Kinematical Analysis On The Throwing Technique Of Some Elite Male Javelin Throwers In China

Javelin Throw is an complex action, the division of javelin throw technology is holding a gun, gun approach, finally forced, buffer and javelin flight five parts. This paper takes 2014 national Long throw open(Chengdu Station) top three players(Zhao Qinggang, Ma Qun and Dai Li) as the research objects, the result of throwing one of the best throwing step and final effort techniques of kinematics analysis was carried out on the three athletes with 3D video analysis method, to obtain the throwing step and final push technology index, and then had a comparison with the domestic and foreign elite athletes, find out the rules and characteristics of the technique, have certain reference value for the future teaching and training.According to the comparative kinematics analysis, the results showed that: 1), in throwing step, step, step throwing step of China’s three athletes, stride frequency are not very reasonable, directs the gun step, step long time too short too fast, cadence, rhythm is blah throwing step one, the reasons are the first throwing step is too small, the third step is too big; China’s three athletes third step time were 0.34 s, show that China’s three athletes in throwing step third step on the body center of gravity is higher, then the cause the loss of horizontal velocity; China’s three athletes fourth step frequency is not the fastest, described in the enthusiasm of the throwing step fourth step athletes left leg brake is not enough; the third step to the fourth step process, three Chinese athlete’s body after the shrink large angle, Zhao Qinggang’s body after the dip reduce the maximum of 4.01 °,That Zhao Qing gang holding capacity beyond the equipment state of the poor, not the full extension of the body; in the cross step left foot push off the ground in an instant three players left leg pedal angle mean value is 76.84°,there is a certain gap with foreign elite athletes Horn’s 72.55°, that three athletes cross step left foot push off the ground in an instant the left leg pedal angle is too large. 2)In the last force stage, Zhao Qinggang in the right foot moment’s body after the angle is 26°, which is the most reasonable in three athletes, which can lay the foundation for the final force sufficient trunk "whipping" action; on the right side of technology at the stage of final exertion, right pedal stretching technique of Zhao Qinggang and right leg support the force effect is the best, the stretching time is 0.17 s; the athletes in the last exertion period has not formed the double support before they have begun to turn the elbow, shoulder, resulting in the formation of the poor "full bow" action, have not formed the greatest degree of super more instruments action; right foot to left foot moment, Zhao Qinggang pulling angle dropped from 160 °to 155°, introduces its strong throwing control ability, left after the lead gun action more fully; on the left side of technology at the stage of final exertion, three athletes left support technique as the excellent athletes in the world, is mainly the left knee buffer is too large, resulting in the momentum conversion rate lower than the world outstanding athletes, In the last effort of left knee stretching process, three players left knee pedal not fully as excellent athletes in the world; the shot instantly in the javelin, Zhao Qinggang has a relatively large horizontal velocity and vertical velocity, were 27.6 m/s, 19.6 m/s, explains Zhao Qinggang speed transfer effect is better; the initial conditions of Zhao Qinggang is better, Dai Li the worst, the initial angle of attack of three athletes of-0.8°, 3.4 °, 5.1 °higher than the ideal angle-3 °. While the initial angle of attack Zhao Qinggang’s closest to the optimum angle of attack, which may be one of the reasons for his better performance...