運動健康科學學系2018-04-202025-07-282018-04-202018-04-20https://ir.ntus.edu.tw/handle/987654321/65753計畫編號：NSC98-2410-H028-003-MY2 研究期間：2009/08/01~2011/07/31壘球推擊為左打者經常使用的打擊技巧，在打擊過程中，經由左腳的預先跨步，可拉近打者與一壘的距離，因而使成功踏上一壘的機會大增，因此，本研究的目的為比較壘球推擊與一般打擊在軀幹旋轉的生物力學上的差異。共有10位女性大學甲組壘球選手參與實驗，皆為左打者，利用Vicon三維動作分析系統，收集黏貼於身體上與球棒的反光標記，用以分析軀幹旋轉參數。結果發現，在打擊預備期時，推擊比一般打擊有較小的軀幹後旋產生，而在跟隨動作期時，一般打擊比推擊有較大的軀幹前旋，在擊球瞬間，推擊和一般打擊之間並無軀幹旋轉位置的顯著差異出現。結果顯示，使用此二種不同的打擊技巧，並不會影響打擊瞬間時軀幹相對於本壘板之位置。然而，對於影響打擊表現的因子而言，推擊的球棒線性速度與擊出球速，比一般打擊還要慢，同時，推擊的軀幹旋轉速度也比一般打擊來的小，因此，壘球選手選擇使用推擊技巧時，除了瞭解推擊時打者位置與一壘較近的優勢之外，也必須考量球速減低、限制預備期軀幹後旋與跟隨動作期軀幹前旋、以及軀幹旋轉速度變慢等運動生物力學上的改變，對打擊所造成的可能影響。 A slap hit is used for the left-handed batters who can get a running start before hitting the ball by using the left-side running slap. The purpose of this study was to compare the biomechanical difference of the torso twist between the slap and ordinary hit. Ten female left-handed college softball batters participated in this study. A VICON 612 motion analysis system was used to analyze the motion of the players. Surface reflective markers were placed on selective anatomical landmarks for each participant. Slap hits showed less backward rotation of the torso during wind-up phase while ordinary hits showed more forward rotation of the torso during follow-through phase. There was no significant difference between slap and ordinary hits at impact. The findings of this study suggested that torso rotational position at bat-ball contact was not affected by various hitting technique. Moreover, bat linear velocity, batted ball velocity and angular velocity of torso twist were decreased in slap hit compared to ordinary hit. The findings of this study suggested that in addition to the advantage of the hitter with more close position to first base, the possible disadvantage of slower batted ball velocity, reduced angular velocity of torso twist, the restricted torso backward twist in wind-up phase and limited torso forward twist in follow-through phase should be taken into consideration during performing the slap hit.2886361 bytesapplication/pdf壘球; 推擊; 運動學; 肌電圖; 揮棒速度Softball; slap hit; kinematics; electromyography; swing velocityreport