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體育學報 TSSCI
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中文摘要
本研究主要目的是分析不同勁度網球拍對碰撞後恢數係數的影響。實驗是將網球拍握把固定於虎頭鉗錢上，以餵球方式(發球機速度為20m/s)射出與網球拍的甜區做正面垂直碰撞。透過Nac的高達度攝影機(每秒1000張)將整個實驗過程拍攝下來，影帶經過PeakPerformance軟體系統進行數位化後， 在將資料加以分析後，獲得之結論為:50勁度的網球拍的恢復係數值為0.47 2 ; 60勁度網球拍的恢復係數值為0.546 ; 70勁度的網球拍的恢復係數值為 0.604。在變異數分析中，得知不同勁度網球拍的恢復係數(70)60>50)有顯 著的差異影響。
英文摘要
The puose of this pilot study was to investigate the correlation between the stiffness of tennis racket and the coefficient of restitution (COR). The tennis racket was fixed in a clamp and the tennis ball was controlled to hit the racket with a vertical impact at certain speed (approximate 20 m/sec).NAC high speed camera (1000 frame/sec) was used to record the whole experimental procedure. Thevideo tape was then digitized using Peak Performance System Afterstatistical analysis， the results showed: The COR of high stiffness racket (stiffness=70)、medium stiffness racket (stiffness=60) and low stiffness racket (stiffness=50) are 0.604，0.546，0.472， respectively. According to the ANOV A， the COR of different stiffness rackets are significantly different (stiffness 70> stiffness 60>stiffness 50).