Foot sole attachment

Abstract

To provide a sole mounting body which can be used as an insole and a sandal.SOLUTION: The sole attachment body 30 includes a sole body 11 on which the sole is placed, and a first projection 13 projecting from the sole body 11 to the sole side, and the first projection 13 centrally supports the central part 51c of the first metatarsal 51. The sole attachment body 30 may include a second protrusion 15 and a third protrusion 17 protruding from the sole body 11 toward the sole side. In this case, the second convex portion 15 centrally supports the navicular bone 55, and the third convex portion 17 centrally supports the cuboid bone 57.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a footwear that can be used as an insole, a sandal, or the like. [Background technology]

[0002] The sole attachment has a specific shape to exert some effect on the sole of the foot. The sole attachment can be inserted into a shoe to be used as an insole, or the sole attachment with a specific shape can be worn as a sandal or slipper.

[0003] For example, Patent Document 1 (Patent No. 6966078) discloses a foot orthotic used as the midsole of footwear or as an insole inserted into footwear, which has a first protruding portion that protrudes to press against the ball of the big toe, a second protruding portion that protrudes to press against the ball of the little toe, and a base portion on which the first protruding portion and the second protruding portion are arranged, and which is characterized in that the first protruding portion presses against the ball of the big toe and the second protruding portion presses against the ball of the little toe, allowing the foot orthotic to walk with the toes raised higher than the heel.

[0004] With this foot orthotic, when walking, the first protrusion presses against the ball of the big toe, and the second protrusion presses against the ball of the little toe, thereby properly maintaining the arch of the foot, thereby eliminating the difficulty in walking caused by the collapse of the arch. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6966078 Summary of the Invention [Problem to be solved by the invention]

[0006] However, although Patent Document 1 allows walking with the toes raised higher than the heels, the higher toes cause the center of gravity to shift from the toes to the heels. As a result, wearing this insole and leaning forward causes excessive tension in the foot muscles.

[0007] An object of the present invention is to provide a sole mounting body that can reduce the burden on the wearer even when in a forward leaning position. [Means for solving the problem]

[0008] The inventors of the present invention discovered that by using a sole body having a convex portion that centrally supports the center of the first metatarsal, the convex portion can alleviate muscle activity when in a forward-leaning posture. Furthermore, the inventors of the present invention have discovered that in a preferred embodiment, by combining a first convex portion that centrally supports the center of the first metatarsal bone, a second convex portion that centrally supports the cuboid bone, and a third convex portion that centrally supports the navicular bone, it is possible not only to alleviate muscle activity in a forward-leaning posture, but also to reduce fluctuations in the center of gravity in the front-to-back and left-to-right directions in an upright posture.

[0009] The present invention may include the following aspects. [Aspect 1] The sole body on which the sole of the foot rests, a first protrusion protruding from the sole body toward the sole side, The first protrusion is a sole attachment that centrally supports the center of the first metatarsal bone. [Aspect 2] The sole wearing body according to aspect 1, wherein the center of the first metatarsal bone is pressed more strongly than the second proximal phalanx. [Aspect 3] The sole attachment described in aspect 1 further includes a second convex portion and a third convex portion protruding from the sole body toward the sole of the foot, the second convex portion supporting the navicular bone at its center, and the third convex portion supporting the cuboid bone at its center. [Aspect 4] The sole wearing body according to aspect 3, wherein the second convex portion and the third convex portion are connected via a valley portion, and the valley portion existing between the second convex portion and the third convex portion is located at a higher position than the sole body in the thickness direction toward the sole of the foot. [Aspect 5] The foot sole wearing article according to any one of aspects 1 to 4, wherein the foot sole wearing article is an insole, a sandal, a shoe, or an indoor slipper.

[0010] In this specification, unless otherwise specified, the terms "protruding" and "protruding" refer to a protrusion from the reference plane of the sole body toward the sole of the foot, and a protrusion means sticking out higher than the surrounding area.

