Foot-mounted body

Abstract

Provided is a foot-mounted body that can be used as an insole, a sandal, or the like. 【Solution means】The foot-mounted body 30 includes a sole body 11 on which the sole of the foot is placed, and a first convex portion 13 protruding from the sole body 11 toward the sole side of the foot. The first convex portion 13 centrally supports the central portion 51c of the first middle metatarsal bone 51. The foot-mounted body 30 may include a second convex portion 15 and a third convex portion 17 protruding from the sole body 11 toward the sole side of the foot. In that case, the second convex portion 15 centrally supports the navicular bone 55, and the third convex portion 17 centrally supports the cuboid bone 57.

Description

Technical Field

[0001] The present invention relates to a foot-wearing body that can be used as an insole, sandals, etc.

Background Art

[0002] The foot-wearing body has a specific shape in order to exert some influence on the sole of the foot. The foot-wearing body can be inserted inside a shoe and used as an insole, for example, or a foot-wearing body provided with a sole having a specific shape can be directly worn as sandals or slippers.

[0003] For example, Patent Document 1 (Japanese Patent No. 6966078) discloses a foot orthosis used as an insole for an insole of a footwear or inserted into a footwear, the foot orthosis having a first protrusion protruding so as to press the ball of the big toe, a second protrusion protruding so as to press the ball of the little toe, and a base portion on which the first protrusion and the second protrusion are disposed, the first protrusion pressing the ball of the big toe, the second protrusion pressing the ball of the little toe, and being characterized in that walking can be performed with the tip side lifted higher than the heel side.

[0004] In this foot orthosis, when walking, the first protrusion of the foot orthosis presses the ball of the big toe, and the second protrusion presses the ball of the little toe to appropriately hold the arch of the sole of the foot, so that the walking difficulty caused by the collapse of the arch can be eliminated.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in Patent Document 1, although it is possible to walk with the toe side lifted higher than the heel side, when the toe side becomes higher, the center of gravity will shift from the toe side to the heel side. As a result, when wearing this insole and taking a forward-leaning posture, it will cause excessive tension on the leg muscles.

[0007] An object of the present invention is to provide a sole-mounted body that can reduce the burden on the wearer even in a forward-leaning posture. [Means for Solving the Problems]

[0008] The inventor of the present invention has found that by using a sole body having a convex portion that centrally supports the central portion of the first middle metatarsal bone, the muscle activity in a forward-leaning posture can be relaxed by the convex portion. Furthermore, the inventor of the present invention has found that in a preferred embodiment, by combining a first convex portion that centrally supports the central portion of the first middle metatarsal bone, a second convex portion that supports around the cuboid bone, and a third convex portion that supports around the navicular bone, not only can the muscle activity in a forward-leaning posture be relaxed, but also the fluctuations in the center of gravity in the front-rear direction and the left-right direction in an upright posture can be reduced.

[0009] The present invention may include the following aspects. [Aspect 1] A sole body for placing the sole of the foot, and a first convex portion protruding from the sole body toward the sole side, and it is provided with a sole-mounted body, wherein the first convex portion centrally supports the central portion of the first middle metatarsal bone. [Aspect 2] The sole-mounted body according to Aspect 1, wherein the central portion of the first middle metatarsal bone is pressed stronger than the second proximal phalanx bone. [Aspect 3] Furthermore, it is provided with a second convex portion and a third convex portion protruding from the sole body toward the sole side, the second convex portion supports around the navicular bone, and the third convex portion supports around the cuboid bone. The sole-mounted body according to Aspect 1. [Aspect 4] 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 present at a position higher than the sole body in the thickness direction toward the sole, the sole attachment body according to Aspect 3. [Aspect 5] The sole attachment body according to any one of Aspects 1 to 4, wherein the sole attachment body is an insole, a sandal, a shoe, or indoor footwear.

[0010] In this specification, the terms "projecting" and "projects" mean, unless otherwise specified, a projection from the reference surface of the sole body toward the sole side, and a projection means protruding higher than the surroundings.

