- 期刊
棒球投手投球時最佳自由腳伸踏方向與體重移動之分析
Optimization Analysis on Free Foot Direction and Center of the Weight Transfer in the Pitching Motion
摘要
本研究主要探討投手投球時，自由腳伸踏方向與體重中心移動軌跡對於球速和好球帶準確性是否有很高的顯著性，受測者分為兩組；A組是以國立臺灣體育學院棒球代表隊9名投手群（平均球迷=128.7 ± 3.4517 km/h簡稱為快速球群）、B組是該校其他項目代表隊9名選手群（平均球速=92.9 ± 10.2 km/h簡稱為低速球群）。顯示快速球群在投球時，自由腳的伸踏方向和體重中心移動軌跡朝向本壘板所致。而低速球群在投球時，自由腳的伸踏方向及體重中心移動軌跡偏離本壘板甚多所致。兩組經由t-test p值1.96159*^(-5)，顯示快速球群與低速球群有非常顯著的差異。依好球帶的準確率視之，快速球群之好球帶準確率為84%，低速球群之好球帶準確率為18%。因此在投手投球時自由腳的方向和體重中心移動是否正確，不論是球迷或好球帶的準確性會造成很大的差異。
並列摘要
In this study, free foot direction and center of weight were used to analyze the performance of college baseball team players and none baseball players in the pitching motion. These players are divided into two groups; (A) High-Speed Group (average ball speed=128.7 ± 3.45km/h for 9 males) and (B) Low-Speed Group (average ball speed=92.9 ± 10.2km/h for 9 males).It is revealed that for the High-Speed Group during pitching the free foot direction and the center of weight were approaching toward the home plate, while for the Low-Speed Group the free foot direction and the center of weight were deviating from the home plate. T-test p value of 1.96159*^(-6) was determined via the difference of velocities and analysis of ball into strike zone average gave 84% for the High-Speed Group and 18% for the Low-Speed Group. These concluded that the free foot direction and the center of weight contributed a great significant difference level in the pitching motion.