hip side, are provided with thermoplastic elastomer films; and / or, In the first pair of auxiliary reinforcing ribs, each auxiliary reinforcing rib has a thermoplastic elastomer membrane disposed in the section from the lower edge of the buttock to the lower lateral part of the gluteus maximus muscle; and / or, In the second pair of auxiliary reinforcing ribs, each auxiliary reinforcing rib is provided with a thermoplastic elastomer film in the section from the inner thigh to the lower middle part of the back thigh; The thermoplastic elastomer film is located between the tension band and the stretch fabric.

[0015] Furthermore, the outer fabric of the freestyle swimming garment in the locally pressurized area is a textured fabric, and the design position of the textured fabric is determined based on the surface shear stress diagram; the textured fabric is a warp-knitted fabric with a vertical stripe structure formed by jacquard technology.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: (1) Based on a deep understanding of the leg movement mechanism in freestyle swimming, the inventors realized that the internal rotation of the foot is not accomplished by the twisting of the ankle alone, but by the internal rotation of the thigh driving the lower leg and the foot together. To this end, based on the tension band design position guided by the pressure cloud map, and combined with the study of the posture characteristics of freestyle swimming and the human anatomical structure, a tension band system (including main reinforcing ribs and auxiliary reinforcing ribs) with a significantly higher elastic modulus than the main stretch fabric was set on the inside of the swimsuit (i.e., the reverse side) along a specific biomechanical path of the leg, so as to provide a tension feedback that is significantly different from that of the main fabric when stretched.

[0017] When an athlete wears the freestyle swimming suit described in this invention, the reinforcing ribs apply directional elastic traction to the legs along a specific path, prompting the athlete to consciously internally rotate the thigh, thereby driving the lower leg and foot to complete the internal rotation movement of the foot. By arranging the ribs along the path from the knee to the thigh to the hip to the buttock, the reinforcing ribs generate appropriate pulling force during the athlete's leg kick, essentially providing a "signal" to prompt and assist the thigh in internal rotation, significantly improving the standardization and efficiency of the freestyle leg kick. This structure effectively solves the deficiency of existing swimsuits in not effectively prompting the internal rotation movement of the legs, assisting swimmers in developing correct freestyle leg posture, thus solving the problem of insufficient propulsion caused by improper leg movements and significantly improving water kicking efficiency.

[0018] (2) To address the problem of poor drag reduction effect, this invention guides the design area and direction of the seams of freestyle clothing based on the surface streamline diagram under the freestyle swimming posture. Combined with the characteristics of freestyle swimming posture and the study of human anatomy, the seam layout is optimized to minimize the increase in resistance caused by the seams. At the same time, the key areas that generate pressure difference drag are identified based on the pressure cloud map under the freestyle swimming posture. Combined with the characteristics of freestyle swimming posture and the study of human anatomy, the pressure difference between the high pressure area and the adjacent low pressure area is significantly reduced by implementing local pressure design in the key areas, so that the pressure distribution transition is smoother, thereby effectively improving the overall drag reduction effect.

[0019] (3) This invention achieves a balance between support and flexibility in key movement areas through the coordinated layout of localized pressure zones and a tension band system. Specifically, the localized pressure zones provide directional support for the core muscle groups, while the tension band system, distributed along a specific path, ensures freedom of movement while enhancing movement stability through elastic traction. The organic combination of these two elements with the highly elastic main body stretch fabric ensures both the necessary support strength and the natural flexibility during freestyle swimming.

[0020] (4) In some preferred embodiments, the present invention guides the design position of textured fabric by using the surface shear stress diagram under the freestyle swimming posture, and combines the study of the freestyle swimming posture characteristics and human anatomical structure. By using textured fabric in the outer layer of freestyle clothing in specific areas, more precise flow control can be achieved, the formation of flow separation zone can be suppressed, and the fluid resistance can be effectively reduced.

[0021] (5) In some preferred embodiments, by controlling the specific direction and / or position of tension bands, local pressure areas, seams, textured fabrics, and material parameters of some key tension bands and specific area fabrics, the various sections of the freestyle swimsuit and tension bands can achieve better synergistic effects, and further realize the synergistic optimization and improvement of auxiliary correction and prompting of leg technique posture, drag reduction performance, support performance, and flexibility.

[0022] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0023] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0024] Figure 1 A schematic diagram of the structure of a freestyle swimming garment that prompts leg movement techniques according to an embodiment of the present invention (a), (b) is a front view, (c) is a left side view, and (d) is a rear view; Figure 2 The following is a schematic diagram (II) of the structure of a freestyle swimming garment that prompts leg movement techniques according to an embodiment of the present invention: (a) is the front view, (b) is the left side view, and (c) is the rear view. Figure 3 The following is a schematic diagram of the structure of a freestyle swimming garment that prompts leg movements and postures according to an embodiment of the present invention (III), (a) is the front view, (b) is the left side view, and (c) is the rear view; Figure 4 The following is a schematic diagram of the structure of a freestyle swimming garment that prompts leg movement techniques according to an embodiment of the present invention (IV), (a) is the front view, (b) is the left side view, and (c) is the rear view; Figure 5 The following is a schematic diagram of the structure of a freestyle swimming garment that prompts leg movement techniques according to an embodiment of the present invention (V), (a) is the front view, (b) is the left side view, and (c) is the rear view; Figure 6 A schematic diagram (VI) of the structure of a freestyle swimming garment that prompts leg movement techniques according to an embodiment of the present invention, (a) is the front view, (b) is the left side view, and (c) is the rear view; Figure 7 A schematic diagram (VII) of the structure of a freestyle swimming garment that prompts leg movement techniques according to an embodiment of the present invention, (a) is the front view, (b) is the left side view, and (c) is the rear view; Figure 8 This is a schematic diagram of a characteristic freestyle swimming posture in an embodiment of the present invention; Figure 9 This is a pressure cloud map corresponding to the freestyle swimming characteristic posture in an embodiment of the present invention; Figure 10This is a surface streamline diagram corresponding to the freestyle swimming characteristic posture in an embodiment of the present invention; Figure 11 This is a schematic diagram of the seam design area and design direction of the freestyle swimming garment according to an embodiment of the present invention; Figure 12 This is a surface shear stress diagram corresponding to the freestyle swimming characteristic posture in an embodiment of the present invention; Figure label: 1-First main reinforcing ligament; 2-Second main reinforcing ligament; 3-First auxiliary reinforcing ligament; 4-Second auxiliary reinforcing ligament; 5-Third auxiliary reinforcing ligament; 6-Fourth auxiliary reinforcing ligament; 7-First leg compression section; 8-Second leg compression section; 9-Anterior compression section; 10-First joint; 11-Second joint; 12-Third joint; 13-Fourth joint; 14-Fifth joint; 15-Sixth joint; 16-Seventh joint; 17-Eighth joint; 18-Ninth joint; 19-Tenth joint; 20-Eleventh joint; A1-Attachment area of ​​medial collateral ligament and femoral muscle of the knee joint; B1 - Quadriceps tendon region on the lower front of the thigh; C1 - Lower and middle part of the vastus lateralis on the lower lateral side of the thigh; D1 - Upper lateral side of the thigh, adjacent to the lateral hip joint and the tensor fasciae latae muscle region; E1 - Lateral region of the gluteus medius muscle belly on the lateral side of the hip; F1 - Upper part of the buttock; G1 - Midline region of the thoracolumbar fascia; A2 - Lower edge of the buttock; B2 - Lateral region of the lower part of the gluteus maximus; C2 - Upper part of the gluteus maximus; D2 - Lateral region of the buttock; A3 - Middle region of the gracilis muscle; B3 - Middle part of the posterior thigh; C3 - Lower posterior region of the buttock; D3 - Buttock; E3 - Junction region of the gluteus maximus and gluteus medius muscles. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0026] To address the aforementioned issues, this invention combines swimsuit structural design with swimming posture characteristics. Through freestyle posture analysis, anatomical features, computational fluid dynamics flow characteristics calculations for freestyle characteristic postures, and drag analysis, a swimsuit structure optimized specifically for competitive freestyle swimming has been designed. Its core lies in the directional tension system formed by multiple reinforcing ribs built into the reverse side of the swimsuit. This prompts athletes to consciously perform internal thigh rotation, leading to internal foot rotation of the lower leg and foot, thus guiding and standardizing the freestyle kicking posture. Simultaneously, through the rational design of localized pressure zones and the design areas and directions of the seams, better drag reduction is achieved, balancing flexibility and sufficient support.

[0027] This invention provides a freestyle swimsuit that prompts leg technique postures. It is made of stretchable fabric, which covers the area from the neck to the knees when worn, with the side closest to the skin being the reverse side. The freestyle swimming suit includes tension bands, localized pressure zones, and seams; The tension band is fixedly installed on the reverse side of the freestyle swimming garment. The design position of the tension band is determined based on the pressure cloud map and sports biomechanics. The tension band includes two main reinforcing ribs that are symmetrical on both sides, and two pairs of auxiliary reinforcing ribs that are symmetrical on both sides. The main reinforcing fascia extends from the medial side of the knee joint on the same side in an S-shaped path to the thoracolumbar fascia region; each of the first pair of auxiliary reinforcing fascia starts from the lower part of the buttock on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a first intersection point; each of the second pair of auxiliary reinforcing fascia starts from the upper 1 / 2 region of the medial side of the thigh on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a second intersection point; wherein, the second intersection point is further away from the midline of the human body than the first intersection point on the same side; The localized pressurization area uses multi-layered fabric, and the design location of the localized pressurization area is determined based on the pressure cloud map; The design area and design direction of the joint are determined based on the surface streamline diagram.

[0028] Specifically, the main reinforcing fascia starts above the medial side of the knee joint and extends obliquely upward in an S-shaped path: it transitions from the front of the thigh to the lateral side of the thigh, ascends along the iliotibial band, crosses the gluteus medius region, and terminates in the thoracolumbar fascia region on the posterior side of the body.