[0011] Also, "centrally supporting" a specific part means that when wearing the sole attachment body, the wearer feels a stronger pressing force against the specific part.

[0012] The term "upward" means the direction from the reference surface of the sole body toward the sole side regardless of the vertical up-and-down relationship, and "downward" means 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 the same as that of the third middle metatarsal bone forming the middle finger of the foot. Substantially the same direction means a direction existing within a range of inclination of about ±10 degrees, preferably about ±5 degrees, more preferably about ±3 degrees with respect to a given direction.

[0014] The term "inside" means the side closer to the midline plane when the midline plane is centered with respect to the plane serving as the axis of symmetry when the human body is considered to be approximately bilaterally symmetric, and the term "outside" means the side farther from the midline plane.

[0015] When explaining the position of the protruding portion of the sole attachment body using the bone part of the foot, the position of the protruding portion of the sole attachment body means the position where the corresponding bone part is projected from the vertical direction onto the reference surface of the sole body. [Advantages of the Invention]

[0016] By having the first convex portion, when the wearer of the sole-mounted body maintains an upright posture, when performing flexion and extension movements, and when maintaining a posture of lifting a load, the muscle activity levels of the tibialis anterior muscle and the gastrocnemius muscle can be reduced. As a result, during standing work and during the operation of lifting a load, the muscle tension generated in the forward-leaning posture can be alleviated, and the wearer can perform the work more relaxedly.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12A

Figure 12B

Figure 13A

Figure 13B

Embodiments for Carrying Out the Invention

[0018] Hereinafter, with reference to the drawings, embodiments of the sole-mounted body of the present invention will be described. Note that the dimensions of each part of the figures used in the following description are not necessarily the same as the actual ones and can be changed as appropriate. Also, overlapping parts in a plurality of drawings are omitted from the description by using the same reference numerals.

[0019] An example of the sole-mounted body used as an insole is shown in FIG. 1. FIG. 1 is a plan view of the insole showing the superposition of the foot skeleton.

[0020] As shown in FIG. 1, the sole-mounted body 10 includes a sole main body 11 on which the sole of the foot is placed, and a first convex portion 13 protruding from the sole main body 11 toward the sole side. The first convex portion 13 supports the center portion 51c of the first middle metatarsal bone 51 in a centered manner.

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

[0022] In FIG. 1, the portion where the first convex portion 13 is formed on the reference surface of the sole body 11 is indicated by a substantially circular dotted line. However, as long as the center portion 51c of the first metatarsal bone 51 is supported centrally, the portion and shape where the first convex portion 13 is formed are not particularly limited. For example, the first convex portion 13 of the sole-mounted body 10 may be a substantially dome shape that protrudes toward the sole side from a substantially circular shape of a predetermined size on the reference surface of the sole body 11. Alternatively, the first convex portion 13 of the sole-mounted body 10 may be a substantially conical shape, a substantially polygonal pyramid shape, etc. having a top portion and a portion that inclines downward toward the surrounding bones.

[0023] Here, the center portion 51c of the first metatarsal bone 51 refers to the center portion obtained by trisecting the first metatarsal bone 51 in the longitudinal direction. Note that the bone base portion 51b of the first metatarsal bone 51 is a portion that occupies 1 / 3 of the total length of the first metatarsal bone 51 from the heel-side end portion 51b1 of the first metatarsal bone 51. Also, the bone head portion 51a of the first metatarsal bone 51 is a portion that occupies 1 / 3 of the total length of the first metatarsal bone 51 from the toe-side end portion 51a1 of the first metatarsal bone 51.

[0024] Supporting centrally around the center portion 51c of the first metatarsal bone 51 means that when the wearer wears it, a stronger pressing force is felt with respect to the center portion 51c. For example, the wearer may also feel a pressing force on the bones around the center portion 51c, but relatively, a stronger pressing force is felt with respect to the center portion 51c.

