高速スウィング動作時の関節拘束軸トルク生成メカニズムの定量化

抄録

Joint constraint axial torques such as valgus/varus axial torques at knee and elbow joints are crucial factor of joint injury during several sports motions. The purpose of this study was to propose a method which quantifies the generating mechanism of the constraint torque using the induced constraint torque analysis based on dynamic equation with respect to the constraint axial torque. Three-dimensional coordinate data of markers attached to rugby players during place kick motions were measured with a motion capture system with one force plate. The kicking-side leg was modelled as three rigid segment linked model consisting of thigh, shank and foot segments. The equation of motion and dynamic equation with respect to the constraint axial force were obtained. The dynamic contributions of individual terms such as joint torque term, motion-dependent term and gravitational force term to the constraint axial torque was derived from these equations. The results show that 1) active joint torques contributed mainly to the constraint axial torque during the rugby kicking motion and 2) the contribution of joint torque cancelled with the contribution of the gravitational term when considering generating factors of the motion-dependent term during the kicking motion with respect to an example.