[0029] It should be noted that, through the aforementioned specific path layout, the main reinforcing ribs cover multiple key areas from the knee joint, femur, hip joint all the way to the center of the pelvis. This unique path design achieves precise guidance of the lower limb kinetic chain: when the athlete performs a kicking motion, the reinforcing ribs, through their directional elastic traction, continuously prompt and assist the thigh in completing the internal rotation movement, thereby driving the lower leg and foot to achieve an ideal internal rotation posture. This mechanism effectively ensures that the foot forms the optimal propulsive resistance surface in the water, making the thrust generated by the kick more concentrated backward, significantly improving kicking efficiency. At the same time, the layout of the reinforcing ribs spanning multiple joints not only enhances hip stability but also forms a complete power transmission chain by effectively transferring lower limb power to the core area of ​​the torso, improving propulsive efficiency while reducing energy loss.

[0030] In a preferred embodiment, the main reinforcing rib includes a first main reinforcing rib 1 and a second main reinforcing rib 2 that are symmetrically arranged on both sides. The first main reinforcing rib 1 and the second main reinforcing rib 2 pass through the following seven key points or key areas (on the same side): A1 - Attachment area of ​​the medial collateral ligament and femoral muscle of the knee joint; B1 - Quadriceps tendon region of the lower anterior thigh; C1 - Middle and lower part of the vastus lateralis of the lower lateral thigh; D1 - Region of the lateral thigh adjacent to the hip joint and the tensor fasciae latae of the upper lateral thigh; E1 - Lateral region of the gluteus medius muscle belly on the lateral side of the hip; F1 - Upper region of the buttock; G1 - Midline region of the thoracolumbar fascia.

[0031] For example, A1 (origin): located in the region above the medial side of the knee joint, specifically at the junction of the medial collateral ligament (MCL) and the insertion point of the vastus medialis tendon.

[0032] For example, B1: located in the lower front thigh region, specifically at the origin of the quadriceps tendon.

[0033] For example, C1: located in the lower lateral thigh region, specifically in the lower middle segment of the belly of the vastus lateralis muscle.

[0034] For example, D1: located in the upper lateral thigh region, specifically the anterior superior border of the greater trochanter of the hip joint where the tensor fasciae latae muscle originates.

[0035] For example, E1: located in the lateral region of the hip, specifically covering the lateral belly of the gluteus medius.

[0036] For example, F1: located in the area above the buttocks, specifically covering the sacrospinalis muscle.

[0037] For example, point G1 (end point): located in the middle of the posterior side of the body, specifically in the middle region of the thoracolumbar fascia.

[0038] It should be noted that the key points or key areas within the main reinforcing rib work together synergistically to provide precise mechanical guidance and dynamic support for the freestyle leg kick. This multi-segment collaborative mechanism ensures that, throughout the complete leg kick cycle, the main reinforcing rib systematically guides the thigh to complete the compound movements of internal rotation, adduction, and push-off, thereby optimizing the foot's internal rotation angle and significantly improving propulsion efficiency. The functions of each segment are as follows: Segment A1B1 (A1~B1): Extends from above the inner side of the knee to the lower front of the thigh. This segment of reinforcing muscles crosses diagonally across the inner side of the knee joint to the front of the thigh, covering the medial knee ligament and the vastus medialis muscle area. Segment A1B1 applies an upward medial traction force to the knee joint, prompting and assisting swimmers to tighten their thighs towards the midline of the body at the beginning of the kick, preventing excessive outward separation of the knee, and laying the foundation for subsequent internal rotation of the thigh.

[0039] Segment B1C1 (B1~C1): This segment extends from the lower front of the thigh to the lower outer side of the thigh. This reinforcing ligament crosses the front of the quadriceps, connecting the front and outer sides of the thigh. During the kick, segment B1C1 applies a lateral pulling force to the front of the thigh, resisting the tendency for the thigh to rotate outward. When the swimmer's thigh does not rotate internally sufficiently, this segment tightens, generating a noticeable pulling feedback that prompts the thigh to rotate further inward, thus ensuring that the lower leg and foot rotate internally to the correct position.

[0040] Segment C1D1 (C1~D1): Extends from the lower lateral thigh to the upper lateral thigh (near the hip joint). Segment C1D1 runs longitudinally along the vastus lateralis and iliotibial band on the lateral thigh, providing support and constraint. On one hand, this segment limits excessive abduction or external rotation of the thigh, preventing it from deviating from its correct trajectory; on the other hand, it provides an inward traction path for internal rotation of the hip joint, guiding the thigh inward and towards the midline of the body.

[0041] Segment D1E1 (D1~E1): Extends from the upper lateral thigh to the side of the hip. This reinforcing fascia covers the area containing important lateral hip muscles (tensor fasciae latae and gluteus medius), making it a key segment for achieving internal hip rotation. When the swimmer begins to press down and kick, the pulling force applied to the hip by segment D1E1 directly acts on the tensor fasciae latae and gluteus medius, prompting and assisting these muscles to contract and exert force, propelling the hip joint to complete the internal rotation movement, thereby causing the thigh to rotate inward.

[0042] E1F1 segment (E1~F1): Extends from the side of the hip to the gluteal region. This segment's reinforcing tendons enter the gluteal muscle area, adhering to the posterior part of the gluteus medius and the upper part of the gluteus maximus. The function of the E1F1 segment is to continuously apply inward traction to the thigh near the buttocks, ensuring that the upper thigh maintains an internally rotated posture throughout the entire downward leg kick, preventing it from swinging outward due to changes in resistance, and ensuring a stable and consistent direction of leg force.

[0043] F1G1 segment (F1~G1): As the end of the main reinforcing rib, the F1G1 segment anchors the reinforcing rib to the center of the body torso. This segment stabilizes the overall structure of the reinforcing rib and effectively transfers the accumulated tension from the previous segments to the core of the body. At the same time, this final anchoring also ensures the stability of the swimsuit itself when the reinforcing rib applies tension, preventing displacement due to localized stress.

[0044] Preferably, the main reinforcing ribs are provided with thermoplastic elastomer films in the sections located above the medial side of the knee joint to the lower front of the thigh (such as section A1B1) and in the sections located above the lateral side of the thigh to the side of the hip (such as section D1E1); to enhance the medial traction of the knee joint and the internal rotation support of the hip joint, respectively, while the remaining sections retain their original elastic properties to ensure the continuous and flexible transmission of traction force during movement.

[0045] Specifically, the first pair of auxiliary reinforcing ligaments includes a first auxiliary reinforcing ligament 3 and a second auxiliary reinforcing ligament 4 that are symmetrical on both sides. The first auxiliary reinforcing ligament 3 and the second auxiliary reinforcing ligament 4 start from the lower edge of the buttock on the same side, extend obliquely upward along the outer side of the back of the thigh, penetrate the gluteus maximus muscle region, and form a cross support structure with the main reinforcing ligament in the gluteus medius muscle region.

[0046] It should be noted that the first pair of auxiliary reinforcing ribs runs diagonally upwards along the outer side of the back of the thigh and through the buttocks, forming a cross-support structure with the main reinforcing ribs. During the downward leg press in freestyle swimming, they provide continuous pulling force guidance and lateral stability from the thigh to the buttocks. Through cross-support, they strengthen the guidance of internal rotation of the thigh and promote the formation of internal rotation posture of the foot. They provide continuous lateral stability during the downward leg press phase, ensuring that the direction of the kick is always aligned with the longitudinal axis of the body. Together with the main reinforcing ribs, they construct a complete biomechanical guidance network, significantly improving the standardization and propulsion efficiency of the kicking motion.

[0047] In a preferred embodiment, the first auxiliary reinforcing rib 3 and the second auxiliary reinforcing rib 4 pass through the following four key points or key areas (on the same side) in sequence: A2 - lower edge of the buttock; B2 - lower lateral region of the gluteus maximus; C2 - upper region of the gluteus maximus; D2 - lateral region of the buttock.

[0048] For example, A2 (origin): located at the lower edge of the buttock, specifically at the junction of the lower edges of the adductor magnus and gluteus maximus.

[0049] For example, B2: located on the lower lateral side of the gluteus maximus, specifically at the gluteal prominence.

[0050] For example, C2: located in the upper part of the gluteus maximus, specifically in the junction area between the gluteus maximus and the gluteus medius.

[0051] For example, D2: located in the lateral region of the buttock, specifically at the upper outer edge of the belly of the gluteus medius.

[0052] It should be noted that the key points or key areas within the first pair of auxiliary reinforcing ribs work together synergistically to provide continuous pulling force and lateral stability from the thigh to the hip during the freestyle leg press, thereby improving the standardization of the leg movement and the efficiency of the kick. The functions of each section are as follows: A2B2 segment (A2~B2): Located in the buttocks, covering the lower edge of the gluteus maximus and near the groin, it provides support for hip extension during the initial phase of the freestyle leg kick and limits excessive thigh sinking.

[0053] Segment B2C2 (B2~C2): Ascends along the middle of the gluteus maximus, covering the main area of ​​the gluteus maximus. It can continuously provide traction during the downward kicking of the thigh, helping the posterior thigh muscles to exert force more effectively.

[0054] Segment C2D2 (C2~D2): Extends to the gluteus medius region, intersecting with the main reinforcing fascia at the gluteus medius location, covering the area near the gluteus medius. This segment, by creating a support point at the intersection with the main reinforcing fascia at the gluteus medius, prompts and limits thigh abduction or excessive rotation, ensuring the thigh maintains moderate internal rotation and kicks in alignment with the body's longitudinal axis.

[0055] Preferably, in the first pair of auxiliary reinforcing ribs, each auxiliary reinforcing rib is provided with a thermoplastic elastomer membrane in the section from the lower edge of the buttock to the lower lateral part of the gluteus maximus (such as segment A2B2) to enhance the support for hip joint extension in the initial stage of leg press, while the other segments (such as segments B2-C2-D2) maintain their original elastic state to ensure smooth transmission of traction force.

[0056] Specifically, the second pair of auxiliary reinforcing ligaments includes a third auxiliary reinforcing ligament 5 and a fourth auxiliary reinforcing ligament 6 that are symmetrical on both sides. The third auxiliary reinforcing ligament 5 and the fourth auxiliary reinforcing ligament 6 start from the middle region of the gracilis muscle on the same side, run obliquely upward through the posteromedial aspect of the thigh and the lower gluteal region, and form a cross support structure with the main reinforcing ligament in the gluteus medius region.