[0025] The wearer may, for example, feel a stronger pressing force on the center portion 51c of the first metatarsal bone 51 than on the bone head portion 51a (excluding the sesamoid bone portion) of the first metatarsal bone 51 due to the presence of the first convex portion 13. Also, the wearer may feel a stronger pressing force on the center portion 51c of the first metatarsal bone 51 than on the medial cuneiform bone 53i due to the presence of the first convex portion 13. Further, the wearer may feel a stronger pressing force on the center portion 51c of the first metatarsal bone 51 than on the second phalanx bone 54 due to the presence of the first convex portion 13.

[0026] When the sole body 11 of the sole-mounted body 10 bulges at the instep portion 12, the first convex portion 13 may be formed separately from the instep portion 12 on the toe side of the instep portion 12 shown by the dashed line on the reference plane. Here, the instep portion 12 is typically formed between the bone base 51b of the first metatarsal bone 51 and the talus 56.

[0027] Fig. 2 shows a modified example of the sole-mounted body 10 used as an insole. Fig. 2 is a plan view of the insole showing the superposition of the foot skeleton.

[0028] As shown in Fig. 2, the sole-mounted body 20 includes a sole body 11 on which the sole of the foot is placed, and a first convex portion 23 protruding from the sole body 11 toward the sole side of the foot. The first convex portion 23 supports the central portion 51c of the first metatarsal bone 51 in a centered manner.

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

[0030] For example, as an example of various types that can be adopted as the first convex portion, the first convex portion 23 may be a substantially triangular pyramid-shaped convex portion having a vertex 23t and a base extending in the longitudinal direction of the foot. The bottom surface of this convex portion and the ridge lines from the vertex 23t of the substantially triangular pyramid are shown by dashed lines. The substantially triangular shape that is the bottom surface of the substantially triangular pyramid may be, for example, a substantially isosceles triangle having the longest base on the outside and the vertex on the inside on the reference plane of the sole body 11. Also, the first convex portion 23 may be in a state rotated 180 degrees, that is, a substantially isosceles triangle having the longest base on the inside and the vertex on the outside on the reference plane of the sole body 11.

[0031] For example, the first convex portion 23 may have a portion (arrow 23a) that slopes downward from the central portion 51c of the first middle metatarsal bone 51 toward the head portion 51a of the first middle metatarsal bone 51. Further, the first convex portion 23 may have a portion (arrow 23b) that slopes downward from the central portion 51c of the first middle metatarsal bone 51 toward the medial cuneiform bone 53m and / or the intermediate cuneiform bone 53i. Further, the first convex portion 23 may have a portion (arrow 23c) that slopes downward from the central portion 51c of the first middle metatarsal bone 51 toward the inner outer edge portion 11b of the sole body 11 near the central portion 51c. Although not shown in FIG. 2, the sole body 11 may or may not have the arch portion 12 as in FIG. 1.

[0032] FIG. 3 shows a modified example of the plantar attachment body 10 used as an insole. FIG. 3 is a plan view of the insole showing the superposed foot skeletons.

[0033] As shown in FIG. 3, the plantar attachment body 30 includes, in addition to the first convex portion 13, a second convex portion 15 and a third convex portion 17 that project from the sole body 11 toward the sole side. The second convex portion 15 centrally supports the navicular bone 55, and the third convex portion 17 centrally supports the cuboid bone 57.

[0034] Centrally supporting the navicular bone 55 means that when the wearer wears it, the wearer feels a stronger pressing force against the navicular bone 55. For example, the wearer may also feel a pressing force on the bones around the navicular bone 55, but relatively, the wearer feels a stronger pressing force against the navicular bone 55.

[0035] For example, due to the presence of the second convex portion 15, the wearer may feel a stronger pressing force against the navicular bone 55 than against the calcaneus 58. Further, due to the presence of the second convex portion 15, the wearer may feel a stronger pressing force against the navicular bone 55 than against the bone base 52b1 of the third middle metatarsal bone 52.

[0036] In FIG. 3, the portion where the second convex portion 15 is formed on the reference surface of the sole body 11 is indicated by a substantially circular dotted line. However, as long as it supports around the navicular bone 55, the portion and shape where the second convex portion 15 is formed are not particularly limited. For example, the second convex portion 15 of the sole mounting body 30 may be a substantially dome shape that protrudes toward the sole side from a substantially circular shape of a predetermined size on the reference surface of the sole body 11. Or, the second convex portion 15 of the sole mounting body 30 may be a substantially conical shape, a substantially polygonal pyramid shape, etc. having a top portion and a portion that inclines downward toward the surrounding bones.

