| Research purposes:In recent years, the elite women’s discus thrower Li Yanfeng’s performance is very excellent. On November24,2010, Li Yanfeng won Guangzhou Asian Games track and field women’s discus gold medal with66.18meteis. She cast a personal season-best of67.98meters in German the Shuna shell international salinity Cup Grand Prix on June6,2011. Also won the championship in the subsequent Daegu, South Korea Athletics World Championship and the National Track and Field Championship and the London Olympics in compliance matches and IAAF Diamond League Brussels station. This article is based on the Elite Women’s discus thrower Li Yanfeng for the study, The purpose is through the use of3D high speed video camera, Get motion video data and analytical, The last phase of Li Yanfeng discus kinematics and kinematic analysis, Summary of the kinematic characteristics of each stage of the study, to derive the main kinematic features of the Li Yanfeng throwing, provide an accurate basis for Li Yanfeng technical analysis and diagnosis, as well as country, inside and outside the athletes all stages of technology comparison, So as to achieve a means of kinematic analysis in the training, the training of the women’s discus thrower level and athletic ability to a marked improvement.Research methods:Through the use of literature, expert interviews, experimental method, mathematical, statistical method and other methods of elite female discus thrower Li Yanfeng in the2010National Track and Field Championships and Asian Games trials in the discus throw technology.Research results:(1) Li Yanfeng discus technology transferred from the double support phase: A large range of body squat, keeping a low center of gravity into the rotation, and full pre-swing action to the body to reverse the increases, the degree of rotation by a big margin the technical characteristics of.(2)The support rotating stage:Rotation time is short, large amplitude, knee rapid kicking force and the radius of a straight line to swing the swing leg forward of the center of gravity displacement, so that her body center of gravity trajectory tends straight discus-run level speed advantage.(3) During the flight phase:Vacated with less and less reduced-cake "overall loss of speed without support, lower limb rotation range of motion, shoulder axis and hip axis to reverse the degree of tight knee angle of the right foot with the ground.(4) Last hard phases: Rapidly rotating force main, the magnitude of the rotation force time, fast shot, shot point high technical characteristics.Research conclusion:In future training and competition, Li Yanfeng should continue to maintain the double-support phase of the technology, so is starting to turn to get a larger initial velocity. In the single support rotating stage, a greater level of speed to ensure rapid spin up the discus at this stage can be sustained acceleration, but increases the difficulty of control after the shot angle. Twisting in the vacated stage of shoulder and hip moderately tight, well beyond equipment posture, the right foot with the ground when a larger knee angle maintained a relatively high center of gravity of the body, can improve the discus shot a high degree of laying the groundwork for the final stages of force. Substantial and rapid rotation when the last hard, make the discus in the shot moment to get the most out of the shot speed and provides a foundation to ensure a higher release point for a good throw results. |
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