[0057] It should be noted that the second pair of auxiliary reinforcing ligaments are arranged longitudinally along the inner side of the posterior thigh, extending from the posterior thigh to below the buttocks. They form a cross-support structure with the main reinforcing ligaments, effectively constraining and guiding the flexion and extension movements of the knee and hip joints, ensuring the kicking motion follows a more linear trajectory and maintaining an appropriate leg spacing. By working in conjunction with the main reinforcing ligaments on the posterior lower limb muscles, the second pair of auxiliary reinforcing ligaments further enhances the guiding effect of internal thigh rotation, leading to a more complete internal rotation posture of the lower leg and foot, thereby significantly improving the standardization and propulsion efficiency of the kicking motion.

[0058] In a preferred embodiment, the third auxiliary reinforcing rib 5 and the fourth auxiliary reinforcing rib 6 pass through the following five key points or key areas (on the same side) in sequence: A3 - middle area of ​​the gracilis muscle; B3 - middle of the posterior thigh; C3 - posterior area of ​​the lower buttock; D3 - buttock; E3 - junction area of ​​the gluteus maximus and gluteus medius muscles.

[0059] For example, A3 (origin): located at the inner half of the thigh, specifically in the middle region of the gracilis muscle.

[0060] For example, B3: located in the middle of the back of the thigh, covering the belly of the semitendinosus muscle.

[0061] For example, C3: located in the posterior region of the lower buttocks, at the lower edge of the gluteus maximus.

[0062] For example, D3: located in the buttocks, specifically the lateral region of the gluteus maximus.

[0063] For example, E3 (endpoint): located at the junction of the gluteus maximus and gluteus medius.

[0064] It should be noted that the key points or key areas within the second pair of auxiliary reinforcing ribs work together synergistically to ensure the leg kick follows a more linear trajectory and maintains an appropriate leg spacing, thereby improving the standardization of the leg movements and the efficiency of the kick. The functions of each section are as follows: A3B3 segment (A3~B3): Originates in the middle region of the gracilis muscle on the inner thigh and is used to assist in thigh adduction.

[0065] Section B3C3 (B3~C3): Continue upwards to the upper middle part of the back of the thigh, assisting the hip to complete full extension, providing additional thrust feedback at the end of the downward kick, and applying a rebound pull to the back of the thigh during the upward kick to help the lower limb quickly return to the initial position.

[0066] Segment C3D3 (C3~D3): Enters the gluteus maximus region, reaching near the origin of the hamstrings. This segment transfers and gathers the pull of the lower hamstrings to the lower buttocks, forming a stable fulcrum near the hip joint, enhancing the stability of the leg when exerting force backward and downward.

[0067] Segment D3E3 (D3~E3): This segment terminates at the junction of the gluteus maximus and gluteus medius muscles, serving as the upper anchor point for the entire auxiliary reinforcing fascia. By anchoring itself on the lower inner side of the hip, this segment provides a clear insertion point for hip movement, prevents excessive contraction of the posterior thigh muscles, and stores elastic energy to support the leg's upward kick and return to its original position.

[0068] Preferably, in the second pair of auxiliary reinforcing ribs, each auxiliary reinforcing rib is provided with a thermoplastic elastomer film in the section from the inner thigh to the middle of the back thigh (such as section A3B3); to enhance the support and restraint of the knee joint, while the other sections retain their original elasticity to preserve elastic energy storage and rebound characteristics, ensuring smooth force feedback during movement.

[0069] For example, each tension band or each reinforcing rib of the present invention is a continuous integral structure without structural breaks.

[0070] For example, the tension band of the present invention is made of a composite structural material with high longitudinal elasticity and limited lateral extension. Longitudinal refers to the direction along the length of the tension band itself, and lateral is perpendicular to longitudinal.

[0071] For example, the tension band of the present invention is selected from nylon knitted hot melt adhesive tape with good elasticity and adhesion properties. Its structure is a multi-layer composite material, specifically including: a base material: nylon knitted fabric or nylon / polyurethane knitted fabric, providing overall elasticity and structural support; an intermediate adhesive layer: a non-thermoplastic cross-linked polyurethane base adhesive layer, used to enhance bonding strength and durability; and a surface adhesive layer: a polyurethane-based hot melt adhesive film layer, used to achieve hot-pressing lamination and positioning bonding with other fabrics.

[0072] For example, the elastic modulus of the tension band or reinforcing rib in this invention is 0.2 N / mm. 2 ~0.25N / mm 2 (e.g., 0.21 N / mm) 2 0.22N / mm 2 0.23 N / mm 2 0.24 N / mm 2 ).

[0073] Preferably, the width of the tension band or reinforcing rib described in this invention is 15~20mm (e.g., 16mm, 17mm, 18mm, 19mm).

[0074] It is understood that the combination of the tension band or reinforcing rib with the stretch fabric can be achieved using existing processes, such as hot pressing.

[0075] It should be noted that in the manufacturing process of the freestyle swimsuit of the present invention, it is crucial to ensure that a pair of main reinforcing ribs are continuously attached along a predetermined S-shaped path. If the thigh area of ​​the swimsuit uses a two-piece fabric design with front and back panels, the main reinforcing ribs should connect the front and back thigh panels without any breaks in the middle. In actual attachment work, to achieve the best attachment effect and tensile strength, the following steps are preferably followed: First, sew or glue the outer seams (such as the fifth seam 14 and the sixth seam 15) of the front and back thigh fabric panels together; then, attach the main reinforcing ribs to the inner side (reverse side) of the attached thigh fabric along a predetermined path; finally, complete the attachment of the inner seams (such as the seventh seam 16 and the eighth seam 17) of the front and back thigh fabric panels. The attachment of the main reinforcing ribs should be carried out from bottom to top, that is, starting from the starting point A1 on the inner side of the lower thigh, and sequentially attaching upwards along the path to the ending point G1 in the middle of the buttocks. During the bonding process, an appropriate longitudinal tensile force is applied to the main reinforcing rib: because the pre-cut reinforcing rib is slightly shorter than the actual circuit length (the pre-cut reinforcing rib is 3-5% shorter than the actual circuit length), after it is forcibly stretched and bonded into place, the reinforcing rib will be under continuous tensile stress. After the above process is completed, due to the material's springback effect, the main reinforcing rib will generate an additional recoil force on each segment of the thigh along the path.

[0076] Through the above design, the pulling sensation provided by the main reinforcing rib to the legs mainly comes from two aspects: firstly, the difference in elasticity of the material itself—because the elastic modulus of the reinforcing rib material is higher than that of the surrounding main fabric (for example, the elastic modulus of the reinforcing rib is 1.2 to 1.25 times that of the main stretchable fabric), swimmers can feel a significantly stronger elastic resistance from the reinforcing rib when the legs are pulled; secondly, the rebound force generated by pre-stretching during the bonding and installation—the reinforcing rib attempts to retract to its original length, continuously exerting a pulling force on the surrounding fabric. These two forces superimpose, allowing swimmers to receive clear force feedback throughout the entire range of leg movements. The pulling mechanism of other auxiliary reinforcing ribs is similar and works in conjunction with the main reinforcing rib to enhance overall stability and provide feedback on the effectiveness of leg kicking movements.

[0077] Through the aforementioned unique structural design, the freestyle swimsuit of this invention effectively guides swimmers to maintain correct leg movements. The main reinforcing ribs have higher elastic tension than the main fabric and are pre-stretched during installation to provide continuous recoil force. These characteristics ensure that the ribs constantly exert directional traction and feedback on the legs. When the swimmer performs a kicking motion, the reinforcing ribs "remind" the thighs to rotate inward and adduct, thus ensuring that the feet can fully complete internal rotation. As a result, the resistance surface generated by the legs during the kick is more directly backward, significantly improving water propulsion efficiency.

[0078] By adding auxiliary reinforcing ribs 3, 4 and 5, 6 to the back of each leg, the swimsuit of this invention achieves further technical improvements in dynamically controlling leg movements, stabilizing leg kick trajectory, and enhancing body posture consistency. Firstly, these two rear auxiliary reinforcing ribs provide higher elastic tensile strength relative to the main fabric and, together with the main reinforcing rib, form a three-dimensional traction network, effectively controlling the leg movement trajectory throughout the entire dynamic process of freestyle leg kicking. Specifically, the first auxiliary reinforcing rib 3 and the second auxiliary reinforcing rib 4 extend obliquely upwards along the posterolateral aspect of the thigh, intersecting with the main reinforcing rib to form an X-shaped support structure. This structure limits excessive hip abduction and thigh external rotation, ensuring that the leg movement always points towards the longitudinal axis of the body during downward kicking. Meanwhile, the third and fourth auxiliary reinforcing ligaments 5 and 6 are arranged longitudinally along the inner thigh, covering the main hamstring muscles and running through the knee and hip joint kinetic chains. They provide continuous elastic restraint and guidance during both the downward and upward kicking phases: during the downward kick, they enhance control over knee extension, preventing the leg from deviating from the intended trajectory due to knee laxity; during the upward kick, they assist in lifting the leg through rebound traction, ensuring smooth transitions between the two leg movements. Thus, the two auxiliary reinforcing ligaments apply beneficial dynamic control in both the vertical and horizontal directions of the freestyle kick cycle, making the leg movement amplitude and rhythm more stable and controllable. More importantly, the four auxiliary reinforcing ligaments on the posterior side work synergistically with the main reinforcing ligaments to significantly stabilize the kick trajectory and improve the consistency of body posture during swimming. On one hand, these auxiliary ligaments provide additional support and feedback to the posterior thigh; when the swimmer's kick deviates from the correct trajectory, the changes in tension in the ligaments are promptly transmitted to the skin, prompting the swimmer to correct their leg posture. On the other hand, the ribs are distributed along the posterior thigh muscles, applying moderate tightening pressure to the legs. This helps maintain the legs relatively close together and in a consistent vertical plane during the kick, preventing deviations such as crossed legs or "scissor legs." Through these effects, the swimsuit of this invention reduces unnecessary lateral leg swing and body twisting during high-speed swimming, maintaining stability along the body's longitudinal axis and improving the consistency and streamline of the swimming posture. In summary, the four auxiliary reinforcing ribs further enhance the stability and efficiency of the swimmer's leg movements: not only stabilizing the kick trajectory and reducing energy loss, but also, through collaboration with the main reinforcing ribs, comprehensively optimizing the internal rotation, extension, and recovery movements of the legs, ultimately improving the quality of the freestyle kick technique and propulsion efficiency.

