目的：本研究主要目的為比較投擲快速球與蝴蝶球之運動學差異並了解投擲兩種球種不同反覆次數間之動作參數一致性。方法：受試者為一名中國文化大學棒球隊投手。在實驗過程中，受試者分別投擲10球快速球及10球蝴蝶球，並以EVaRT4.4三維動作分析系統進行資料收集。分析後，以組內相關係數了解投擲快速球與蝴蝶球不同反覆次數間之動作參數一致性，再以描述性統計的方式採用差異百分比探討投擲此兩種球種間之運動學差異。結果：投擲快速球間與蝴蝶球間之反覆次數皆呈現高相關的一致性。本研究在棒球投球的四個分期所比較的26項運動學參數中，共發現有將近50%的參數在投擲快速球與蝴蝶球間明顯的差異。結論與建議：打者可經由投擲蝴蝶球在釋球期軀幹較正直之特性判別投手欲投擲的球種，投手亦可以本研究為參考學習了解投擲蝴蝶球的特性。
The purpose of this study was to compare the kinematic differences between fastball and knuckleball pitching, and the consistency within its movement. EVaRT4.4 Motion Analysis System was utilized to capture 10 fastball and 10 knuckleball pitches thrown by a collegiate pitcher in Chinese Culture University baseball varsity team during the experiment. Intra-class correlation coefficient (ICC) was to examine the uniformity of the pitching movement of fastball and knuckleball separately, and the descriptive statistic was applied in order to compare the kinematic differences between the two different pitches. Both fastball and knuckleball pitching evinced high relevance in each trial. 26 kinematic parameters at foot contact during the arm-cocking and arm-acceleration phases, and at ball release were measured, approximately 50% of the parameters exhibit conspicuous difference between fastball and knuckleball pitching. In conclusions, baseball batters may have the best opportunity to identify knuckleball pitching by its less lateral trunk tilt characteristic, and pitchers may learn the traits of knuckleball pitching through the current study.