[0037] Also, the portion where the third convex portion 17 is formed on the reference surface of the sole body 11 is indicated by a substantially circular dotted line. However, as long as it supports around the cuboid bone 57, the portion and shape where the third convex portion 17 is formed are not particularly limited. For example, the third convex portion 17 of the sole mounting body 30 may be a substantially dome shape that protrudes toward the sole side from a substantially circular shape of a predetermined size on the reference surface of the sole body 11. Or, the third convex portion 17 of the sole mounting body 30 may be a substantially conical shape, a substantially polygonal pyramid shape, etc. having a top portion and a portion that inclines downward toward the surrounding bones.

[0038] Supporting mainly around the cuboid bone 57 means that when the wearer wears it, the wearer feels a stronger pressing force against the cuboid bone 57. For example, the wearer may also feel a pressing force on the bones around the cuboid bone 57, but relatively, feels a stronger pressing force against the cuboid bone 57.

[0039] The wearer may, for example, feel a stronger pressing force against the cuboid bone 57 than against the calcaneus 58 due to the presence of the third convex portion 17. Also, the wearer may feel a stronger pressing force against the cuboid bone 57 than against the bone base 52b1 of the third middle metatarsal bone 52 due to the presence of the third convex portion 17.

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

[0041] In relation to the instep portion 12, the plantar attachment body 30 may have a vertex of the first convex portion 13 formed separately from the instep portion 12 on the toe side of the foot, beyond the tip of the instep portion 12 on the toe side. Also, a second convex portion 15 may be formed from the central portion of the instep portion 12 toward the heel side. Further, the third convex portion 17 may be formed at a location where it at least partially overlaps with the second convex portion 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 becomes good, and it is particularly possible to reduce the burden on the waist when lifting a load.

[0043] FIG. 4 shows a modified example of the plantar attachment body 30 used as an insole. FIG. 4 is a plan view of the insole showing the superposition of the foot skeleton.

[0044] As shown in FIG. 4, the plantar attachment body 40 includes a sole body 11 on which the sole of the foot is placed, a first convex portion 23 protruding from the sole body 11 toward the sole side, a second convex portion 25 protruding from the sole body 11 toward the sole side, and a third convex portion 27. The second convex portion 25 supports around the navicular bone 55, and the third convex portion 27 supports around the cuboid bone. When, for example, the heel-side side of the bottom surface of the first convex portion and the toe-side side of the bottom surface of the second convex portion are arranged substantially parallel to each other as in this shape, the discomfort during wearing caused by providing a plurality of convex portions can be reduced.

[0045] The second convex portion 25 has a vertex 25t and is a substantially triangular pyramid-shaped convex portion having a bottom side extending in the direction of the inner outer edge of the foot. The bottom surface and the ridge lines from the vertex 25t of the substantially triangular pyramid are shown by dotted lines. The substantially triangular shape that is the bottom surface of the substantially triangular pyramid may be, for example, a triangle having a longest bottom side on the inner side and a vertex on the outer side in the reference plane of the sole body 11, and may be a substantially isosceles triangle.

[0046] For example, the second convex portion 25 may have a portion (arrow 25a) that inclines downward from the navicular bone 55 toward the intermediate cuneiform bone 53m. Also, the second convex portion 25 may have a portion (arrow 25b) that inclines downward from the navicular bone 55 toward the talus 56. Also, the second convex portion 25 may have a portion (arrow 25c) that inclines downward from the navicular bone 55 toward the inner 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 the instep portion 12 as in FIG. 1.

[0048] For example, the third convex portion 27 is a substantially triangular pyramid having a vertex 27t and a substantially triangular bottom portion at a portion corresponding to the cuboid bone 57 in the reference plane of the sole body 11. The bottom surface and the ridge lines from the vertex 27t of the substantially triangular pyramid are shown by dotted lines.