[0079] This invention cleverly integrates the key techniques of freestyle leg movements into the structure of a swimsuit. When athletes are training or competing while wearing this swimsuit, if their leg movements deviate (such as insufficient internal rotation of the thigh leading to poor foot angle), the reinforcing ribs will immediately provide clear tactile feedback, prompting the athlete to correct their posture in a timely manner.

[0080] Meanwhile, this technical solution, through optimized material and structural design, assists in swimming strokes without burdening the movement. The highly elastic fabric ensures free movement of all body parts during swimming. This means that athletes can receive additional technical guidance without compromising comfort or underwater streamlinedness. In summary, the freestyle swimming garment of this invention significantly improves the standardization and efficiency of freestyle leg movements, possessing significant practical value.

[0081] This invention guides the design location of localized pressurization areas based on pressure cloud maps during freestyle swimming, and further proposes the following specific design schemes for localized pressurization areas, in conjunction with research on the characteristics of freestyle swimming posture and human anatomy: Specifically, the localized pressure area includes: a first leg pressure section 7 and a second leg pressure section 8 symmetrically arranged on both sides, the first leg pressure section 7 and the second leg pressure section 8 respectively covering the vastus lateralis muscle region on the anterolateral aspect of the ipsilateral thigh and the entire muscle group region on the posterior aspect of the thigh. Exemplarily, the boundaries of the first leg pressure section 7 and the second leg pressure section 8 reach the third joint 12, the fifth joint 14, and the seventh joint 16, respectively, or the boundaries reach the fourth joint 13, the sixth joint 15, and the eighth joint 17.

[0082] Specifically, the localized pressurized area includes a front pressurized section 9, which covers the chest, abdomen, and groin of the human body. Exemplarily, the boundary of the front pressurized section 9 extends to the first seam 10, the second seam 11, the third seam 12, and the fourth seam 13.

[0083] Specifically, the multi-layered fabric of the localized pressure area is achieved by seamlessly bonding one or more new fabrics to the reverse side of the freestyle swimsuit. The new fabric can be the same as or different from the original fabric of the area. After seamless bonding, the localized pressure area has at least two layers of fabric. For example, the localized pressure area uses a double-layered fabric; specifically, a new fabric, i.e., the inner layer, is seamlessly bonded to the reverse side of the freestyle swimsuit in the localized pressure area.

[0084] For example, the inner layer fabric is made of a material with a relatively high elastic modulus, which applies a certain amount of pressure to the core area of ​​the torso to help the body maintain a more streamlined shape. Preferably, the elastic modulus of the inner layer fabric is 0.27 N / mm². 2 ~0.32N / mm 2 (e.g., 0.28 N / mm) 2 0.29 N / mm 2 0.30 N / mm 2 0.31 N / mm 2 ).

[0085] For example, the elastic modulus of the stretch fabric described in this invention is 0.21 N / mm.2 ~0.26N / mm 2 (e.g., 0.22 N / mm) 2 0.23 N / mm 2 0.24 N / mm 2 0.25N / mm 2 ).

[0086] For example, the size of the inner fabric is smaller than the area of ​​the target area (i.e., the local pressure area) it covers; preferably, the size of the inner fabric is 95% to 98% of the area of ​​the target area it covers. During the processing stage, the inner fabric is stretched to match the actual size of the target area it covers, so that when it is fitted to the body, it will produce a local pressure effect on the core target area.

[0087] In some preferred embodiments, the elastic modulus of the freestyle swimsuit in the locally pressurized area is 1.2-1.3 times the elastic modulus of the stretch fabric itself.

[0088] It is understandable that during swimming, the interaction between the human body surface and water generates pressure drag, which is one of the main factors affecting swimming speed. Properly selecting pressurized areas for structural design can optimize body contours, reduce cross-sectional area, and make the body lines more streamlined, thereby effectively reducing pressure drag.

[0089] In some preferred embodiments, the outer fabric of the freestyle swimsuit in the locally pressurized area is a textured fabric, and the design position of the textured fabric is determined based on the surface shear stress diagram; the textured fabric is a warp-knitted fabric with a vertical stripe structure formed by jacquard technology.

[0090] For example, the periodic interval of the vertical stripes is 6-10mm (e.g., 7mm, 8mm, 9mm), preferably 8mm.

[0091] For example, the width of the vertical stripes is 1-2.5mm (e.g., 1.5mm, 2.0mm).

[0092] For example, the thickness variation of the vertical stripes does not exceed 40%-60% of the maximum thickness of the textured fabric. The thickness variation of the vertical stripes can be understood as the maximum thickness T of the vertical stripes. max T with minimum thickness min The difference.

[0093] For example, the maximum thickness of the textured fabric does not exceed 0.5-1.0 mm. The maximum thickness refers to the overall thickness of the textured fabric (including the thickness of the vertical stripes).

[0094] Specifically, the seams include a first seam 10 and a second seam 11 arranged symmetrically on both sides, and a third seam 12 and a fourth seam 13 arranged symmetrically on both sides; wherein, The upper ends of the first joint 10 and the second joint 11 respectively start from the anterior side of the axilla (on the same side), pass through the belly of the external oblique muscle, and terminate above the anterior superior iliac spine in the hip on the same side. The upper ends of the third joint 12 and the fourth joint 13 originate from the middle of the latissimus dorsi muscle on the same side of the back, and their paths extend obliquely downward, around the hip on the side of the body, and finally terminate below the anterior perineum.

[0095] Specifically, the seam includes a fifth seam 14 and a sixth seam 15 arranged symmetrically on both sides; the upper ends of the fifth seam 14 and the sixth seam 15 respectively start from the same side hip area, their paths extend obliquely downward along the anterolateral thigh, cross the lateral edge area of ​​the quadriceps femoris muscle, and the lower ends terminate on the lateral side above the knee joint.

[0096] Specifically, the seam includes a seventh seam 16 and an eighth seam 17 arranged symmetrically on the left and right. The seventh seam 16 and the eighth seam 17 start below the perineum and extend vertically downward along the midline of the inner thigh, covering an area corresponding to the belly of the gracilis muscle, and terminating at the upper edge of the inner side of the knee joint.

[0097] Specifically, the seam includes a ninth seam 18 and a tenth seam 19 arranged symmetrically on the left and right sides, with the ninth seam 18 and the tenth seam 19 located on the lower side of the scapula.

[0098] Specifically, the joint includes an eleventh joint 20 located in the T8 spinous process region.

[0099] For example, the seam can be formed by directly bonding the fabric layers together or by bonding with adhesive tape on the reverse side; for example, the adhesive tape uses a thermoplastic elastomer film as the adhesive material, and the adhesive tape achieves seamless bonding of the fabrics under heating and pressure conditions.

[0100] Preferably, the thickness of the thermoplastic elastomer film of the present invention is 0.05~0.2mm, such as 0.08mm, 0.1mm, 0.12mm, 0.15mm, or 0.18mm. The thermoplastic elastomer film satisfies at least one of the following conditions: The melt index (MI, 175℃ / 2.16kg) is 10~20 g / 10min, preferably 15~16 g / 10min; The softening point is 70~90℃, preferably 75~85℃; The rheological temperature is 155~175℃, preferably 160~170℃; The tensile force at 40% strain (e.g., for a 25.4mm wide sample) is above 4.0N, such as 4.0~5.0N; The tensile force at 100% strain (e.g., for a 25.4 mm wide sample) is above 4.5 N, such as 4.5~5.5 N; It can withstand washing at 60℃ without delamination.

[0101] It is understood that "left-right symmetry" in this invention refers to mirror symmetry about the human body's central axis. "Same side" is understood as being located to the left or right of the human body's central axis. The human body's central axis refers to the intersection of the midsagittal plane, which divides the human body into two symmetrical halves along its long axis, and the human body.

[0102] Specifically, the design location of the tension band is determined based on pressure contour maps and sports biomechanics, including: The pressure design area of ​​the freestyle swimming suit is obtained based on the pressure cloud map; Based on the design of the freestyle swimming apparel, the pressure design area, and sports biomechanics, the tension band is set in the area where the design of the freestyle swimming apparel overlaps with the pressure design area and along the muscle force path or myofascial meridian.

[0103] Specifically, the design location of the localized pressurization zone is determined based on the pressure cloud map, including: The pressure design area of ​​the freestyle swimming suit is obtained based on the pressure cloud map; Based on the pattern design of the freestyle swimming apparel and its pressure design area, the local pressure area is set in the area where the pattern design and the pressure design area of ​​the freestyle swimming apparel overlap.

[0104] For example, obtaining the pressure design area of ​​the freestyle swimsuit based on the pressure cloud map includes: identifying the high-pressure area and the low-pressure area in the pressure cloud map, and taking the low-pressure area connected to the high-pressure area as the pressure design area of ​​the swimsuit.

[0105] For example, the high-pressure region and the low-pressure region in the pressure cloud map are identified by the following method: a high-pressure threshold and a low-pressure threshold are set, and the color corresponding to the pressure value in the pressure cloud map that is greater than or equal to the high-pressure threshold is obtained according to the high-pressure threshold as the high-pressure color, and the color corresponding to the pressure value in the pressure cloud map that is less than or equal to the low-pressure threshold is obtained according to the low-pressure threshold as the low-pressure color, and the region corresponding to the high-pressure color is obtained as the high-pressure region, and the region corresponding to the low-pressure color is obtained as the low-pressure region.

[0106] It should be noted that during swimming, the human body interacts with the water. The water-blocking surface experiences positive pressure while the rear of the body experiences negative pressure, creating high-pressure and low-pressure areas on the body surface. The pressure difference between these areas results in pressure drag, which is the main factor increasing resistance. Therefore, by accurately identifying high-pressure and low-pressure areas through pressure cloud mapping, and designating the low-pressure areas connected to the high-pressure areas as the localized pressurization areas of the freestyle swimming garment in this embodiment of the invention, the areas causing pressure drag are designated as the localized pressurization areas of the freestyle swimming garment in this embodiment of the invention, thus providing a basis for effectively reducing pressure drag. For the freestyle swimming garment in this invention, attention should be paid to the pressure distribution of the pressure cloud maps of the upper and lower body.

