テニスにおいて「強い」ボールの返球は「弱く」なりやすいのか? : 大学生トップクラス選手における一例からの一考察

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  • テニス ニ オイテ 「ツヨイ」 ボール ノ ヘンキュウ ワ 「ヨワク」 ナリヤスイノカ ? : ダイガクセイ トップクラス センシュ ニ オケル イチレイ カラ ノ イチ コウサツ
  • Tenisu ni oite "tsuyoi" boru no henkyu wa "yowaku" nariyasuinoka ? : daigakusei toppukurasu senshu ni okeru ichirei kara no ichi kosatsu
  • How does a tennis player's ball speed, ball spin, and racket speed change when the opponent's balls get stronger?

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How does a tennis player's ball speed, ball spin, and racket speed change when the opponent's balls get stronger? In this paper, "stronger" balls are defined as either having greater spin when speed is the same or greater speed when spin is the same. To address this question, two different tennis ball machines fed strong and weak balls, respectively, to a university student tennis player, who hit forehand ground strokes. When the player hit balls fed by the strong machine, his ball speed, ball spin, and racket speed respectively decreased by about 11.3%, 14.9%, and 20.7%, compared with the weak machine. Ball speed decline was significant (p<0.01), but ball spin and racket speed decline was not significant (p>0.05). These results indicate that a tennis player's balls could get weaker when the opponent's balls get stronger.

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