[0011] Furthermore, "centrally supporting" a specific part means that when the sole attachment is worn, the wearer feels stronger pressure on the specific part.

[0012] The term "upward" refers to the direction from the reference surface of the sole body toward the sole side, regardless of the vertical relationship, and "downward" refers to the direction from the sole side toward the reference surface of the sole body.

[0013] The term "longitudinal direction of the foot" means a direction substantially identical to the direction of the third metatarsal bone that forms the middle toe. "Substantially identical" means a direction that is within a range of inclination of about ±10 degrees, preferably about ±5 degrees, and more preferably about ±3 degrees, relative to a given direction.

[0014] The term "inner" refers to the side closer to the median plane when the plane that forms the axis of symmetry is considered to be the midline when the human body is considered to be roughly symmetrical, and the term "outer" refers to the side farther from the median plane.

[0015] When the position of the protrusion of the sole fitting body is explained using the bone parts of the foot, the position of the protrusion of the sole fitting body means the position of the corresponding bone part projected vertically onto the reference surface of the sole body. [Effects of the Invention]

[0016] The first convex portion reduces the amount of muscle activity in the tibialis anterior and gastrocnemius muscles when the wearer of the footwear maintains an upright posture, performs bending and stretching exercises, or maintains a load-lifting posture. As a result, muscle tension that occurs when working while standing, lifting loads, or in a forward-leaning posture can be alleviated, allowing the wearer to work in a more relaxed manner. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a plan view showing an example of an insole used as a sole attachment, with the foot skeleton superimposed thereon. [Figure 2] FIG. 10 is a plan view showing another example of an insole used as a sole attachment, with the foot skeleton superimposed thereon. [Figure 3] FIG. 10 is a plan view showing another example of an insole used as a sole attachment, with the foot skeleton superimposed thereon. [Figure 4] FIG. 10 is a plan view showing another example of an insole used as a sole attachment, with the foot skeleton superimposed thereon. [Figure 5] FIG. 10 is a plan view showing another example of an insole used as a sole attachment, with the foot skeleton superimposed thereon. [Figure 6] FIG. 10 is a plan view showing another example of an insole used as a sole attachment, with the foot skeleton superimposed thereon. [Figure 7] This is a photograph showing electromyographs attached to the tibialis anterior and gastrocnemius muscles below the knee on the right and left legs of a man. [Figure 8] FIG. 10 is a schematic diagram for explaining an upright state. [Figure 9] FIG. 10 is a schematic diagram for explaining the action of bending a leg. [Figure 10] FIG. 10 is a schematic diagram for explaining the operation of lifting luggage. [Figure 11] This is a photograph showing a state in which a device for measuring foot height is attached to a foot. [Figure 12A]1 is a graph showing the change in the center of gravity position when an adult male wears the insole of Comparative Example 1 and lifts a load. [Figure 12B] 10 is a graph showing the change in the center of gravity position when an adult male wears the insole of Example 2 and lifts a load. [Figure 13A] 10 is a graph showing the change in the center of gravity position when another adult male wears the insole of Comparative Example 1 and lifts a load. [Figure 13B] 10 is a graph showing the change in the center of gravity position when another adult male wears the insole of Example 2 and lifts a load. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the footwear of the present invention will be described with reference to the drawings. Note that the dimensions of each part in the drawings used in the following description are not necessarily the same as the actual dimensions and can be changed as appropriate. Furthermore, the same reference numerals will be used to designate parts that are the same in multiple drawings, and descriptions thereof will be omitted.

[0019] An example of a sole attachment used as an insole is shown in Figure 1. Figure 1 is a plan view of an insole with the foot skeleton superimposed on it.

[0020] 1, the sole wearing body 10 includes a sole body 11 on which the sole of the foot rests, and a first protrusion 13 protruding toward the sole of the foot from the sole body 11. The first protrusion 13 centrally supports the center 51c of the first metatarsal 51.

