DYNAMICS OF THE SHOULDER AND ELBOW JOINTS OF THE THROWING ARM DURING ROTATIONAL SHOT PUTTING -CASE STUDY

Abstract

The purpose of this study was to clarify the dynamical interacting characteristics between the segments of the shot put throwing arm, and to compare the quantitative information between a beginner and an experienced rotational shot putter. The DLT method of 3D cinematography was used. In the throwing motion, compressive force and horizontal adduction torque were mainly exerted at the shoulder joint, while anterior force and flexion torque were mainly exerted at the elbow joint, i.e. the muscle efforts mainly contributed to those forces and torques aforementioned. Subjects' patterns of forces and torques were generally similar, but we found that the timing of anterior, superior forces, external rotation torque, and distractive force were markedly different.