Strength Training for the Intrinsic Flexor Muscles of the Foot: Effects on Muscle Strength, the Foot Arch, and Dynamic Parameters Before and After the Training

Purpose The purpose of the present study was to verify the effects of intrinsic foot flexor strength training. Subjects The subjects were 12 healthy males without motor system disease. Methods A training method that involved flexion of all toe interphalangeal and metatarsophalangeal joints against a 3-kg load was implemented and was performed for 200 repetitions once per day, three times per week, for a period of eight weeks. Results Significant changes were observed for intrinsic foot flexor strength scores, foot arches, vertical jumping, 1-legged long jumping, and 50-m dash time. Conclusion This muscle strength training method significantly improved muscle strength scores, foot arch shape, and movement performance.