[0021] The first convex portion 13 protrudes from a reference surface (hereinafter may be simply referred to as the reference surface) of the sole body 11. The reference surface of the sole body 11 may be flat, but may also have a gently curved surface (for example, a curved surface in which the outer edge of the sole body 11 gently rises) within a range that does not impair the effects of the present invention.

[0022] In Figure 1, the area where the first convex portion 13 is formed on the reference surface of the sole body 11 is shown by an approximately circular dotted line, but as long as it centrally supports the center portion 51c of the first metatarsal 51, the area and shape where the first convex portion 13 is formed are not particularly limited. For example, the first convex portion 13 of the sole fitting body 10 may be substantially dome-shaped, projecting toward the sole of the foot from a substantially circular shape of a predetermined size on the reference plane of the sole body 11. Alternatively, the first convex portion 13 of the sole fitting body 10 may be substantially conical or polygonal pyramidal, etc., having an apex and a portion that slopes downward toward the surrounding bones.

[0023] Here, the central portion 51c of the first metatarsal 51 refers to the central portion obtained by dividing the first metatarsal 51 into three equal parts in the longitudinal direction. The base portion 51b of the first metatarsal 51 is a portion extending from the end portion 51b1 on the heel side of the first metatarsal 51 to one-third of the entire length of the first metatarsal 51. The head portion 51a of the first metatarsal 51 is a portion extending from the end portion 51a1 on the toe side of the first metatarsal 51 to one-third of the entire length of the first metatarsal 51.

[0024] Supporting the center 51c of the first metatarsal 51 centrally means that the wearer feels stronger pressure on the center 51c when wearing the shoes. For example, the wearer may also feel pressure on the bones around the center 51c, but relatively speaking, the wearer feels stronger pressure on the center 51c.

[0025] For example, the wearer may feel stronger pressure on the central portion 51c of the first metatarsal 51 than on the head portion 51a (excluding the sesamoid portion) of the first metatarsal 51 due to the presence of the first protrusion 13. Also, the wearer may feel stronger pressure on the central portion 51c of the first metatarsal 51 than on the medial cuneiform 53i due to the presence of the first protrusion 13. Furthermore, the wearer may feel stronger pressure on the central portion 51c of the first metatarsal 51 than on the second proximal phalanx 54 due to the presence of the first protrusion 13.

[0026] When the sole body 11 of the insole fitting body 10 protrudes at the arch portion 12, the first protrusion 13 may be formed separately from the arch portion 12, on the toe side of the tip of the arch portion 12 indicated by the dashed line on the reference plane. Note that the arch portion 12 is typically formed between the base 51b of the first metatarsal 51 and the talus 56.

[0027] A modified example of the sole fitting body 10 used as an insole is shown in Fig. 2. Fig. 2 is a plan view of the insole with the foot skeleton superimposed thereon.

[0028] 2, the sole wearing body 20 includes a sole body 11 on which the sole of the foot rests, and a first protrusion 23 protruding toward the sole of the foot from the sole body 11. The first protrusion 23 centrally supports the center portion 51c of the first metatarsal 51.

[0029] For example, the wearer may feel stronger pressure on the central portion 51c of the first metatarsal 51 than on the head portion 51a (excluding the sesamoid portion) of the first metatarsal 51 due to the presence of the first protrusion 23. Also, the wearer may feel stronger pressure on the central portion 51c of the first metatarsal 51 than on the medial cuneiform 53i due to the presence of the first protrusion 23. Furthermore, the wearer may feel stronger pressure on the central portion 51c of the first metatarsal 51 than on the second proximal phalanx 54 due to the presence of the first protrusion 23.

