Abstract
The purpose of this study is to quantify shoe-sole recovery torque during stance phase in running motion. Five running shoes with different thickness midsole were used as test shoes. The sole bending angle-moment curves of forefoot region in each shoe were obtained from a shoe bending testing machine. One male runner who was heel striker participated and ran on the asphalt surface in the constant speed of 2.78 m/s. Forefoot bending angle during the support phase were calculated based on trajectories of makers attached on the shoe-sole. This study revealed that 1) initial bending stiffness derived from the sole bending angle-moment curve has a correlation with cubed values of the sole thickness, 2) initial bending stiffness in the plantar flexion is higher than that in dorsal flexion, and 3) both maximum plantar and dorsal recovery torques during stance phase correlate with sole bending stiffness.
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