不同目標對女網選手正拍攻擊球球速之比較

THE COMPARISON OF ELITE FEMALE TENNIS PLAYERWITH FOREHAND ATTACK BALL SPEED OF DIFFERENT TARGET

本研究之目的在於探討女網選手的正拍攻擊球在不同目標下之球速變化與影響。5位大專甲組女網選手自願參與，每位受詴者均進行30顆正拍攻擊球測詴，其中分為無目標、斜線以及直線各10顆。球速部分是使用Casio-F1高速攝影機以每秒300張進行拍攝，並且搭配Kwon3D套裝軟體進行事後分析。所得球速資料以SPSSfor Windows 19.0版，進行重複量數單因子變異數分析考驗分析各組球速之差異，統計顯著水準皆設定α=.05。研究結果顯示，女網選手在正拍無目標的攻擊球球速顯著小於斜線與直線攻擊球球速；而斜線攻擊球球速大於直線攻擊球球速但沒有達顯著差異，不過每位受詴者均顯示斜線球速大於直線球速之趨勢。本研究發現女網選手在正拍攻擊球時，無目標的球速顯著低於其他兩組的原因可能是選手在出手時才選定方向，使得力量無法集中釋出；而正拍斜線攻擊球球速大於直線攻擊球球速的部分，則在於斜線的距離較長，所需要施加在球上的平擊力大於旋轉力，因此而造成差異，反之亦然。

The aim of this study was to investigate elite female tennis player with forehand attack ball speed of different target. Five female tennis players were recruited as participants. Every participant has to hit 30 balls with her best strength， and the target partition 1.) No target 2.) Cross-court 3.) Down the line， and every single target have to got in 10 ball. A digital video camera， operating at 300 frames per second， were used to measure ball speed and accuracy of forehand attack in the respective situation. The ball speed was acquired by Kwon3D. All about ball speed data were tested by one way repeated ANOVA (α=.05). Results showed that cross-court and down the line of ball speed were significant greater than no target ball speed; and cross-court was also greater than down the line of ball speed， but there were no significant. This study find female tennis player hit the ball to cross-court more than down the line of ball speed， because when player use same power to hit the ball， hit to down the line has to use more spin， so the velocity is disperse more than the other one.