[0030] For example, as one example of various configurations that can be employed as the first protrusions, the first protrusions 23 may be substantially triangular pyramidal protrusions having a vertex 23t and a base extending in the longitudinal direction of the foot. The bottom surface of this protrusion and the ridge line from the vertex 23t of the substantially triangular pyramid are indicated by dotted lines. The substantially triangular base of the substantially triangular pyramid may be, for example, a substantially isosceles triangle with the longest base on the outer side and the vertex on the inner side in the reference plane of the sole body 11. Furthermore, the first protrusions 23 may be, when rotated 180 degrees, a substantially isosceles triangle with the longest base on the inner side and the vertex on the outer side in the reference plane of the sole body 11.

[0031] For example, the first protrusion 23 may have a portion (arrow 23a) that slopes downward from the center 51c of the first metatarsal 51 toward the femoral head 51a of the first metatarsal 51. The first protrusion 23 may also have a portion (arrow 23b) that slopes downward from the center 51c of the first metatarsal 51 toward the medial cuneiform 53m and / or intermediate cuneiform 53i. The first protrusion 23 may also have a portion (arrow 23c) that slopes downward from the center 51c of the first metatarsal 51 toward the medial outer edge 11b of the sole body 11 near the center 51c. Although not shown in FIG. 2, the sole body 11 may or may not have an arch portion 12, similar to that shown in FIG.

[0032] A modified example of the sole fitting body 10 used as an insole is shown in Fig. 3. Fig. 3 is a plan view of the insole with the foot skeleton superimposed thereon.

[0033] As shown in Figure 3, the sole attachment body 30 has, in addition to the first convex portion 13, a second convex portion 15 and a third convex portion 17 protruding from the sole body 11 toward the sole of the foot, and the second convex portion 15 centrally supports the navicular bone 55, and the third convex portion 17 centrally supports the cuboid bone 57.

[0034] Supporting the navicular bone 55 centrally means that when the wearer wears the support, they feel stronger pressure on the navicular bone 55. For example, the wearer may also feel pressure on the bones around the navicular bone 55, but relatively speaking, they feel stronger pressure on the navicular bone 55.

[0035] For example, due to the presence of the second protrusion 15, the wearer may feel stronger pressure on the navicular bone 55 than on the calcaneus 58. Furthermore, due to the presence of the second protrusion 15, the wearer may feel stronger pressure on the navicular bone 55 than on the base 52b1 of the third metatarsal bone 52.

[0036] In Figure 3, the location where the second convex portion 15 is formed on the reference plane of the sole body 11 is indicated by a substantially circular dotted line, but as long as support is provided with the navicular bone 55 as the center, the location and shape of the second convex portion 15 are not particularly limited. For example, the second convex portion 15 of the sole fitting body 30 may be substantially dome-shaped, protruding from a substantially circular shape of a predetermined size on the reference plane of the sole body 11 toward the sole of the foot. Alternatively, the second convex portion 15 of the sole fitting body 30 may be substantially conical or polygonal pyramidal, having an apex and a portion sloping downward toward the surrounding bone.

[0037] Furthermore, the location where the third convex portion 17 is formed on the reference plane of the sole body 11 is indicated by a substantially circular dotted line, but as long as support is provided with the cuboid bone 57 as the center, the location and shape of the third convex portion 17 are not particularly limited. For example, the third convex portion 17 of the sole fitting body 30 may be substantially dome-shaped, protruding toward the sole of the foot from a substantially circular shape of a predetermined size on the reference plane of the sole body 11. Alternatively, the third convex portion 17 of the sole fitting body 30 may be substantially conical or polygonal pyramidal, having an apex and a portion sloping downward toward the surrounding bones.

[0038] Supporting the cuboid bone 57 centrally means that, when the wearer wears the brace, he or she feels stronger pressure on the cuboid bone 57. For example, the wearer may also feel pressure on the bones around the cuboid bone 57, but relatively speaking, he or she feels stronger pressure on the cuboid bone 57.

[0039] For example, due to the presence of the third protrusion 17, the wearer may feel stronger pressure on the cuboid bone 57 than on the calcaneus 58. Furthermore, due to the presence of the third protrusion 17, the wearer may feel stronger pressure on the cuboid bone 57 than on the base 52b1 of the third metatarsal 52.

