Abstract Summary
Shoes influence the movement of the foot and lower extremity during running. Stiffer shoes enhance running economy and both the metatarsophalangeal joint and the ankle joint mechanics are suggested as possible pathways for this improvement. However, stiffer shoes will also influence the midfoot kinematics during running. Therefore, the aim of this study is to investigate the influence of the stiffness of the midsole on the multi-segment foot kinematics. We found a reduced range of motion in the midfoot flexion/extension and an increase in the ab/adduction when running with stiffer insoles. The reduction in midfoot flexion is mainly due to a decrease in the peak plantarflexion occurring during propulsion phase as the component of the supination to stiffen the foot.
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