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

[0050] FIG. 5 shows a modified example of the plantar attachment body 40 used as an insole. FIG. 5 is a plan view of the insole showing the superposition of the foot skeleton.

[0051] As shown in FIG. 5, the sole mounting body 50 has a first convex portion 23 and a first composite ridge portion 28 in which a second convex portion 25 and a third convex portion 27 are connected via a valley portion 28v. The outer shape of the first composite ridge portion 28 on 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, which is indicated by a dashed line. The first composite ridge portion 28 protrudes from the reference plane of the sole body 11 as a whole. As long as the second convex portion 25 and the third convex portion 27 respectively support the navicular bone 55 and the cuboid bone 57 centrally, unevenness such as a ribbed shape may be provided on the surface of the first composite ridge portion 28.

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

[0053] FIG. 6 shows a modified example of the sole mounting body 50 used as an insole. FIG. 6 is a plan view of the insole showing the superposition of the foot skeleton.

[0054] For example, as shown in FIG. 6, the sole mounting body 60 may have a fourth convex portion 22 that centrally supports the third middle metatarsal bone 52. The fourth convex portion 22 may have a substantially flat portion on the upper surface and may be a protruding shape (for example, a substantially frustum shape) that gently rises as a whole. Further, the bottom surface of the fourth convex portion 22 on the reference plane of the sole body 11 may have a substantially water droplet shape with an obtuse angle on the toe side of the foot and an acute angle on the heel side of the foot.

[0055] Further, the fourth convex portion 22 and the first convex portion 23 may form a second composite ridge portion 29 together. The outer shape of the second composite ridge portion 21 on the reference plane is indicated by a dashed line, and the second composite ridge portion 29 protrudes from the reference plane of the sole body 11 as a whole. The bottom surface of the first convex portion 23 and the bottom surface of the fourth convex portion 22 may partially overlap, and the overlapping portion may form a valley portion 29v.

[0056] Although FIGS. 1 to 6 have been described by taking an insole as an example, the sole-mounted body can be used for various sole-mounted bodies as long as it has the above-described shape on the side facing the sole. For example, the sole-mounted body includes, in addition to the insole, sandals, shoes, indoor shoes, and the like.

[0057] As for the sandals, any sandals may be used as long as the effects of the present invention can be achieved. However, low-heel sandals with a wide toe tip are preferable. For example, preferable sandals include sports sandals, beach sandals, clog sandals, thong sandals, comfort sandals, recovery sandals, and the like. Among these, comfort sandals, recovery sandals, and the like are particularly preferable.

[0058] The shoes may be low shoes or high boots. For example, various sneakers (low-cut sneakers, mid-cut sneakers, high-cut sneakers, high-tech sneakers, low-tech sneakers, lace-up sneakers, slip-ons, band-type sneakers, etc.), leather shoes (natural leather shoes, synthetic leather shoes), work shoes, and the like can be mentioned. The work shoes may be safety shoes equipped with a toe core having a specified strength at the toe part for the purpose of protecting the feet of the wearer used in a workplace accompanied by danger to the feet, or work shoes not equipped with a toe core for light work.

[0059] When the wearer holds an upright posture or performs an operation of lifting a load, the sole-mounted body of the present invention can be particularly effectively used from the viewpoint of being able to relieve the tension of the muscles of the wearer.

[0060] Indoor shoes mean all overshoes worn indoors, and examples include indoor shoes of a slipper type, a shoe type, a boot type, a sandal type, and the like.

[0061] In addition, as long as the first convex portion, and, if necessary, the second convex portion and the third convex portion can support the respective portions of the bones described above, the sole attachment body may be provided with any other convex portions and / or concave portions with respect to the reference plane.

[0062] The sole attachment body can be made of a known or conventional material. For example, the sole body of the sole attachment 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 formed of the same material or different materials. When formed 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. Further, if necessary, the sole attachment body may be provided with a surface material on the side that contacts the sole of the foot.

