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柳 等(国立スポーツ科学センター) Yoshihiko KAWAZOE, Saitama Inst. of Tech., 1690 Okabe, Saitama Ryoso TOMOSUE, Yasuda Women's College Tadashi MURAMATU, Keio University Keiko YOSHINARI, Shirayuri Women's College Hitoshi YANAGI, Japan Institute of Sports Sciences At the current stage, the terms used in describing the performance of a tennis racket are still based on the feeling of an experienced tester or a player. Accordingly, there are many unknowns in the relationship between the performance estimated by a player and the physical properties of a tennis racket. It is often said that lower tensions increase the dwell time of the ball on the strings, offer less impact on the arm, and is better for the arm. However, there are few literatures with the experiments at the actual impact velocities. This paper investigates the effect of the string tensions on the impact shock vibrations of the arm of a tennis player. In the forehand stroke 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 loosely strung racket and tightly strung racket are similar and there is no big difference 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 near the center of the racket face, the waveforms of the loosely strung racket and tightly strung racket were also similar and there is no big difference despite of the difference of 20 lbs. Accordingly, it might be not correct that the looser strings are effective for the Tennis Elbow.

jointo, shinpojiumu koen ronbunshu

18S Measurement of the Shock Vibrations at the Wrist Joint during the Forehand Stroke and at the Elbow Joint during the Service Stroke with the Racket Strung Loosely Comparing with the Racket Strung Tightly