[0040] The third protrusion 17 protrudes from the reference plane of the sole body 11. For example, the third protrusion 17 may have a portion that slopes upward from the base 52b1 of the third metatarsal 52 toward the cuboid bone 57. The third protrusion 17 may also have a portion that slopes upward from the center 58c of the calcaneus 58 toward the cuboid bone 57.

[0041] In relation to the arch portion 12, the sole fitting body 30 may have an apex of a first protrusion 13 formed separately from the arch portion 12, closer to the toes than the tip of the arch portion 12 on the toe side. Also, a second protrusion 15 may be formed from the center of the arch portion 12 toward the heel. Furthermore, a third protrusion 17 may be formed in a position that at least partially overlaps with the second protrusion in the longitudinal direction of the foot.

[0042] By combining the first convex portion, the second convex portion, and the third convex portion, the overall balance is improved, and it is also possible to reduce the strain on the lower back, especially when lifting luggage.

[0043] Fig. 4 shows a modified example of a sole fitting body 30 used as an insole. Fig. 4 is a plan view of the insole with the foot skeleton superimposed thereon.

[0044] As shown in Figure 4, the sole attachment body 40 comprises a sole body 11 on which the sole of the foot rests, a first convex portion 23 protruding from the sole body 11 toward the sole of the foot, and a second convex portion 25 and a third convex portion 27 protruding from the sole body 11 toward the sole of the foot, the second convex portion 25 supporting the navicular bone 55 as its center, and the third convex portion 27 supporting the cuboid bone as its center. In this shape, for example, when the heel side edge of the bottom surface of the first convex portion and the toe side edge of the bottom surface of the second convex portion are arranged approximately parallel to each other, the discomfort when wearing the shoes caused by providing multiple convex portions can be reduced.

[0045] The second protrusion 25 is a generally triangular pyramid-shaped protrusion having a vertex 25t and a base extending toward the medial-lateral edge of the foot, and the bottom surface and the ridge line from the vertex 25t of the generally triangular pyramid are indicated by dotted lines. The generally triangular base of the generally triangular pyramid may be, for example, a generally isosceles triangle with the longest base on the inner side and the vertex on the outer side in the reference plane of the sole body 11.

[0046] For example, the second convex portion 25 may have a portion (arrow 25a) that slopes downward from the navicular bone 55 toward the intermediate cuneiform bone 53m. The second convex portion 25 may also have a portion (arrow 25b) that slopes downward from the navicular bone 55 toward the talus 56. The second convex portion 25 may also have a portion (arrow 25c) that slopes downward from the navicular bone 55 toward the medial outer edge portion 11b of the sole body 11 near the navicular bone 55.

[0047] Although not shown in FIG. 4, the sole body 11 may or may not have an arch portion 12, similar to that shown in FIG.

[0048] For example, the third convex portion 27 is an approximately triangular pyramid having an apex 27t at the part corresponding to the cubic bone 57 on the reference plane of the sole body 11 and an approximately triangular base, and the ridge line from the base and the apex 27t of the approximately triangular pyramid is shown by a dotted line.

[0049] For example, the area of ​​the bottom of the second convex portion 25 on the reference plane of the sole body 11 may be larger than the area of ​​the bottom of the third convex portion 27 on the reference plane.

[0050] Fig. 5 shows a modified example of a sole fitting body 40 used as an insole. Fig. 5 is a plan view of the insole with the foot skeleton superimposed thereon.

[0051] As shown in FIG. 5 , the sole fitting body 50 has a first convex portion 23 and a first composite protrusion 28 in which the second convex portion 25 and the third convex portion 27 are connected via a valley portion 28v. The outline of the first composite protrusion 28 in the reference plane surrounds the second convex portion 25 and the third convex portion 27 and has a valley portion 28v that narrows between the second convex portion 25 and the third convex portion 27, as shown by a dashed dotted line. The first composite protrusion 28 as a whole protrudes from the reference plane of the sole body 11. Note that as long as the second convex portion 25 and the third convex portion 27 centrally support the navicular bone 55 and the cuboid bone 57, respectively, the surface of the first composite protrusion 28 may be provided with an uneven surface such as a grained shape.

