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[Purpose] The purpose of this study was to clarify the changes in lower limb muscle activities during gait caused by affixation of a heel-arch pad and timing of sole grounding (FF). [Subjects] Forty-three legs (22 male, 21 female) of 28 healthy adults. [Method] Using a foot switch, we divided the subjects into an FF-Early group and an FF-Late group, and examined and compared the groups for changes in lower limb muscle activities using surface electromyography before and after affixation of a heel-arch pad. [Results] The muscle activities of the lateral hamstrings and tibialis anterior changed significantly with FF timing. The muscle activities of the pereneous longus and medial hamstrings changed significantly when the heel-arch pad was affixed. [Conclusion] The results suggest that muscle activities are changed by the timing of FF and heel-arch pad height.

Effects of Sole Grounding Timing and a Heel-arch Pad on Lower Limb Muscle Activities during Gait