Kinematic Analysis Of Run-Up And Take-Off Connecting Techniques Of Outstanding Junior Female High Jumpers In Liaoning Province

Female high jump was a dominant track and field event in Liaoning province.Jin Ling once created an Asian record of 1.97 meters in female high jump,but after that the performance of female high jump has gradually declined and failed to maintain the glorious record.After referring to relevant data,the author found most studies were limited to the kinematic analysis of the techniques of outstanding high jumpers,and neglected that the imperfection of the cultivation of reserve forces resulted in the decline of female high jump project in China.From the perspective of kinematics,it made an initial diagnosis of the action techniques of excellent female high jumpers in Liaoning province aiming at existing problems in the competition.Many excellent young athletes representing the most outstanding reserve forces in Liaoning province attend Liaoning Youth Athletics Championship.In this paper,the top four young female athletes who attended Liaoning Youth Athletics Championship in 2016 were taken as research objects.Literature method,testing,contrastive analysis,mathematical statistics and interview were major research methods.By analyzing the kinematic parameters in the process of run-up and take-off of excellent young female high jumpers in Liaoning province,it aimed to analyze the existing problems and make technical diagnosis,then propose reasonable suggestions to improve the techniques and performances of the athletes,thus providing reference data for the future training.The innovation of this study is that it collects the indicators of the athletes’ movements in the live competition and observes their performances in the video to analyze the differences and problems existing among excellent young female high jumpers,and then comes up with advice to improve their movements and techniques etc.The research results show:1.The Quetelet Index of excellent young female athletes in Liaoning province is high.The following aspects should be stressed while selecting athletes for the competition,namely,the prediction of athletes ’ height,the control of weight growth,and the strengthening of general quality and special quality of the athletes.2.The horizontal velocity of the body weight has great difference with the vertical velocity at the moment that the take off-legs of the young female athletes in Liaoning province jump from the ground,which reflects different levels of the athletes,so the improvement of speed is the key factor for better performance.3.Most excellent young female athletes in Liaoning province encounter the same technical problems,such as being inactive to take off and hesitative to put the foot down,incomplete swinging movement and too small angle between two thighs while the swinging leg leaving the ground and landing on the take-off leg.4.There is a big difference between the actual angle and the ideal value of the kick and stretch of each joint,such joints as hip,knee and ankle at the moment that the take off-legs of the excellent young female athletes in Liaoning province jump from the ground,which has a great influence on the centroid height of the jump.5.The angle between two thighs of excellent young female athletes in Liaoning province at take-off stage is too small and the stretch distance of the take-off leg is not long,which means,they should strengthen the strength of their ankle joint and the amplitude and speed of their swing legs.