[0107] In some embodiments, a high-elasticity modulus fabric is selected for the localized pressurized area, or one or more new fabrics are seamlessly bonded to the localized pressurized area, or both a high-elasticity modulus fabric and one or more new fabrics are seamlessly bonded to the localized pressurized area.

[0108] It should be noted that the elastic modulus of a fabric refers to how easily the fabric resists deformation. The higher the elastic modulus, the less deformation the fabric will produce when subjected to force, and swimsuits made from such fabric will exert greater pressure on the human body.

[0109] Specifically, the relationship between the pressure of a swimsuit and the elastic modulus of the fabric is as follows: P = β + α × e Where P represents the pressure of the swimsuit, β represents a constant, α represents a regression coefficient, and e represents the elastic modulus of the fabric.

[0110] Preferably, β=1.162 and α=5.156.

[0111] It should be noted that the above relationship was obtained through experiments and regression analysis. Subjects wore single-layer swimsuits of the same size and structure made of several different fabrics. The pressure of the swimsuits at several typical locations was measured using an AMI3037-10 airbag pressure tester. The above relationship was obtained through regression analysis based on the measured pressure.

[0112] Specifically, the design location of the textured fabric is determined based on the surface shear stress diagram, including: Identify high shear stress regions in the surface shear stress map where the shear stress value is greater than or equal to the high shear stress threshold, and low shear stress regions where the shear stress value is less than or equal to the low shear stress threshold; The region where the shear stress value changes significantly or decreases sharply between the high shear stress region and the low shear stress region is defined as the flow separation region. Based on the design of the freestyle swimsuit and its flow separation area, textured fabrics are used in the areas where the design and flow separation area of ​​the freestyle swimsuit overlap.

[0113] Shear stress, as we understand it, refers to the tangential stress generated on the surface of the human body due to the viscosity of the fluid as it flows over it. It is used to measure the magnitude of the frictional force generated between the fluid and the human body surface due to relative motion.

[0114] Flow separation, as we understand it, refers to the phenomenon where fluid, when flowing over a human body surface, cannot maintain a smooth flow along the surface and begins to separate from it. As fluid flows over a human body surface, under the influence of the adverse pressure gradient and surface friction, the fluid velocity gradually decreases to zero. When the fluid velocity reaches zero, it indicates that backflow occurs. In the backflow zone formed by flow separation, the fluid flows in the opposite direction to the mainstream, making the fluid motion turbulent and significantly increasing fluid resistance. Sudden changes in shear stress are a significant cause of flow separation. For example, when a fluid transitions from a high-shear stress region to a low-shear stress region, the momentum exchange efficiency decreases sharply, easily triggering flow separation. Therefore, accurately identifying flow separation regions through surface shear stress mapping provides a foundation for effectively reducing fluid resistance.

[0115] It should be noted that the textured fabric surface has a distinct microstructure. If the curvature of the human body surface is too large, the adverse pressure gradient experienced by the fluid after passing through the point of maximum velocity will be greater, making flow separation more likely. Therefore, by adding microstructures to textured fabrics, in the transition region between high and low shear stress areas, the perturbation effect of the microstructures can reintroduce some momentum into the boundary layer before the fluid stalls, causing the flow to transition to turbulence earlier. In turbulent flow, the fluid's energy exchange and mixing capabilities are stronger, better resisting the influence of the adverse pressure gradient and suppressing the formation of flow separation zones, thereby effectively reducing fluid resistance.

[0116] It should be noted that textured fabrics, due to their microstructure, have greater frictional resistance than plain-weave fabrics. Using textured fabric throughout a swimsuit may not effectively reduce drag and could even have the opposite effect. Therefore, carefully selecting which areas of the swimsuit to use textured fabric is crucial. This invention identifies flow separation areas using surface shear stress mapping and, combined with the design of the freestyle swimsuit and considering the characteristics of freestyle swimming, uses textured fabric only in areas where flow separation occurs, thereby suppressing flow separation and effectively reducing drag.

[0117] Specifically, the design area and design direction of the joint are determined based on the surface streamline diagram, including: (1) Identify the local vortex regions and local stable flow velocity regions in the surface streamline diagram; (2) The complement of the local vortex region is taken as the first region, and the intersection of the first region and the local flow velocity stable region is taken as the design region of the joint; (3) Identify the direction of the streamline of the surface streamline diagram in the seam design area of ​​the freestyle swimming garment, and take the direction of the streamline as the seam design direction of the freestyle swimming garment.

[0118] Specifically, local vortex regions in the surface streamline diagram are identified using the following method: If streamlines appear circular, annular, spiral, or rotating in a local region, then that local region is a vortex region; or, If multiple arrows intersect in a local area and the arrows have a turning direction, then that local area is also a vortex region.

[0119] It's important to note that eddies cause streamlines in surface streamline diagrams to appear circular, annular, spiral, or rotating, rather than straight or unidirectional. Therefore, areas exhibiting these streamline shapes are identified as vortex regions. The arrows on the streamlines in a surface streamline diagram indicate the direction of flow velocity. When multiple arrows converge in a region and the arrows have a turning direction, it indicates a sudden change in flow velocity or a rapid change in flow direction, thus identifying it as a vortex region. Vortex regions typically lead to uneven changes in flow velocity, forming localized eddies. Seams, as abrupt structural changes on the swimsuit surface, act as "obstacles" to fluid flow, causing changes in fluid flow at the seams, especially in vortex regions. Changes in eddies and streamlines can lead to localized flow instability, resulting in increased drag. Therefore, swimsuit seam designs should avoid being placed in localized vortex regions. Since most swimsuits are sleeveless, backless, and knee-length, when identifying localized vortex regions, depending on the swimsuit's design, it's unnecessary to focus on areas not covered by the swimsuit, such as the head, shoulders, arms, and calves.

[0120] Specifically, the local flow velocity plateau region in the surface streamline diagram is identified by the following method: if the streamlines are of uniform and moderate density and relatively straight in a certain local area, then the local area is a local flow velocity plateau region.

[0121] It's important to note that streamline density reflects fluid velocity. Areas with high streamline density (dense streamlines) indicate higher flow velocities, while areas with low streamline density (sparse streamlines) indicate lower flow velocities. Areas with uniform streamline density indicate relatively stable flow velocities. Areas with relatively straight streamlines indicate minimal directional changes in fluid flow. Therefore, the seams of swimsuits should be designed to be located in areas of stable local flow velocity. This avoids unnecessary flow disturbances in areas of excessively high velocity and prevents compromises to swimsuit comfort in areas of excessively low velocity.

[0122] Furthermore, in the seam design area of ​​the freestyle swimsuit, the streamlines of the surface streamline diagram are identified along the direction of the arrow, i.e. the direction of fluid flow, so that the seam design direction of the freestyle swimsuit is consistent with the direction of the streamlines.

[0123] It's important to note that the directionality of streamlines reflects the path and velocity direction of fluid flow. If the direction of the seam line differs significantly from the streamline direction, the fluid will encounter sudden obstacles or unnatural turns, increasing fluid disturbance and leading to localized velocity changes, flow separation, or vortex formation, thus increasing drag. Designing the seam line in the same direction as the streamlines allows for a smooth transition along the seam, maintaining stable flow. Therefore, the seam line design direction should follow the direction of the streamlines in the surface streamline diagram, i.e., the natural path of fluid flow, to minimize the impact of the seam line on fluid flow.

[0124] In one embodiment, the determination of the surface streamline diagram, pressure contour diagram, and surface shear stress diagram includes the following steps: Steps for obtaining freestyle swimming characteristic postures: Based on the analysis of freestyle swimming motion posture and dynamic drag, obtain the characteristic postures of freestyle swimming; Steps for constructing a freestyle swimming human model: Obtain a human model of the freestyle swimming characteristic posture through human body scanning; The steps for freestyle flow field simulation analysis are as follows: Perform computational fluid dynamics simulation on the human body model with the freestyle characteristic posture to obtain the surface streamline diagram, pressure cloud diagram, and surface shear stress diagram specifically for freestyle swimming.

[0125] Specifically, the steps for acquiring freestyle swimming characteristic postures include: Based on the body position, arm movements, leg movements, breathing, and complete coordination of movements in freestyle swimming, the basic posture of freestyle swimming is obtained; A dynamic drag equation was established, and the basic freestyle swimming posture was analyzed based on the dynamic drag equation to obtain the analysis results. Based on the analysis results, the postures that are consistent with the analysis results are selected from the basic postures of freestyle swimming as the characteristic postures of freestyle swimming.

[0126] Specifically, the basic freestyle swimming posture is obtained based on the body position, arm movements, leg movements, breathing, and complete coordination of these movements, as described below: (1) Body position Horizontal position: Lie face down on the water and keep your body horizontal, with your head and torso in a straight line; Slightly prone position: Maintain a slightly prone position with the body's longitudinal axis forming an angle of attack of 30° to 50° with the water surface, head slightly downward, eyes looking downward and slightly forward; Body rotation: When swimming in the water, the body can rotate rhythmically around its longitudinal axis, with a rotation range of 35° to 45°. When the body rotates, one shoulder will break the surface of the water. (2) Arm movements Entry into the water: fingers naturally straight and together, palm facing the side and downward, elbow slightly bent and higher than the hand, thumb enters the water first, the order of the entire arm entering the water is palm, forearm, upper arm; Catch: After the arm enters the water, the forearm and upper arm immediately externally rotate, accompanied by wrist and elbow flexion. The catch ends when the arm and the water surface form a 40° angle. Pulling: The arms are positioned below the shoulders and move backward and downward, with the palm and forearm forming a plane to catch the water; Pushing the water: Continue to move your arms backward and downward, bringing your elbows closer to your sides, and push the water backward with your palms and forearms; Emerging from the water: Use the contraction of the deltoid muscle to move the arm out of the water. The order of emerging from the water is: shoulder, upper arm, forearm, and hand. Aerial arm movement: The arm moves forward in the air with the shoulder as the axis; (3) Leg movements Kick upwards: Using the hip, knee, and ankle as the pivot points, generate power from the waist, and use the thighs to drive the lower legs and feet to kick the water upwards. Relax while kicking upwards. Kick downwards: Using the hip, knee, and ankle as the pivot points, generate power from the waist, and use the thighs to drive the lower legs and feet to kick downwards. Apply force when kicking downwards. (4) Breathing Side-turn inhalation: During the stroke, rotate your body to the left / right and turn your head to the left / right to inhale; Exhale: Exhale as you turn your head back into the water; (5) Complete coordination of movements While maintaining a horizontal position in the water, the body rotation should be coordinated with the arm strokes, leg kicks, and breathing to form a continuous movement. In a complete movement cycle, the general technique is to kick the legs three times, stroke the arms once, and breathe once, which is called the 6-2-1 coordination pattern. In addition, there are also 4-2-1 and 2-2-1 coordination patterns. Different coordination patterns can be adopted according to individual characteristics.

