Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 21, 2018 - November 23, 2018
The purpose of this study was to investigate the functional roles of the joint torques of the outer-side support leg considering deforming characteristics of foot segment during cutting motion. Three male participants performed cutting motions under bared and shod conditions. The three-dimensional coordinated data of markers attached to the body and foot were measured with a motion capture system, and the ground reaction forces exerted by fore and rear side of foot, which is modelled as two-segment model separated at the navicular bone, were measured with 3 force plates. Bending and torsional stiffness of axes at virtual joint, set at the boundary part of the foot segments, were calculated from static equilibrium equation with respect to the moments exerted about the two axes. The functional roles of the leg joints were quantified from a dynamic force equation derived from multi-body dynamics. The results obtained in this study show that 1) the bending stiffness differ between subjects, 2) braking and accelerating forces were manly caused by ankle plantar flexion and knee flexion torques, and 3) the stiffness of the bending maybe relates to the contribution of ankle plantar flexion torque to the braking force during the braking phase.