軟式網球線表面粗糙程度對切球發球時球速和轉速之影響

EFFECTS OF SOFE TENNIS STRING RUBBED ON BALL VELOCITY AND SPIN VELOCITY

軟式網球為我國亞洲運動會上之重要奪牌項目之一，其特殊之低切發球方式與一般高壓發球方式有相當大的差異，為探討其拍線與球之間摩擦影響，因此本研究目的在於探討軟式網球線表面粗糙度對低切發球時球體球速和轉速之影響。研究方法：實驗以12位優秀軟網選手以低切式發球法，實際揮擊未摩擦球線與已摩擦球線之軟式網球拍做測試，利用頻率為1200赫茲(Hz)高速攝影機及動作分析系統，分析揮擊後球體之球速、轉速；統計方法以無母數檢定比較球線測試的差異，以成對樣本t檢定比較未摩擦球線與已摩擦球線在揮擊表現測試的差異。結果：發現已摩擦球線的轉速顯著大於未摩擦球線(p<0.05)。結論：摩擦軟式網球線會顯著提高擊球後的轉速。

The aim of this study was to exam effects of rubbed soft tennis string on ball velocity and spin velocity. Methods: 12 elite soft tennis players held the racket with and without rubbed string to serve. A high-speed cameras at 1200Hz and Siliconcoach motion analysis system were used to analyze ball velocity and spin velocity. Results: The spin velocity significant greater in hitting with rubbed string (p