[0127] Furthermore, the expression for the dynamic resistance equation is: , in, Indicates dynamic resistance. Indicates frictional resistance. Indicates shape resistance, Indicates wave resistance. Indicates the viscosity coefficient. Represents the gradient of swimming speed. Represents the area of ​​fluid distribution. Indicates the drag coefficient. This indicates the density of water. This represents the cross-sectional area of ​​the human body facing water. Indicates swimming speed, Indicates the amplitude of the wave. Indicates the length of the wave. Indicates the angle between the direction of swimming and the wavefront. Indicates a unit of time.

[0128] Specifically, the resistance a person experiences while swimming forward in water is called dynamic resistance. Dynamic resistance includes: frictional resistance, form resistance (also known as pressure drag), and wave resistance. Frictional resistance refers to the resistance generated when water around a person flows along the contours of the body in the opposite direction of movement as the person swims forward. Form resistance refers to the pressure difference created by the body pushing water forward, causing water layer movement and redistribution of pressure. In front of the person, the pressure on the water-blocking surface increases due to the pushing motion, creating positive pressure. Behind the person, the pressure tends to separate from the original water layer, creating negative pressure. Wave resistance refers to the resistance generated by the movement of water near the surface, causing water layer movement and pressure redistribution. The water layer moves along the person's movement path from high-pressure areas to low-pressure areas, creating waves.

[0129] It's important to note that wave drag is primarily related to body shape, swimming style, swimming speed, and water density, and is almost impossible to improve through swimsuit design. On one hand, the interaction between the body surface and water creates high-pressure and low-pressure areas. The pressure difference between these areas generates pressure drag (i.e., shape drag), which is the main factor increasing drag. On the other hand, seams can affect the boundary layer state and the location of flow separation points, further increasing pressure drag. Proper fabric placement, pressure band design, and seam design can effectively reduce shape drag. Therefore, analyzing the basic posture of each swimming style based on shape drag provides a foundation for improving swimsuit design.

[0130] Furthermore, the analysis results include: selecting the posture corresponding to the higher speed as the feature posture.

[0131] Specifically, the characteristic posture of freestyle swimming includes: the body position is horizontal, one arm is pushing water, the other arm is entering the water, the leg on the same side as the arm pushing water is kicking water downwards, and the other leg is kicking water upwards.

[0132] Specifically, the steps for constructing the freestyle swimming human model include: A scanning imager was used to scan the human body in the characteristic freestyle swimming posture; a human body model of the characteristic freestyle swimming posture was constructed based on the scanning results.

[0133] Preferably, a professional athlete assumes the characteristic posture of freestyle swimming, and the athlete is scanned using an F6 SMART handheld 3D scanning imager. The original scan result file is then input into the human body model construction module based on ECHO model processing software to obtain a human body model of the characteristic posture of freestyle swimming.

[0134] Specifically, the steps for freestyle flow field simulation analysis include: The computational domain is set according to the human body model; The computational domain and the human body model are meshed; By setting the calculation parameters, computational fluid dynamics simulation is performed on the meshed human body model within the computational domain to obtain the surface streamline diagram, pressure cloud diagram, and surface shear stress diagram of the human body model.

[0135] Specifically, setting the computational domain based on the human body model includes: setting the geometric model size of the computational domain, the distances from the human body model to the upstream, downstream, upper, lower, left, and right boundaries of the computational domain, and the entrance boundary conditions, exit boundary conditions, and wall boundary conditions of the computational domain; wherein, the computational domain is a cube, the geometric model size of the computational domain includes the length, width, and height of the computational domain, and the human body model is located inside the computational domain.

[0136] Preferably, the length, width, and height of the computational domain are set to 22.56m, 6.41m, and 6.32m, respectively; the distances from the human body model to the upstream, downstream, upper, lower, left, and right boundaries of the computational domain are set to 5m, 15m, 3m, 3m, 3m, and 3m, respectively. The inlet boundary condition of the fluid domain is set to a velocity inlet with a velocity of 1.5m / s and a flow Reynolds number Re of approximately 6.01×10⁵; the outlet boundary condition is set to a pressure outlet, ignoring shallow water pressure, and applying an ambient static pressure of 1 atmosphere at the outlet; the wall boundary conditions of the four surfaces of the fluid domain (upper, lower, left, and right) are all set to symmetric plane boundary conditions, and the fluid is water with a density of 998.2kg / m³.

[0137] It's important to note that Computational Fluid Dynamics (CFD) is a field that uses numerical simulation methods and computer technology to study fluid motion and interactions. CFD discretizes the fluid dynamics equations into a series of mathematical equations, then uses a computer to numerically solve them to simulate and analyze the fluid's motion, pressure, temperature, and other characteristics. The computational domain refers to the entire spatial region used to calculate fluid flow and related physical phenomena in a CFD simulation. The boundary of the computational domain defines the range of fluid flow and includes inlet boundary conditions, outlet boundary conditions, and wall boundary conditions. The fluid domain refers to the region within the computational domain that actually contains the fluid. Inlet boundary conditions are the physical conditions applied at the inlet of the fluid domain, outlet boundary conditions are the physical conditions applied at the outlet of the fluid domain, and wall boundary conditions are the physical conditions applied at the boundary where the fluid domain contacts the wall. The upstream boundary is the boundary where the fluid enters the computational domain in the direction of fluid flow; the downstream boundary is the boundary where the fluid exits the computational domain in the direction of fluid flow. The upstream boundary is usually set as the fluid inlet boundary condition, the downstream boundary is usually set as the fluid outlet boundary condition, and the left and right boundaries as well as the top and bottom boundaries are usually set as the fluid wall boundary conditions.

[0138] Specifically, the meshing of the computational domain and the human body model includes: Set the maximum and minimum size of the surface mesh; Set the type of volume mesh and its maximum and minimum sizes; Set the size of several locally encrypted influence bodies; Set the thickness of the first layer of the expansion layer mesh, the growth factor, and the number of expansion layers; The computational domain and the human body model are meshed according to the above settings.

[0139] Preferably, the computational domain and the human body model are meshed using the pre-processing software ANSYS Fluent Meshing. The maximum and minimum dimensions of the surface mesh are set to 200 mm and 1 mm, respectively; the volume mesh type is set to Poly-hexcore volume mesh, with maximum and minimum dimensions of 1000 mm and 1 mm, respectively; the dimensions of the three local refinement influence volumes are set to 10 mm, 20 mm, and 40 mm, respectively; the thickness of the first layer of the expansion layer mesh is set to 0.01 mm, the growth factor to 1.2, and the number of expansion layers to 15. Meshing the computational domain and each human body model according to the above settings yields approximately 20 million meshes for each human body model.

[0140] It should be noted that the localized mesh refinement effect is used to refine the mesh in a specific region without additionally dividing the computational domain, thereby improving the accuracy of the simulation. The expanded layer mesh is used to generate a high-resolution mesh near the wall boundary of the fluid domain to better capture the flow characteristics within the boundary layer. The thickness of the first layer of the expanded layer mesh refers to the thickness of the first layer of mesh cells generated near the wall boundary; the expansion factor of the expanded layer mesh refers to the ratio of the thicknesses of two adjacent layers of mesh cells in the expanded layer; and the number of expanded layers refers to the number of expanded layer mesh layers generated near the wall boundary.

[0141] Furthermore, the setting of calculation parameters and the performance of computational fluid dynamics simulation on the meshed human body model within the computational domain to obtain the surface streamline diagram, pressure contour diagram, and surface shear stress diagram of the human body model include: Select the solver and numerical solution method, and set the corresponding calculation parameters; Based on the solver and numerical solution method, the simulation results are obtained by performing computational fluid dynamics simulation on the meshed human body model in the computational domain using simulation software. Post-processing of the simulation results yields surface streamline diagrams, pressure cloud diagrams, and surface shear stress diagrams of the human body model.

[0142] Specifically, the selection of the solver and numerical solution method, and the setting of the corresponding calculation parameters, include: selecting a turbulence model solver based on the characteristics of the fluid surrounding a person swimming, wherein the SST k-ω turbulence model is used to close the Reynolds-averaged equations to obtain the governing equations; using the finite volume method to discretize the governing equations, wherein a second-order scheme is used to spatially discretize the spatial derivatives to reduce numerical discretization errors caused by mesh misalignment; selecting a pressure-velocity coupled solution method and using the SIMPLE algorithm to solve the problem to achieve better convergence performance; monitoring the total resistance and residual curve of the human body, while keeping the other settings at default.

[0143] It should be noted that the fluid surrounding a person while swimming is incompressible. The flow of the fluid around the person and swimming equipment is described by solving the Navier-Stokes (NS) equations. The Navier-Stokes (NS) equations include the continuity equation and the momentum equation. The expression for the continuity equation is shown below: Continuity equation: , in, For fluid density, This represents the Reynolds-mean velocity component with the mean sign omitted. Spatial coordinates; The expression for the momentum equation is shown below: , in, This refers to fluid pressure. , This represents the Reynolds-mean velocity component with the mean sign omitted. , For turbulent fluctuation velocity, These are the components of the Reynolds stress tensor. These are spatial coordinates.

[0144] Turbulence is an irregular flow phenomenon that occurs at high Reynolds numbers. Turbulence is often simulated numerically, with turbulence models serving as mathematical relationships for calculating Reynolds stress, forming a closed system of equations together with the Navier-Stokes equations. The standard Shear-Stress Transport (SST) k-ω turbulence model is the only turbulence model that truly captures vortices. The SST k-ω turbulence model is a two-equation hybrid model. It uses the Wilcox k-ω model in the near-wall boundary region and the k-ω model at the boundary layer edge and free shear layer, with a mixing function acting as a transition. It belongs to the two-equation eddy viscosity mode of incompressible / compressible turbulence integrated to the wall, thus providing a more accurate analysis of the flow field around the human body and the distribution of surface pressure. Therefore, the SST k-ω turbulence model is used to numerically calculate the flow field of human models corresponding to different swimming postures.

