Kinematics Analysis on the Cross Step Skills of Chinese Female Javelin Thrower Lv Huihui

摘要

The paper use the documents the mathematical statistics and the three-dimension picture analysis on the cross step skill of Lv Huihui, the champion of China Long Open in 2013 and get the kinematics parameters and summarize her skill features. The results show that Lv made a proper leaning back during the cross step stage. Her elbow angle is 146.4°, while the angle of world outstanding female javelin athletes is 160.2°, it has a big gap of 13.8°. In the horizontal velocity during the cross step, Lv Huihui lags behind world outstanding female athletes. The conclusion shows that Lv did not fully extend her elbow joint in the cross step stage, the elbow stress is not enough, throwing arm shoulder too loose; the speed of Lv need to be improved. Because the step size is too long, will effect postpone time of the force, thus affect the coherence of action, reduce the running speed and force effect, ultimately affect the performance in the competition; the long cross step time is the main reason for the loss of horizontal speed.