Kinematical Analysis Of Swing And Stretch Techniques In Fosbury Flop Stage Of Chinese Elite Women High-Jumper

High jump was the strong point of China's competitive sports. China's high jump developed fast from the year 1970s to 1980s, and many excellent high jumpers performed very well in the history of Athletics. However, with the old high jumper's retirement, the achievement of Chinese high jumpers is not developed for nearly 20 years. It is urgent to help Chinese high jump get out of this embarrassment.This thesis collects the literature from the year 1980 to 2009, and studies the technology and history of high jump. It also collects specifications of many excellent female high jumpers both home and abroad, and using three-dimensional video cameras hooting the competition of National Track and Field Championships which held in Si jiazhuang. It studies awing leg, swing arms and the supporting take-off foot according to the technology of high jump, Biomechanics and Exercise Physiology. And try to find the problem in technology of Chinese high jumpers and the difference between them and the high jumpers abroad, in order to raise reasonable suggestion. It also try to provide technology theoretical basis for Chinese high jumpers, so that they could get good achievement in the next competition.This thesis shows the study results as follows:1. In recent 10 years, the women's Fosbury flop is in its trough development both home and in abroad, and the achievement didn't improve. Although the achievement of women's Fosbury flop in China is improving, it's still far behind the world standard.2. The female high jumpers in China are obviously superior to those abroad in height, but are inferior to those abroad in H1 value. Before the moment of takeoff, the body center of gravity falls too low, and the Body-mass horizontal velocity is lost so mush that the supporting technology of swing leg is poor; At the moment of takeoff, the Downward vertical velocity acquired by the body is fast, but the conversion of horizontal velocity is so little that Body-mass fastest horizontal velocity is slow when the off foot off from the ground.3. Countdown to the second step of running up when the moment swing leg fall to the ground, the knee of swing leg bends to a large extent, but it buffers little; The swing leg doesn't stretch enough, and it shows that the muscles of Chinese high jumper's swing leg is not enough, either.4. At the moment of take-off, the swing leg of Chinese female high jumper swings fast but not enough. The direction of swing leg should be front and up, and it is not scientific when swings to the different side-arm. The swing leg should have a small swing angle, and the degree of angle should be negative correlation with body-mass vertical velocity when the off foot off from the ground(r=-0.466). As for the degree of swing angle, it needs further study.5. As for Chinese high jumpers, their arms swing slow, and the arms didn't swing to the take-off leg. The champion Zheng xinjuan didn't swing arms right for twice, and the technology and strength of Chinese high jumper should have more training.6. The Chinese female high jumpers take off short in time and fast in velocity, and the knee and ankle didn't stretch enough, and the strength is not enough. Their technology is far behind the outstanding high jumper in the world.