大学バレーボール選手のレセプションにおける予測技能

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タイトル別名
  • Anticipation Skill of University Volleyball Players When Receiving a Service
  • ダイガク バレーボール センシュ ノ レセプション ニ オケル ヨソク ギノウ

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Receiving a service is a critical skill in volleyball, which is not only a defensive but could also be a start of an attack sequence. The ball-location anticipatory skill of volleyball players receiving a service was investigated by using the temporal occlusion method. Participants were experienced male university volleyball players（ n = 7) and male university students inexperienced in volleyball（ n = 8). They were required to anticipate the landing location of a ball by observing the server’s motions presented in edited videos. Five temporal occlusion conditions were adopted: t1（ at finishing back swing motions of the servers), t2（ at finishing the elevation of servers’ elbows during forward swing motions), t3（ when the ball makes contact with a hand), t4（ at finishing follow-through motions of servers), and t5（ no occlusion). Measurements of anticipatory skills consisted of the mean radial error, the mean lateral error, and the mean depth error. Results of analyzing the mean radial error indicated that experienced players could anticipate the landing location of the ball more accurately than inexperienced players under all the occlusion conditions. Analysis of the mean lateral error indicated that experienced players could extract meaningful information about the lateral direction prior to making ball-to-hand contact（ t3) and that the error rate of experienced players was less than that of inexperienced players in the t1 condition, indicating that experienced players could gain significant information before the servers finished the back swing motions of their services. The analysis of the mean depth error indicated that experienced players could anticipate the depth direction more accurately than inexperienced players in later occlusion conditions（ t3 and t5). These results are however limited by the ecological validity of the study because the servers’ motions were presented to the participants by using two-dimensional videos.

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