球棒重量與揮棒速度及握力相關之研究

Relationship among bat weight, swing velocity and grip force

好的打擊及防禦是棒球比賽獲勝的關鍵，而影響打擊的因素中，球棒重量及揮棒速度關係甚大。目的：在於探討不同球棒重量與揮棒速度及握力之相關性。方法：是以53位國內成棒甲組選手為研究對象，每位受試者分別用1200g（加重棒）、900g（慣用棒）、850g、800g、750g、700g、650g、600g和490g（教練棒）各做作五次揮棒，以StrokeMaxxer之球棒測速器所測得揮棒速度，帶入公式，求得受試選手更真實之揮棒速度；再以單因子重複量數變異數分析揮棒速度，最小顯著水準法進行事後比較，顯著水準設定為α=.05。以皮爾遜積差相關探討不同重量球棒揮棒速度與雙手握力間之相關。結果：發現球棒重量會影響選手的揮棒速度，及不同重量球棒間的揮棒速度皆達顯著相關（p<.05）；如1200g棒明顯較900g棒慢；800g棒較750g棒慢、700g棒較650g棒慢。另外雙手握力與800g以上球棒重量的揮棒速度達顯著相關（p<.05），而與750g以及650g以下球棒的揮棒速度則未達顯著相關（p>.05）。結論：球棒重量會影響選手的揮棒速度，結果顯示出成棒甲組選手在空揮800g以上的球棒時，雙手握力起了相當重要的作用；以此推論成棒甲組選手應可多使用750g或650g球棒做提升揮棒速度的訓練球棒，且應加強雙手的握力。

Purpose: Good hit and defense are key factors that decided win or loss in baseball games. Bat weight and swing velocity had high correlation that would be influenced one's hit ability. Therefore, the purpose of the study was to investigate the relationship between bat weight and swing velocity. Methods: Fifty-three of division one baseball players participated in this study. All of the subjects swung different weighted bats such as 1200, 900, 850, 800, 750, 700, 650, 600, and 490g with five rounds. Swing velocity were measured by StrokeMaxxer test equipment. High speed camera with 1000 Hz calculated the formula of swing velocity from StrokeMaxxer test equipment. (Vs (Strike speed, km/ h) = Vc (StrokeMaxxer test value) x 0.871 + 17.88). One-way repeated measurement ANOVA and Least significance difference (LSD) were used to statistic analysis. Results: The results of study shown that bats weights would be influenced swing velocity. The heavy one is slower than light one. For example, 1200g bat slower than 900g (normal weight bat) ; 800g bat slower than 750g bat ; and 700g bat slowerthan 600g , respectively. There is relationship between grip force and swing velocity, while above 800g bat was swung. Conclusion: Therefore, it suggested that baseball players need to swing 750g and 650g bat for improving swing velocity. Grip force is important factor, when baseball players swing above 800g bat.