Abstract
Shock attenuation property of shoe is especially important in indoor-sports because indoor-shoe users perform a jump and suffer a large landing impact force repeatedly. Moreover foot landing pattern is essentially different between jumping and running in that the forefoot lands first with the rearfoot next in jumping and vice-versa in running. This study firstly developed an evaluation method of shock attenuation in drop jump with accelerometer after the relationship between the acceleration data on the shank and sensory test values of shock attenuation was found. Furthermore, the stress-strain curves of shoe-sole materials under compressive load and also plantar pressure distribution during drop jumps were measured to calculate the stored energy in the forefoot and rearfoot areas of shoe-sole respectively. It was found that the main area attenuating the landing force by its compressive deformation in drop jump was the rearfoot of shoe-sole however the shock attenuation property could be affected by the hardness of the forefoot area if the mechanical conditions of the rearfoot area were the same.