[0064] When the sole attachment body is a sandal, a shoe, or indoor footwear, it may be provided with an upper for inserting the foot on the upper side of the sole body and an outsole serving as a shoe sole on the lower side of the sole body. The upper and the outsole can be integrated with the sole body by known or conventional methods. However, the sole body may or may not be fixed to the outsole.

Example

[0065] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited by these. In the following examples and comparative examples, various physical properties were measured by the following methods.

[0066] [Example 1] An insole having a first convex portion at the location shown in FIG. 2 with respect to the sole body was produced from ethylene vinyl acetate copolymer (EVA).

[0067] [Example 2] An insole having a first convex portion, a second convex portion, and a third convex portion at the locations shown in Fig. 4 was produced for the sole body using ethylene vinyl acetate copolymer (EVA).

[0068] [Comparative Example 1] An insole was produced in the same manner as in Example 1, except that no convex portion was 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 amount) The insoles of Example 1 and 2 and Comparative Example 1 were respectively installed in sports shoes and worn by adult men. Also, as shown in Fig. 7, electromyometers were attached to the anterior tibial muscles (CH1 and CH3 in the figure) and gastrocnemius muscles (CH2 and CH4 in the figure) below the knees on the right and left feet of the men. When maintaining an upright posture for 30 seconds as shown in Fig. 8, when performing one flexion and extension movement over 20 seconds as shown in Fig. 9, and when maintaining a posture of lifting a load (20 kg) from the floor for 15 seconds as shown in Fig. 10, the muscle activity amount was measured.

[0071] Regarding the amplitude of the electromyogram waveform obtained by the electromyometer, the values of the positive waveform (+) and negative waveform (-) were calculated as absolute values, and the muscle activity amount (μmV·s) was evaluated by the integral value thereof.

[0072] (Center of gravity fluctuation) The insoles of Example 1 and 2 and Comparative Example 1 were respectively installed in sports shoes and worn by adult men. Then, the same movements as when measuring the muscle activity amount were performed on a center of gravity fluctuation meter, and the center of gravity fluctuation was measured. The sampling period was set to 60 Hz for recording, and the area of the convex polygon including the set of center of gravity points was used as the outer peripheral area, and the total length of the locus of the center of gravity points was evaluated as the total locus length.

[0073] (Position of bone) Adult males were each made to wear sports shoes with the insoles of Example 1, Example 2, and Comparative Example 1 installed therein. As shown in Fig. 11, reflective markers were attached to each of the first midfoot bone, navicular bone, and cuboid bone, and the change in height from the ground was measured.

[0074] (Sensory test regarding the operation of lifting a load) Regarding the burden on the waist during wearing, five men and women were each made to wear sports shoes with the insoles of Example 2 and Comparative Example 1 installed therein. Then, the operation of lifting a 20-kg load from the ground was performed, and the discomfort in the tibialis anterior muscle, gastrocnemius muscle, quadriceps femoris muscle, biceps femoris muscle, and the waist around the lumbar spine was evaluated on a five-point scale with the most burdensome case being 5, and the evaluation was performed based on the average value thereof.

[0075] (Center of gravity sway test regarding the operation of lifting a load) Two adult males were each made to wear sports shoes with the insoles of Example 2 and Comparative Example 1 installed therein. Then, in order to confirm the influence of the insoles during the operation of lifting a 20-kg load, a center of gravity sway experiment was performed using a floor reaction force meter. The time point when lifting started was set as 0 seconds, the load was lifted over 2 to 3 seconds, and regarding the state of maintaining the same posture, the coordinate values of the center of gravity position changing during the 16 seconds from the time of lifting were shown to evaluate the sway of the center of gravity. Measurement was performed three times, and the average value thereof was adopted.

[0076] [Table 1]

[0077] As shown in Table 1, in any of the cases of maintaining an upright posture, performing a flexion and extension movement, and maintaining a load-lifting posture, Examples 1 and 2 were able to reduce the integrated value of the muscle activity amount in both the tibialis anterior muscle and the gastrocnemius muscle as compared with Comparative Example 1. Since the muscle activities of both the tibialis anterior muscle on the front side of the foot and the gastrocnemius muscle on the rear side can be reduced, the foot can be made to be in a more relaxed state, and the burden on the foot can be reduced.