[0052] In the valley portion 28v, for example, a portion that slopes downward from the navicular bone 55 toward the lateral cuneiform bone 53l and a portion that slopes downward from the cuboid bone 57 toward the lateral cuneiform bone 53l may be connected. In addition, the valley portion 28v preferably protrudes from the reference plane of the sole body 11.

[0053] Fig. 6 shows a modified example of a sole fitting body 50 used as an insole. Fig. 6 is a plan view of the insole with the foot skeleton superimposed thereon.

[0054] 6, the sole fitting body 60 may have a fourth protrusion 22 that centrally supports the third metatarsal 52. The fourth protrusion 22 may have a substantially flat portion on its upper surface and may have a gently rising protrusion shape (for example, a substantially frustum shape) overall. Furthermore, the bottom surface of the fourth protrusion 22 in the reference plane of the sole body 11 may have a substantially teardrop shape with an obtuse angle on the toe side and an acute angle on the heel side.

[0055] Furthermore, the fourth protrusion 22 may form a second composite raised portion 29 together with the first protrusion 23. The outline of the second composite raised portion 21 on the reference plane is shown by a dashed line, and the second composite raised portion 29 as a whole protrudes from the reference plane of the sole body 11. The bottom surface of the first protrusion 23 and the bottom surface of the fourth protrusion 22 may partially overlap, and the overlapping portion may form a valley portion 29v.

[0056] 1 to 6 have been described using an insole as an example, the sole fitting article can be used for various sole fitting articles as long as the above-described shape is on the side facing the sole. For example, the sole fitting article includes sandals, shoes, indoor slippers, etc. in addition to insoles.

[0057] Any sandals may be used as long as they can achieve the effects of the present invention, but low-heeled sandals with wide toes are preferred, and examples of preferred sandals include sports sandals, beach sandals, clog sandals, clog sandals, comfort sandals, recovery sandals, etc. Of these, comfort sandals and recovery sandals are particularly preferred.

[0058] The shoes may be short boots or rubber boots, and examples include various sneakers (low-cut sneakers, mid-cut sneakers, high-cut sneakers, high-tech sneakers, low-tech sneakers, shoelace sneakers, slip-ons, band-type sneakers, etc.), leather shoes (natural leather shoes, synthetic leather shoes), work shoes, etc. The work shoes may be safety shoes equipped with a toe cap with a specified strength in the toe area for the purpose of protecting the wearer's feet when used in workplaces involving foot hazards, or may be work shoes for light work without a toe cap.

[0059] The insole mounting body of the present invention can be effectively used particularly as work shoes, since it can relieve muscle tension of the wearer when maintaining an upright posture or lifting loads.

[0060] Indoor shoes refer to all indoor shoes worn indoors, including slippers, shoes, boots, sandals, and the like.

[0061] The sole attachment may also have any other convexities and / or concaveities relative to the reference surface, as long as the first convexity and, if necessary, the second convexity and the third convexity can support each part of the bone described above.

[0062] The sole body can be made of known or commonly used materials. For example, the sole body of the sole body may be molded from rubber or synthetic resin (e.g., polyethylene, polypropylene, silicone resin, thermoplastic polyurethane (TPU), ethylene vinyl acetate copolymer (EVA), etc.).

[0063] The sole body and at least one convex portion selected from the group consisting of the first convex portion, the first convex portion, the first convex portion, and the first convex portion may be made of the same material or different materials. If made of different materials, the sole body may be made of a relatively soft material and the at least one convex portion may be made of a relatively hard material. Furthermore, if necessary, the sole mounting body may have a surface material disposed on the side that comes into contact with the sole of the foot.