[0145] Specifically, based on the aforementioned solver and numerical solution method, the human body model after meshing is simulated in the computational domain in the simulation software. The simulation time step and total time are set as needed. During the simulation, the changes in the total resistance of the human body and the residual curve are monitored to ensure simulation convergence and obtain simulation results.

[0146] Specifically, the post-processing of the simulation results to obtain the surface streamline diagram, pressure cloud diagram, and surface shear stress diagram of the human body model includes: extracting velocity field data of the human body model surface from the simulation results, and generating the surface streamline diagram of the human body model based on the extracted velocity field data; extracting pressure data of the human body model surface from the simulation results, and generating the pressure cloud diagram of the human body model based on the extracted pressure data; and extracting wall shear stress data of the human body model surface from the simulation results, and generating the surface shear stress diagram of the human body model based on the extracted wall shear stress data.

[0147] It should be noted that surface streamline diagrams are visualization tools that use curves to show changes in fluid velocity and direction on the human body surface; these curves, called streamlines, are drawn along the tangent direction of the fluid velocity vector, and can intuitively show the dynamic behavior of fluid on the human body surface. Pressure cloud diagrams are visualization tools that use different colored areas to show the pressure distribution on the human body surface; the first color represents the highest pressure, the second color represents the lowest pressure, and several transition colors are set between the first and second colors. The first color, the second color, and the transition colors between the first and second colors are the colors corresponding to the pressure cloud diagram. The color of each area in the pressure cloud diagram can be represented by its corresponding color; the closer to the first color, the higher the pressure, and the closer to the second color, the lower the pressure, which can intuitively show the location of high-pressure and low-pressure areas on the human body surface. Similarly, a surface shear stress map is a visualization tool that uses different colors to show the distribution of shear stress on the human body surface. The third color represents the highest shear stress, the fourth color represents the lowest shear stress, and several transition colors are set between the third and fourth colors. The third color, the fourth color, and the transition colors between the third and fourth colors then correspond to the colors in the surface shear stress map. The color of each region in the surface shear stress map can be represented by its corresponding color; the closer to the third color, the higher the shear stress, and the closer to the fourth color, the lower the shear stress. This visually shows the location of high and low shear stress areas on the human body surface. The first and third colors can be the same color, and the second and fourth colors can also be the same color.

[0148] For example, if red is selected to represent the highest pressure and blue to represent the lowest pressure, and 18 transition colors are set between red and blue, then the color of each region in the pressure cloud map can be represented by the above 20 colors; the closer to red, the higher the pressure, and the closer to blue, the lower the pressure.

[0149] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and comparative examples.

[0150] Example 1: This embodiment provides a freestyle swimsuit that prompts leg technique postures. It is made of stretchable fabric, which covers the area from the neck to the knees when worn, with the side closest to the skin being the reverse side. The freestyle swimming suit includes tension bands, localized pressure zones, and seams; The tension band is fixedly installed on the reverse side of the freestyle swimming garment. The design position of the tension band is determined based on the pressure cloud map and sports biomechanics. The tension band includes two main reinforcing ribs that are symmetrical on both sides, and two pairs of auxiliary reinforcing ribs that are symmetrical on both sides. The main reinforcing fascia extends from the medial side of the knee joint on the same side in an S-shaped path to the thoracolumbar fascia region; each of the first pair of auxiliary reinforcing fascia starts from the lower part of the buttock on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a first intersection point; each of the second pair of auxiliary reinforcing fascia starts from the upper 1 / 2 region of the medial side of the thigh on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a second intersection point; wherein, the second intersection point is further away from the midline of the human body than the first intersection point on the same side; The localized pressurization area uses multi-layered fabric, and the design location of the localized pressurization area is determined based on the pressure cloud map; The design area and design direction of the joint are determined based on the surface streamline diagram.

[0151] The pressure cloud map and surface streamline map in this embodiment are obtained through the steps in the specific implementation method. See [link to specific implementation method]. Figures 9 to 11 .

[0152] Specifically, the design location of the tension band is determined based on pressure contour maps and biomechanics, including: (1) Based on the pressure cloud map ( Figure 9 The pressurized design area of ​​the freestyle swimming suit is obtained; (2) Based on the pattern design of the freestyle swimming garment, the pressure design area and sports biomechanics, the tension band is set in the area where the pattern of the freestyle swimming garment overlaps with the pressure design area and on the path of human muscle force exertion or myofascial meridian. Among them, according to the pressure cloud map ( Figure 9 The process of obtaining the pressure design area of ​​the freestyle swimsuit includes: identifying the high-pressure area and the low-pressure area in the pressure cloud map, and taking the low-pressure area connected to the high-pressure area as the pressure design area of ​​the swimsuit.

[0153] Specifically, the high-pressure and low-pressure regions in the pressure cloud map are identified by the following method: a high-pressure threshold and a low-pressure threshold are set. Based on the high-pressure threshold, the color corresponding to the pressure value in the pressure cloud map that is greater than or equal to the high-pressure threshold is used as the high-pressure color. Based on the low-pressure threshold, the color corresponding to the pressure value in the pressure cloud map that is less than or equal to the low-pressure threshold is used as the low-pressure color. The region corresponding to the high-pressure color is used as the high-pressure region (positive pressure), and the region corresponding to the low-pressure color is used as the low-pressure region (negative pressure).

[0154] Based on pressure cloud map ( Figure 9 Based on the guidance of [unclear], and combined with research on the characteristics of freestyle swimming posture and human anatomy, this embodiment has a total of 6 tension bands: like Figures 1-7In this embodiment, the six tension bands are: a first main reinforcing rib 1 and a second main reinforcing rib 2 that are symmetrically arranged on both sides; a first auxiliary reinforcing rib 3 and a second auxiliary reinforcing rib 4 that are symmetrically arranged on both sides; and a third auxiliary reinforcing rib 5 and a fourth auxiliary reinforcing rib 6 that are symmetrically arranged on both sides. The first main reinforcing rib 1 and the second main reinforcing rib 2 pass through the following seven key points or key areas (on the same side): A1 - Attachment area of ​​the medial collateral ligament and femoral muscle of the knee joint; B1 - Quadriceps tendon region of the lower anterior thigh; C1 - Middle and lower part of the vastus lateralis of the lower lateral thigh; D1 - Region of the lateral thigh adjacent to the hip joint and the tensor fasciae latae of the upper lateral thigh; E1 - Lateral region of the gluteus medius muscle belly on the lateral side of the hip; F1 - Upper region of the buttock; G1 - Midline region of the thoracolumbar fascia.

[0155] The first auxiliary reinforcing ligament 3 and the second auxiliary reinforcing ligament 4 pass through the following four key points or key areas (on the same side): A2 - lower edge of the buttock; B2 - lower lateral region of the gluteus maximus; C2 - upper region of the gluteus maximus; D2 - lateral region of the buttock. The third auxiliary reinforcing ligament 5 and the fourth auxiliary reinforcing ligament 6 pass through the following five key points or key areas (on the same side) in sequence: A3 - middle area of ​​the gracilis muscle; B3 - middle of the back of the thigh; C3 - posterior area of ​​the lower buttock; D3 - buttock; E3 - junction area of ​​the gluteus maximus and gluteus medius muscles.

[0156] Specifically, the design location of the localized pressurization zone is determined based on the pressure cloud map, including: (1) Obtain the pressure design area of ​​the freestyle swimming garment based on the pressure cloud map; (2) Based on the pattern design of the freestyle swimsuit and its pressure design area, the local pressure area is set in the area where the pattern design and the pressure design area of ​​the freestyle swimsuit overlap.

[0157] Based on the design location of localized pressurization zones guided by pressure cloud maps during freestyle swimming, and combined with research on the characteristics of freestyle swimming posture and human anatomy, the localized pressurization zones in this embodiment employ a double-layer fabric structure with low elongation along the body length direction. Figures 1-7 The localized pressure areas are a first leg pressure section 7 and a second leg pressure section 8, symmetrically arranged on both sides, and a front body pressure section 9. The first leg pressure section 7 and the second leg pressure section 8 respectively cover the vastus lateralis muscle region on the anterolateral aspect of the same side thigh and the entire muscle group region on the posterior aspect of the thigh, with boundaries reaching the third seam 12, the fifth seam 14, and the seventh seam 16, or the fourth seam 13, the sixth seam 15, and the eighth seam 17. The front body pressure section 9 covers the chest, abdomen, and groin area, with boundaries reaching the first seam 10, the second seam 11, the third seam 12, and the fourth seam 13.

[0158] Specifically, the design area and design direction of the joint are determined based on the surface streamline diagram, including: (1) Identify the surface streamline diagram ( Figure 10 and Figure 11 The local vortex region and the local stable flow velocity region in the flow; (2) The complement of the local vortex region is taken as the first region, and the intersection of the first region and the local flow velocity stable region is taken as the design region of the joint; (3) Identify the direction of the streamline of the surface streamline diagram in the seam design area of ​​the freestyle swimming garment, and take the direction of the streamline as the seam design direction of the freestyle swimming garment.

[0159] Based on the design area and direction of the seams guided by the surface streamline diagram of the freestyle swimming posture, and combined with the study of the characteristics of the freestyle swimming posture and the human anatomical structure, this embodiment has a total of 11 seams, namely: The first joint 10 and the second joint 11 are symmetrical on both sides: their upper ends start from the anterior side of the axilla (on the same side), pass through the belly of the external oblique muscle, and their lower ends terminate above the anterior superior iliac spine in the hip on the same side. The third joint 12 and the fourth joint 13 are symmetrical on both sides: their upper ends start from the middle of the latissimus dorsi muscle on the same side of the back, their paths extend obliquely downward, around the hip on the side of the body, and their lower ends finally terminate below the perineum on the front side.

[0160] The fifth joint 14 and the sixth joint 15 are symmetrical on both sides: their upper ends start in the same side hip area, their paths extend obliquely downward along the anterolateral thigh, cross the lateral edge area of ​​the quadriceps femoris muscle, and their lower ends terminate on the lateral side above the knee joint.

