On the Kinematical Characteristics of the Right Leg after Cross-step for the Outstanding Men's Javelin Athletes in China

In the research field of javelin throw,the study on the right leg’ exerting form and the right foot’s supporting skill after cross-step is the key point concerned by domestic researchers for a long time.After the cross-step,the main task of the right leg landing is to reduce the supporting time on one-leg,to let the left leg land in order to reduce the loss of horizontal speed as much as possible,to take the shape of double support quickly and exert oneself in order to make the best posture of having an effect,and to create conditions for the javelin to fly.By means of literature review,three-dimensional video recording analysis and mathematical statistics,the authors have studied the kinematical characteristics of the right leg after cross-stride for the outstanding men’s javelin athletes in China.The results indicate that during the support phase on one leg,the time of the right leg amortizing for Chinese athletes is generally long;the range of right knee amortizing is relatively wide;the biggest amortizing moves in right knee for most athletes appear in the period after the body’s center of gravity or the right hip moves past the supporting point;during the single and double support phase,the Chinese athletes’ ability of maintaining speed in various links with the right leg is relatively weak and their acceleration ability is pending for improvement.