Publication:

慢速壘球打擊在不同好球板位置的運動學分析

研究背景：過去有許多研究探討棒球打擊在好球帶不同位置的動作分析，但較少針對慢速壘球在好球板不同位置的打擊動作分析，因此，本實驗目的為瞭解慢速壘球打擊在好球板前、中、後位置運動學的差異。研究方法：參與者為12名大專慢速壘球系隊男性右打者選手。以Vicon動作分析系統收集揮棒過程的運動學，使用重複量數單因子變異數分析比較不同好球板位置的運動學差異。研究結果：好球板中間位置打擊有較大的球棒速度與球速。和中間位置相比，好球板前位置有較長的揮棒時間與較大的步幅距離，上部軀幹和骨盆在前腳離地與著地時有較小的向後旋轉角度，在球棒與球接觸時有較大的向前旋轉角度，左及右肘關節在球棒與球接觸時有較小的屈曲角度，在手開始向前及球棒與球接觸時，有較大的右膝屈曲角度，且會出現較大的右肘伸展角速度。另外，和中間位置相比，好球板後位置在前腳離地與著地時有較大的上部軀幹和骨盆的向後旋轉角度，在球棒與球接觸時有較小的上部軀幹和骨盆的向前旋轉角度，且有較大的左肘屈曲角度，在揮棒四個時期有較小的右膝關節屈曲角度。結論：大專慢速壘球打者在面對好球板不同位置時會有打擊運動學的差異，本研究結果可以提供慢速壘球教練與打者瞭解在不同好球板位置時打擊動作的差異。

Background: Several researches regarding the kinematic analysis of baseball hitting have been studied in literatures. However, little information was known about slow-pitched softball hitting. Therefore, the purpose of this study was to investigate the kinematics of different strike plate areas in slow pitch softball hitting. Method: Twelve college slow pitch hitters participated in this study. Vicon motion analysis system was used to measure the kinematics of slow pitch softball hitting. One-way ANOVA with repeated measure was used to compare the differences between different strike plate areas. Results: A faster ball velocity and bat velocity were found in middle strike plate area. Compared to middle strike plate area, anterior strike plate area showed a longer hitting time, greater stride length, lesser backward rotation on upper torso and pelvis at foot-off and foot-on, lesser elbow flexion angle at impact, greater right knee flexion angle at hands started to move forward and impact, and faster right elbow extension velocity. Moreover, compared to middle strike plate area, posterior strike plate area showed a greater backward rotation on upper torso and pelvis at foot-off and foot-on, lesser forward rotation on upper torso and pelvis at impact, greater left elbow flexion angle, and lesser right knee flexion angle. Conclusion: Kinematic differences between different strike plate areas were found in college slow pitch softball hitters. The information could be provided for the coaches and hitters to better understand the effect of different strike plate areas on hitting kinematics.