Kinematic Analysis On The Top Spin Of Two-hander Backhand Of Excellent Man Tennis Back-ups In Jiangsu Province

Tennis sport has become a very important modern athletics item until now.In our country, but the gap of level between foreign man tennis athlete and Chinese man tennis athlete is very big .Therefore,it is very meaningful to analyze the technique of our country's excellent man tennis athletes. In this paper, six outstanding junior tennis player of the Jiangsu's junior sports school were choosen to be the research object. By using the two Mega high-speed cameras with shooting frequency of 300 frames per secound, exposure time of 1/2000 second synchronization, we collected the three-dimensional moving images information,and adopted the German SIMI-Motion Video Image Analysis System to analysis the images. And using the methods of research such as literature, video analysis and statistics to analysis their kinematic parameters when they hit top spin of two-hander backhand . Then we find some little fault about their two-hander backhand Technique. Details need to be adjusted and the two-hander backhand technology need to be made more perfect. Besides, this research also provide some parameters to the coaches for training improve. Not noly Enhance the theoretical and practical significance of junior, but for the development of junior in our countory.Study results showed that: (1)To all of them six,Fanxx and Liuxx's body center of gravity did not fully transited to the left leg in the circular backswing, keeping a certain angle of the left leg can sufficient tread in the hitting stage.(2)Wuchengx's angle between shoulder and hip of the test objecst aer relatively small, not conducive to hit the ball by turning the hip,shoulder in the stage of backswing. (3)The wrist of the Wutianx is not fixed, not conducive to the stability hitting ball in the Hitting time.(4) The test objects are contact with the principle of whipping action before hitting the ball, they can hit the faster tennis by reducing the shoulder angle, arms close to the trunk, reducing the angular in order to radius increasely.(5) The left and right shoulder angle of the test objects should be larger moderate to avoid hitting clip arm, the swing arm to push the full as much as possible, so you can quickly hit a better tennis in the finish process.(6) The right knee angle of the Liuxx is not straight premature tread to avoid hitting only arm, resulting in inability to hit the ball in the finish process.