The Three-Dimensional Kinematic Analysis On High Jump Technique Of Domestic Female Elite High Jumper Zheng Xingjuan

Zheng Xingjuan is the national sports team female high-jumper, but no research about her high-jump technique have been reported up to the present. Carrying on the kinematic analysis to her high jump technique is helpful to her technique improvement and training improvement. The female high jump finals video recordings of Zheng Xingjuan in '2007 national track and field grand prize contest (Suzhou stands) ' were analyzed using the German SIMI-motion video recording analysis system, then compared with the datum of the domestic and foreign female elite athlete's. Some conclusions were drawn: (1) The length stride of penultimate was actually too high, it caused the approach rhythm insufficiently to be reasonable, and affected the approach speed maintenance of the last stride. The body center of gravity was to be high when the take-off leg touched with ground, affected the engagement of approach and take-off. (2) The vertical instantaneous velocity was positive when the take-off leg touched with ground, caused by up velocity of the center of gravity due to body leans was quick than the down velocity of the center of gravity when the take-off leg touched with ground. The level velocity of the approach dropped from the third to the last, the last's was lower than the domestic and foreign elite athletes.(3) The cushion was not fully used in take-off, the height of H₁ was lower though she have a higher height. The vertical velocity was lower and the swinging effect of the arms and the leg was worse in take-off. (4) The technique of passing over the bar was reasonable, unfolds the hip was full, the succession was good, the H₃ value surpasses the domestic and foreign elite athletes, but there were some deficiency, such as the quicker level velocity at take-off, the velocity and time of extending the knee on the bar, affected the steadily during her passing bar. (5) The inclination angle stability was worse from the third to the last of approach, the approach speed tended to low when the height of the bar was high. Compared the parameters of the cushion time, the cushion angle and the angle of departure , it could be discovered that the technique of take-off was not steady, so her technique have not grown up.