[0078] In particular, when maintaining the flexion and extension movements and the posture of lifting a load, there was a tendency for muscle activity to decrease in Example 1. On the other hand, when maintaining the upright posture, there was a tendency for muscle activity to decrease in Example 2.

[0079]

Table 2

[0080] As shown in Table 2, in any of the cases of maintaining the upright posture, performing the flexion and extension movements, and maintaining the posture of lifting a load, Examples 1 and 2 were able to raise the positions of the first metatarsal bone, navicular bone, and cuboid bone compared to Comparative Example 1.

[0081]

Table 3

[0082] As shown in Table 3, in the forward bending posture, in Example 1, the center of gravity fluctuation was small, and the movement of the center of gravity point was also small in the outer peripheral area and total trajectory length in the upright posture in Example 1. Therefore, it was shown that the center of gravity fluctuated slightly and the subject could stand upright stably.

[0083] Also, in Example 2, since the outer peripheral area and total trajectory length were small during the flexion and extension movements and when lifting and holding a load from the floor, it was shown that the center of gravity fluctuated slightly and the subject could stand upright stably.

[0084]

Table 4

[0085] As shown in Table 4, for any of the muscles to be investigated, five adult men and women evaluated that Example 2 with the convex portion had less discomfort felt in the tibialis anterior muscle, gastrocnemius muscle, quadriceps femoris muscle, biceps femoris muscle, and the lumbar region around the lumbar vertebrae when lifting a load compared to Comparative Example 1 without the convex portion.

[0086] Also, when comparing the graphs of FIGS. 12A and 12B, which are data from an adult male wearing an insole and measuring the fluctuations of the center of gravity, for both COPx and COPy, when wearing the insole of the example in FIG. 12B compared to wearing the insole of the comparative example in FIG. 12A, the coordinates for each of COPx and COPy tend to be closer to 0, that is, the fluctuations of the center of gravity tend to be smaller. This tendency was the same in the graphs of FIGS. 13A and 13B, which are data from another adult male wearing an insole and measuring the fluctuations of the center of gravity. When wearing the insole of the example in FIG. 13B compared to wearing the insole of the comparative example in FIG. 13A, the coordinates for each of COPx and COPy tend to be closer to 0, that is, the fluctuations of the center of gravity tend to be smaller.

Explanation of Signs

[0087] 10, 20, 30, 40, 50, 60: Plantar wearing body, 11: Sole body, 13, 23: First convex part, 15, 25: Second convex part, 17, 27: Third convex part, 22: Fourth convex part, 28: First composite raised part, 29: Second composite raised part, 51: First middle metatarsal bone, 51a: Head part of the first middle metatarsal bone, 51b: Bottom part of the first middle metatarsal bone, 51c: Central part of the first middle metatarsal bone, 55: Navicular bone, 57: Cuboid bone

Claims

1. A sole body on which the sole of the foot is placed, and a first convex portion protruding from the sole body toward the sole side of the foot, and is a sole attachment body that has a top portion and is shaped to incline downward toward the surrounding bones, and supports the central portion trisected in the longitudinal direction of the first midfoot bone. The sole attachment body that supports the first midfoot bone only by the first convex portion.

2. The sole attachment body according to claim 1, wherein the central portion of the first midfoot bone is pressed stronger than the second metatarsophalangeal bone.

3. Furthermore, it includes a second convex portion and a third convex portion protruding from the sole body toward the sole side of the foot. The second convex portion has a top portion and is shaped to incline downward toward the surrounding bones and supports the navicular bone. The third convex portion has a top portion and is shaped to incline downward toward the surrounding bones and supports the cuboid bone. The sole attachment body according to claim 1.

4. 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 position higher than the sole body in the thickness direction toward the sole of the foot. The sole attachment body according to claim 3.

5. The sole attachment body according to any one of claims 1 to 4, wherein the sole attachment body is an insole, a sandal, a shoe, or indoor footwear. ​

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