BIOMECHANICAL ANALYSIS OF THE UPPER EXTREMITY IN TENNIS SERVICE

The purpose of this study was to calculate the external force, moment and power on the upper extremity of an elite player during the first service. The upper extremity of the subject was separated into three segments. The body segment parameter of the subject was calculated by using the mathematical model of truncated elliptical cone. The dynamical variables in the upper segment joints were determined via the 2D inverse dynamical solution. The present analysis shows the effectiveness of the truncated cone mathematical model as a high precision method for the calculation of body segment parameters. The wrist joint had been determined to sustain the greatest joint power during the contact phase. Regular training on the wrist extensors and elbow flexors is recommended for reducing the possibility of injury due to stress exerted on the flexor through eccentric contraction during the acceleration phase