[0064] When the footwear is a sandal, shoe, or indoor slipper, it may have an upper on top of the sole body into which the foot is inserted, and an outsole below the sole body that serves as the sole of the shoe. The upper and outsole can be integrated with the sole body by a known or conventional method. However, the sole body may or may not be fixed to the outsole. [Example]

[0065] The present invention will be described in more detail below with reference to examples, but the present invention is not limited by these examples. In the following examples and comparative examples, various physical properties were measured by the following methods.

[0066] [Example 1] An insole was made of ethylene vinyl acetate copolymer (EVA) and had first convex portions at the locations shown in Figure 2 relative to the sole body.

[0067] [Example 2] An insole was made of ethylene vinyl acetate copolymer (EVA) and had a first convex portion, a second convex portion, and a third convex portion at the locations shown in FIG. 4 relative to the sole body.

[0068] [Comparative Example 1] An insole was produced in the same manner as in Example 1, except that no convex portions were formed.

[0069] Comparative Example 2 An insole was produced in the same manner as in Example 2, except that the first convex portion was not formed.

[0070] (muscle activity) An adult male was fitted with and wore the insoles of Examples 1 and 2 and Comparative Example 1 in athletic shoes. As shown in Fig. 7, electromyographs were attached to the tibialis anterior (CH1 and CH3 in the figure) and gastrocnemius (CH2 and CH4 in the figure) muscles of the male's right and left feet below the knee, and muscle activity was measured when the male maintained an upright posture for 30 seconds as shown in Fig. 8, when the male performed one bending and stretching exercise over 20 seconds as shown in Fig. 9, and when the male maintained a posture of lifting a load (20 kg) from the floor for 15 seconds as shown in Fig. 10.

[0071] The amplitude of the electromyogram waveform obtained by the electromyograph was calculated as the absolute value of the positive (+) and negative (-) waveforms, and the muscle activity (μmV·s) was evaluated using the integral value.

[0072] (Center of gravity fluctuation) An adult male was asked to wear the insoles of Examples 1 and 2 and Comparative Example 1 in athletic shoes. The subject then performed the same movements as those used to measure muscle activity on a stabilometer to measure center of gravity sway. The sampling frequency was set to 60 Hz, and the area of ​​a convex polygon containing the set of center of gravity points was defined as the perimeter area, and the length of the entire trajectory of the center of gravity points was defined as the total trajectory length.

[0073] (Bone position) An adult male was asked to wear the insoles of Examples 1 and 2 and Comparative Example 1 in athletic shoes. As shown in Figure 11, reflective markers were attached to the first metatarsal, navicular, and cuboid bones, and the change in height from the ground was measured.

[0074] (Sensory test on lifting luggage) Regarding the burden on the lower back when wearing the insoles, five men and women were asked to wear the insoles of Example 2 and Comparative Example 1 attached to their athletic shoes. They then lifted a 20 kg load from the ground and evaluated the discomfort felt in the tibialis anterior, gastrocnemius, quadriceps, biceps femoris, and lower back around the lumbar vertebrae on a 5-point scale, with 5 representing the most severe burden, and the average was used for evaluation.

[0075] (Center of gravity fluctuation test for lifting luggage) Two adult males were fitted with the insoles of Example 2 and Comparative Example 1 in their athletic shoes and wore them. To confirm the effect of the insoles on lifting a 20 kg load, a force plate was used to conduct a center of gravity sway experiment. The time when the lifting began was set to 0 seconds, and the subjects lifted the load over 2-3 seconds, maintaining the same posture. The coordinate values ​​of the center of gravity position, which changed over a 16-second period from the time when the lifting began, were recorded to evaluate the center of gravity sway. Three measurements were taken, and the average value was used.

