SIMULATION STUDY OF THE PROXIMAL-DISTAL SEQUENCE IN THROWING MOTION

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The purpose of this study is to investigate the contributing factors to the kinetic chain principle in throwing motion. Three-dimensional simulation of throwing was carried out under various conditions. The throwing motions under the similar conditions to the simulation were analyzed with a motion capture system in order to validate the simulation results. As the speculation derived the both results of simulation and motion capture, the contributing factors to the kinetic chain principle were not the inertia distribution of the throwing arm and ball, but the joint configuration of the throwing arm. For instance, since the valgus/varus axis of elbow was a constraint joint, a passive joint torque was resulted at the elbow during the throwing motion. For utilizing the passive joint torque of elbow, it was inferred that the horizontal adduction of shoulder was activated earlier than the internal rotation of shoulder.