[0161] The symmetrical seventh and eighth joints 16 and 17: respectively, start below the perineum, extend vertically downward along the midline of the inner thigh, cover an area corresponding to the belly of the gracilis muscle, and terminate at the upper edge of the inner side of the knee joint.

[0162] The ninth and tenth joints 18 and 19 are symmetrically arranged on the left and right sides, respectively located on the lower side of the scapula.

[0163] Eleventh joint 20: Located in the T8 spinous process region.

[0164] The seam is formed by an adhesive tape, which is a thermoplastic elastomer film.

[0165] Example 2: The freestyle swimsuit provided in this embodiment is the same as that in Embodiment 1, except that: in this embodiment, thermoplastic elastomer films are respectively provided in the A1B1 and D1E1 sections of the first main reinforcing rib 1 and the second main reinforcing rib 2; thermoplastic elastomer films are respectively provided in the A2B2 section of the first auxiliary reinforcing rib 3 and the second auxiliary reinforcing rib 4, and in the A3B3 section of the third auxiliary reinforcing rib 5 and the fourth auxiliary reinforcing rib 6.

[0166] Example 3: The freestyle swimsuit provided in this embodiment is the same as that in embodiment 2, except that: the outer layer of the first leg compression part 7 and the second leg compression part 8 in this embodiment is made of textured fabric; the textured fabric is a warp-knitted fabric with a vertical stripe structure formed by jacquard process; the period interval of the vertical stripes is 8mm; the width of the vertical stripes is 1.5mm; the thickness variation of the vertical stripes does not exceed 60% of the maximum thickness of the textured fabric; and the maximum thickness of the textured fabric is 1.0mm.

[0167] In the above embodiments, the stretch fabric used for the main body of the freestyle swimming apparel is made of 72% nylon and 28% spandex, and it is purchased from Maniafatture Italiane Scudieri SRL with the following basic parameters: thickness 0.3mm, elastic modulus 0.23N / mm². 2 123g / m 2 Both the warp and weft elasticity are 55%.

[0168] The tension band / reinforcing rib in the above embodiments is a nylon knitted hot melt adhesive tape, which was purchased from San Chemicals Ltd. and has the following basic parameters: thickness 0.8mm, width 20mm, elastic modulus 0.25N / mm². 2 Weight: 275g ± 5% per meter. The nylon knitted hot melt adhesive tape has a multi-layer composite structure, in which the base material is nylon knitted fabric, the middle adhesive layer is a non-thermoplastic cross-linked polyurethane base layer, and the surface adhesive layer is a polyurethane-based hot melt adhesive film layer.

[0169] The thermoplastic elastomer film in the above embodiments was purchased from SAN FANG CHEMICAL INDUSTRY CO.,LTD (e.g., brand name LSCHYS-WO31) and its basic parameters are as follows: thickness of 0.1 mm, melt index (MI, 175℃ / 2.16 kg) of 15.5 g / 10 min; softening point of 75~85℃; rheological temperature of 160~170℃; tensile force at 40% strain (e.g., 25.4 mm wide sample) of 4.0~5.0 N; tensile force at 100% strain (e.g., 25.4 mm wide sample) of 4.5~5.5 N; and can withstand washing at 60℃ without delamination.

[0170] In the above embodiments, the inner layer fabric of the locally pressurized area is 75% nylon and 25% spandex, purchased from Maniafatture Italiane Scudieri SRL, and its basic parameters are as follows: thickness 0.5mm, elastic modulus 0.3N / mm². 2 163g / m 2 The warp elasticity is 60% and the weft elasticity is 70%; the inner fabric size is 98% of the target area to be covered, and it is stretched to the actual target area size during the processing and manufacturing stage.

[0171] Comparative Example The shape and size of the freestyle swimsuit in this comparative example are the same as those in Example 1, and the overall fabric and seam settings are the same as those in Example 1. However, this comparative example does not have tension bands or local pressure areas.

[0172] To evaluate the performance of the swimsuits, this invention employs a randomized crossover design: 8-12 professional freestyle swimmers of similar skill levels are selected and tested in a standard 50-meter pool (water temperature 26±1℃) wearing both the embodiment and the comparative swimsuits. The tests must adhere to a double-blind principle (neither the athletes nor the evaluators know their group assignments). Underwater motion capture systems are used to record biomechanical parameters such as leg kick angles and joint trajectories. A current meter is used to measure propulsive efficiency, and the 25-meter sprint time is recorded. A 48-hour washout period is maintained between each test group. All data are statistically analyzed using analysis of variance to objectively quantify the differences between the various embodiments in terms of motion standardization, propulsive efficiency, and drag reduction performance.

[0173] Based on the results of various tests, compared with the comparative example, athletes wearing the freestyle swimming suits of the embodiments showed significant improvements in the standardization and consistency of their leg kicking movements, effectively increasing kicking efficiency while maintaining good drag reduction, flexibility, and support performance. Embodiments 2 and 3, building upon Embodiment 1, demonstrated further improvements in prompting and correcting leg technique movements, increasing kicking efficiency, and enhancing drag reduction performance.

[0174] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A freestyle swimming garment that prompts leg technique posture, characterized in that, Made of stretch fabric, when worn by the human body, the stretch fabric covers from the neck to the knees, with the side closest to the skin being the reverse side; The freestyle swimming suit includes tension bands, localized pressure zones, and seams; The tension band is fixedly installed on the reverse side of the freestyle swimming garment. The design position of the tension band is determined based on the pressure cloud map and sports biomechanics. The tension band includes two main reinforcing ribs that are symmetrical on both sides, and two pairs of auxiliary reinforcing ribs that are symmetrical on both sides. The main reinforcing fascia extends from the medial side of the knee joint on the same side in an S-shaped path to the thoracolumbar fascia region; each of the first pair of auxiliary reinforcing fascia starts from the lower part of the buttock on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a first intersection point; each of the second pair of auxiliary reinforcing fascia starts from the upper 1 / 2 region of the medial side of the thigh on the same side, extends obliquely upward and intersects with the main reinforcing fascia to form a second intersection point; wherein, the second intersection point is further away from the midline of the human body than the first intersection point on the same side; The localized pressurization area uses multi-layered fabric, and the design location of the localized pressurization area is determined based on the pressure cloud map; The design area and design direction of the joint are determined based on the surface streamline diagram.

2. The freestyle swimming attire according to claim 1, characterized in that, The main reinforcing fascia originates above the medial side of the knee joint and extends obliquely upward in an S-shaped path: it transitions from the front of the thigh to the lateral side of the thigh, ascends along the iliotibial band, crosses the gluteus medius region, and terminates in the thoracolumbar fascia region on the posterior side of the body.

3. The freestyle swimming attire according to claim 1, characterized in that, The first pair of auxiliary reinforcing ligaments includes a first auxiliary reinforcing ligament (3) and a second auxiliary reinforcing ligament (4) that are symmetrical on both sides. The first auxiliary reinforcing ligament (3) and the second auxiliary reinforcing ligament (4) start from the lower edge of the buttocks, extend obliquely upward along the outer side of the back of the thigh, penetrate the gluteus maximus region, and form a cross support structure with the main reinforcing ligament in the gluteus medius region.

4. The freestyle swimming garment according to claim 1, characterized in that, The second pair of auxiliary reinforcing ligaments includes a third auxiliary reinforcing ligament (5) and a fourth auxiliary reinforcing ligament (6) that are symmetrical on both sides. The third auxiliary reinforcing ligament (5) and the fourth auxiliary reinforcing ligament (6) start from the middle region of the gracilis muscle, run obliquely upward through the inner side of the back of the thigh and the lower buttock region, and form a cross support structure with the main reinforcing ligament in the gluteus medius region.

5. The freestyle swimming garment according to claim 1, characterized in that, The local pressure area includes a first leg pressure area (7) and a second leg pressure area (8) arranged symmetrically on the left and right sides. The first leg pressure area (7) and the second leg pressure area (8) respectively cover the vastus lateralis muscle area on the front and outer side of the same side thigh and the entire muscle group area on the back side of the thigh.

6. The freestyle swimming attire according to claim 1, characterized in that, The localized pressurized area includes: a front pressurized part (9), which covers the chest, abdomen and groin of the human body.

7. The freestyle swimming attire according to claim 1, characterized in that, The joints include a first joint (10) and a second joint (11) arranged symmetrically on the left and right, and a third joint (12) and a fourth joint (13) arranged symmetrically on the left and right; wherein, The upper ends of the first joint (10) and the second joint (11) start from the anterior side of the axilla, pass through the belly of the external oblique muscle, and terminate above the anterior superior iliac spine of the ipsilateral hip. The upper ends of the third joint (12) and the fourth joint (13) start from the middle of the latissimus dorsi muscle on the same side of the back, and extend downward obliquely, passing around the hip on the side of the body, and finally end below the anterior perineum.

8. The freestyle swimming attire according to claim 1, characterized in that, The seam includes a fifth seam (14) and a sixth seam (15) arranged symmetrically on the left and right sides; the upper ends of the fifth seam (14) and the sixth seam (15) respectively start from the same side hip area, their paths extend obliquely downward along the anterolateral thigh, cross the lateral edge area of ​​the quadriceps femoris muscle, and the lower ends terminate on the lateral side above the knee joint.

9. The freestyle swimming garment according to claim 1, characterized in that, The main reinforcing ribs are provided with thermoplastic elastomer films in the sections located above the medial side of the knee joint to the lower anterior thigh and in the sections located above the lateral thigh to the hip side; and / or, In the first pair of auxiliary reinforcing ribs, each auxiliary reinforcing rib has a thermoplastic elastomer membrane disposed in the section from the lower edge of the buttock to the lower lateral part of the gluteus maximus muscle; and / or, In the second pair of auxiliary reinforcing ribs, each auxiliary reinforcing rib is provided with a thermoplastic elastomer film in the section from the inner thigh to the lower middle part of the back thigh; The thermoplastic elastomer film is located between the tension band and the stretch fabric.

10. The freestyle swimming garment according to claim 1, characterized in that, The outer layer of the freestyle swimsuit in the locally pressurized area is a textured fabric, and the design position of the textured fabric is determined based on the surface shear stress diagram; the textured fabric is a warp-knitted fabric with a vertical stripe structure formed by jacquard process.

Images