[0076] [Table 1]

[0077] As shown in Table 1, in all cases of maintaining an upright posture, performing bending and stretching exercises, and maintaining a load-lifting posture, Examples 1 and 2 were able to reduce the integrated values ​​of muscle activity in both the tibialis anterior and gastrocnemius muscles compared to Comparative Example 1. Because muscle activity in both the tibialis anterior muscle on the front side of the foot and the gastrocnemius muscle on the back side can be reduced, the foot can be put into a more relaxed state, and the burden on the foot can be reduced.

[0078] In particular, when bending and stretching and lifting a load were maintained, muscle activity tended to decrease in Example 1. On the other hand, when an upright posture was maintained, muscle activity tended to decrease in Example 2.

[0079] [Table 2]

[0080] As shown in Table 2, when maintaining an upright posture, performing bending and stretching exercises, and maintaining a load-lifting posture, Examples 1 and 2 were able to raise the positions of the first metatarsal, navicular, and cuboid bones compared to Comparative Example 1.

[0081] [Table 3]

[0082] As shown in Table 3, in Example 1, in the leaning forward posture, there was little swaying of the center of gravity, and the movement of the center of gravity was also small. In Example 1, since the outer peripheral area and total trajectory length in the upright posture were small, there was little swaying of the center of gravity, and it was shown that the subject could stand upright stably.

[0083] In addition, in Example 2, the outer peripheral area and total trajectory length were small during bending and stretching exercises and when lifting and holding a load from the floor, so there was little fluctuation in the center of gravity, and it was shown that the user could stand upright stably.

[0084] [Table 4]

[0085] As shown in Table 4, five adult males and females evaluated that for all muscles examined, Example 2, which has a convex portion, caused less discomfort in the tibialis anterior, gastrocnemius, quadriceps femoris, biceps femoris, and lower back around the lumbar vertebrae when lifting an object than Comparative Example 1, which does not have a convex portion.

[0086] Furthermore, when comparing the graphs in Figures 12A and 12B, which show data obtained by measuring the change in the center of gravity when an adult male wore the insole, it was found that for both COPx and COPy, the coordinates for each of COPx and COPy tended to be closer to 0, i.e., the change in the center of gravity tended to be smaller, when the insole of the example in Figure 12B was worn, compared to when the insole of the comparative example in Figure 12A was worn. This tendency was also observed in the graphs of Figures 13A and 13B, which show data on the measurement of the center of gravity fluctuation when another adult male wore the insole. Compared with the case where the comparative example insole in Figure 13A was worn, the coordinates of COPx and COPy tended to be closer to 0 when the example insole in Figure 13B was worn, i.e., the center of gravity fluctuation tended to be smaller. [Explanation of symbols]

[0087] 10, 20, 30, 40, 50, 60: insole attachment body, 11: sole body, 13, 23: first convex portion, 15, 25: second convex portion, 17, 27: third convex portion, 22: fourth convex portion, 28: first compound protuberance, 29: second compound protuberance, 51: first metatarsal, 51a: head of first metatarsal, 51b: base of first metatarsal, 51c: center of first metatarsal, 55: navicular bone, 57: cuboid bone

Claims

1. The sole body on which the sole of the foot rests, a first protrusion protruding from the sole body toward the sole side, The first protrusion centrally supports the center of the first metatarsal bone.

2. The foot sole attachment according to claim 1, wherein the central portion of the first metatarsal bone is pressed more strongly than the second proximal phalanx.

3. 2. The sole mounting body according to claim 1, further comprising a second convex portion and a third convex portion protruding from the sole body toward the sole of the foot, the second convex portion centrally supporting the navicular bone and the third convex portion centrally supporting the cuboid bone.

4. 4. The foot sole wearing body according to claim 3, wherein the second convex portion and the third convex portion are connected via a valley portion, and the valley portion existing between the second convex portion and the third convex portion is located at a higher position than the sole body in the thickness direction toward the sole of the foot.

5. The sole fitting article according to any one of claims 1 to 4, which is an insole, a sandal, a shoe, or an indoor slipper.

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