- 期刊
- Ahead-of-Print
臺灣成年男子舉重運動員挺舉成功與失敗之槓鈴軌跡分析
Kinematic analysis of the barbell trajectory of successful and unsuccessful clean and jerk among Taiwanese adult male weightlifters
摘要
緒論：舉重運動中，槓鈴軌跡（Barbell trajectory）是教練與選手重點關注的話題，可從其中觀察選手試舉時的槓鈴軌跡變化，以利於調整選手技術動作並提高試舉成功率，然而過去研究較少比較挺舉成功與失敗試舉之間的槓鈴軌跡差異，因此造成挺舉失敗之原因，是目前值得探討的問題。目的：比較挺舉各分期槓鈴偏移距離之差異。方法：本研究使用一臺Sony數位攝影機，拍攝頻率為每秒60張，以記錄26位男子運動員之挺舉試舉。影像收集完畢後，利用Hsu等（2018）影像分析技術獲取槓鈴軌跡，並使用配對t檢定（paired t-test）比較成功與失敗試舉之差異。結果：在上搏階段中，發現接槓期的水平偏移距離呈現顯著差異（p=0.047），且成功試舉的偏移距離顯著小於失敗試舉。另外，在上挺分期發現，下蹲期（p<0.01）與驅動期（p=0.04）的垂直偏移距離，皆為成功試舉顯著大於失敗試舉，其餘分期皆未觀察到有顯著差異性。結論：臺灣成年男子運動員挺舉主要失敗原因為，上搏接槓期產生過多水平偏移距離，浪費多餘體力再修正槓鈴軌跡上，影響後續上挺運動表現。此外，上挺下蹲距離不足，會減少上挺驅動期垂直高度，使運動員無法有足夠的高度完成接槓，最終導致試舉失敗。
並列摘要
Introduction: The barbell trajectory in weightlifting is a topic that both coaches and weightlifters focus on. Observation of the barbell trajectory during lifting can help weightlifters to adjust the movements and improve the success rate of lifts. However, previous studies have rarely compared the differences in barbell trajectory between goodlift and nolift in the clean and jerk. Thus, we assume that the reason for the failure of clean and jerk is worth investigating. Purpose: This study aimed to compare the barbell travel distance and velocity in different stages of clean and jerk. Methods: We utilized a Sony digital video camera at 60 frames per second to record the clean and jerk and further extract 26 male weightlifters. After the videos were collected, the barbell trajectory was obtained by Hsu et al. (2018), and the paired t-test was used to compare the differences in trajectory between goodlift and nolift. Results: In the clean stage, the horizontal travel distance of the catch shows a statistically significant difference (p = 0.047), and the distance of goodlifts is less than that of nolifts. In addition, in the jerk stage, the vertical travel distance of goodlifts between the jerk dip (p < 0.01) and the jerk drive (p = 0.04) is significantly greater than that of nolifts, while no significant differences are observed in the other stages. Conclusion: The main reason for the failure of the clean and jerk among Taiwanese adult male athletes is the generation of an excessive horizontal travel distance during the catch. Under this condition, athletes may waste power on modifying the barbell trajectory, which affected the subsequent performance of the jerk. In addition, insufficient jerk dip vertical distance reduces the vertical height during the jerk drive, thereby preventing the athlete from gaining sufficient height to complete the catch, eventually leading to the failure of the lift.