本研究主要目的在探討腳步移位對拳擊刺拳動作表現的影響，進一步分析運動學與動力學參數的差異。實驗以11名大專優秀拳擊運動員為實驗參與者（拳齡5年以上、平均年齡20.7 ± 1.7 years、平均身高173.5 ± 6.5 cm、平均體重66.0 ± 11.3 kg），隨機執行原地刺拳、上前足刺拳與雙足上步刺拳等3種刺拳動。研究通過VICON三度空間影像分析系統（250 Hz）與Kistler測力板（1000 Hz）同步進行動作過程的資料收集，並以Nexus 1.6.1版軟體與Polygon 3.1版計算不同刺拳動作執行過程上肢關節運動學參數與地面反作用力特徵，經重複量數單因子變異數分析與HSD事後比較後（α = .05），結果顯示雙足上步刺拳動作的肘關節速度最大值顯著大於上前足刺拳動作與原地刺拳動作（p < .05），雙足上步刺拳的肩關節速度最大值也顯著大於原地刺拳動作及上前足刺拳動作（p < .05）。若將拳速為0的瞬間定義為衝拳的終點位置，由速度最大值到達終點位置的平均時間，雙足上步刺拳速度顯著大於原地刺拳（p < .05）。在刺拳動作加速階段之位移量部分，雙足上步刺拳與上前足刺拳顯著大於原地刺拳（p < .05）。腳步移位對出拳最大速度雖然無顯著的改變，卻造成肩關節與肘關節在刺拳動作結束前的再一次加速特徵，使得出拳動作完成時，獲得較大的攻擊效果。

　　The purpose of this study was to investigate the effect of various stepping forwards for jab of boxing in biomechanical approach. Eleven collegiate level boxing players, training age over five years, were recruited voluntarily as the participants for this study (mean age: 20.7 ± 1.7 years old, mean height: 173.5 ± 6.5 cm, mean weight: 66.0 ± 11.3 kg). Participant were asked to perform stand jabs, one-foot forward jabs, and two-foot forward jabs without impact five times for each movement in delivered off the lead foot and bare-handed by random order. The Vicon 3-D motion analysis system with 8 cameras (MX-F40, 250 Hz) and two Kislter force platforms (Type 9260AA, 1000 Hz) were synchronized to record the kinematical and kinematical data respectively. The Vicon Nexus system (Version 1.6.1) and Polygon Authoring Tool (Version 3.1) were used to analyze the kinematic parameters of upper extremity and ground reaction force. Repeated measure one-way ANOVA and HSD post-hoc were adopted to analyze the statistical difference with an alpha level of .05. The result showed the peak velocity of elbow and shoulder in two-foot forward jab were higher than stand jab and one-foot forward jab (ps < .05). All the jab movements were without impact to perform punching in this study and this condition made the research assumed the instant of hand velocity equal zero was the terminal position of jab. The results showed time of peak shoulder velocity and time of peak elbow velocity to terminal position had no significant difference among three jab movements in this study (ps > .05). The displacement of hand in two-foot forward jab and one-foot forward jab were larger than stand jab significantly (p < .05) during the accelerated stage. Under the movements of one-foot forward jab and two-foot forward jab, the shoulder and elbow were both showed the characteristics of accelerated again. It seems reasonable to conclude that the stepping forward created the offense effect again during the end of jab movement.