16S ラージ・ボールを打撃したときのテニスプレイヤ上肢系衝撃振動の測定 : フォアハンド・グランドストロークにおける手首部およびサービスにおける肘部の加速度(スポーツ工学シンポジウム2001)

概要

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This study was conducted because a recent rule change by the ITF has allowed larger balls (diameter 8 % increase, the same mass) to be used in tournaments. The intension of the larger ball is that it will slow down more during the flight through the air thus reducing the dominance of the 'big-servers' on fast surfaces such as grass. This paper investigates the effect of the larger ball on the impact shock vibrations of the arm of a tennis player. In the groundstroke test, accelerations at the player's wrist joint and the racket handle were measured. In the service stroke test, accelerations at the player's elbow joint and the racket handle were measured. The results showed that the waveforms of the normal ball and larger ball are very similar when a male tournament player hits flat forehand drive. With the measured accelerations at the player's elbow joint and the racket handle when a male tournament player hits service at the center of the racket face, the waveforms of the normal ball and larger ball were very similar. Since the drag force of larger ball should be larger than that of the normal ball, the velocity of a larger ball should be slower. Thus, the impact shock vibrations of the arm should be reduced
社団法人日本機械学会の論文
2001-11-07