Purpose： The purpose of this study is to explore the influence of the motions of takeoff legs and free legs on the performance. Method：This study used five cameras with a speed of 60 frames per second to record the ...Purpose： The purpose of this study is to explore the influence of the motions of takeoff legs and free legs on the performance. Method：This study used five cameras with a speed of 60 frames per second to record the jumpers performance in the 2003 National Games Competition. According the Dempster model(1955) to record 14-segments and 21-joint points on the jumper's performance through the Kwon3D analysis software to analyze the dates. Result and Conclusion： The data of competitions were computed. According to the results, the conclusions are as following: 1. The muscle response coefficients in the three phases are not significantly correlated. 2. The less leg stiffness during hop and jump phase, the longer the phase distance in females(r=-0.716, r=-0.848, p＜.05). 3. A lower degree of knee angular stiffness is beneficial to achieving greater phase distance during male's Hop phase and female's step phase(r=-0.715, r=-0.821, p＜.05). 4. The jumpers do not use the hip joint to alleviate the vertical force during support phase. 5. The actual distance is significantly correlated with the speed of free legs only for females during the Jump-buffer and Pressing phases; in other words, a higher speed of the free legs results in better performance(r=0.727, r=0.850 P＜.05). 6. Changes in the intersection angle of the takeoff leg and free leg do not reach significance in all three phases. Suggest：It is suggest that strengthen the training of free leg will good for acquirement of vertical speed to promote sport performance.展开更多
文摘Purpose： The purpose of this study is to explore the influence of the motions of takeoff legs and free legs on the performance. Method：This study used five cameras with a speed of 60 frames per second to record the jumpers performance in the 2003 National Games Competition. According the Dempster model(1955) to record 14-segments and 21-joint points on the jumper's performance through the Kwon3D analysis software to analyze the dates. Result and Conclusion： The data of competitions were computed. According to the results, the conclusions are as following: 1. The muscle response coefficients in the three phases are not significantly correlated. 2. The less leg stiffness during hop and jump phase, the longer the phase distance in females(r=-0.716, r=-0.848, p＜.05). 3. A lower degree of knee angular stiffness is beneficial to achieving greater phase distance during male's Hop phase and female's step phase(r=-0.715, r=-0.821, p＜.05). 4. The jumpers do not use the hip joint to alleviate the vertical force during support phase. 5. The actual distance is significantly correlated with the speed of free legs only for females during the Jump-buffer and Pressing phases; in other words, a higher speed of the free legs results in better performance(r=0.727, r=0.850 P＜.05). 6. Changes in the intersection angle of the takeoff leg and free leg do not reach significance in all three phases. Suggest：It is suggest that strengthen the training of free leg will good for acquirement of vertical speed to promote sport performance.
