抓舉動作地面反作用力、身體水平位移與垂直速度之探討

The Study of Ground Reaction Force, Horizontal Displacement and Vertical Velocity of Body during Snatch

目的：探討優秀舉重選手抓舉試舉不同重量時，於提鈴期至發力期之地面垂直反作用力、身體重心之水平位移、身體重心之垂直速度。方法：5名優秀舉重選手 （3男2女） ，進行試舉最佳成績80%、85%、90%重量，同時以3部數位攝影機（60Hz）和測力板（Kistler Quattro Jump, 500Hz）同步測量，並以APAS動作分析系統（Arial Performance Analyze system）與Quattro Jump軟體，進行地面垂直反作用力、槓鈴與身體重心之水平位移、身體重心之垂直速度之分析。結果：男、女選手在進行不同重量的抓舉試舉時，當試舉重量增加其地面垂直反作用力平均值也隨之增大。男選手為試舉85%重量時槓鈴與身體重心之水平位移量最小，試舉80%重量時槓鈴與身體重心之水平位移量最大；女選手為試舉80%重量時槓鈴與身體重心之水平位移量最小，試舉85%重量時槓鈴與身體重心之水平位移量最大。男選手為試舉80%重量時身體重心之垂直速度最快，試舉90%重量時身體重心之垂直速度最慢；女選手為試舉80%與90%重量時身體重心之垂直速度均為最快。結論：男選手的地面垂直反作用力表現範圍在2.35至3.93倍體重之間，女選手表現範圍則在2.87至3.49倍體重之間。無論試舉重量為何，女選手的槓鈴與身體重心之水平位移量均大於男選手。

Purpose:This study was to describe the ground reaction force(GRF), horizontal displacement and vertical velocity of body during first pull phase to second pull phase that lift different weight in snatch technique. Methods:Subjects included 5 elite weight lifters(3 male and 2 female). Three digital cameras (60Hz) and one force plate (500Hz) were capturing the motion and GRF of snatch lifts in 80%, 85% and 90% of personal optimum results. The horizontal displacement and vertical velocity of body was analysis by Arial Performance Analyze system, the GRF was measurement by Quatro Jump system. Results:When the weight of barbell was increase the GRF was increase, both in male and female subjects. In male subjects, the horizontal displacement of body was minimum in 85% weight lift and maximum in 80% weight lift. In female subjects, the horizontal displacement of body was minimum in 80% weight lift and maximum in 85% weight lift. In male subjects, the vertical velocity of body was faster in 80% weight lift and slower in 90% weight lift. In female subjects, the vertical velocity of body was faster in 80% and 90% weight lift. Conclusions:The range of GRF were 2.35 to 3.93 BW% which performed by male subjects, and 2.87 to 3.49 BW% which performed by female subjects. Whatever lifted which barbell weight, the horizontal displacement of body that performed by female subjects was larger than male subjects.