Research On The Sports Technical Characteristics Of Chinese Elite Female High Jumpers

ObjectivesBased on the data as the support,results oriented,study the athletes of the defects in the present technical aspect in our country,and put forward the improvement direction,to provide training reference for Chinese athletes and coaches,abundant high jump project kinematics analysis system in our country,for the future teaching by analyzing kinematic characteristics of deep,for future studies provide valuable kinematic parameters,in order to provide scientific theoretical reference for future special training,this paper studies the top 8 women’s high jump athletes in 2020 National Track and field Championships in sports technology,and summarizes the technical characteristics and personalized characteristics of elite women’s high jump athletes in China through kinematic analysis.MethodsMainly adopts video analysis method,mathematical statistics method,comparative analysis method,literature method and expert interview method,The top8 women’s high jump athletes in 2020 National Track and field Championships are taken as the research objects,and the technical parameters performed by the athletes in the run-up,take-off and flying over the bar stage are analyzed as the research content,obtain to our country elite female high jumper in active service movement technology characteristics.Peak Motus three-dimensional analysis system is used for video analysis,matsui’s human model from Japan is used,and linear DLT method is used for conversion,the original data is processed by data smoothing at 6Hz,the best jump related technical parameters of athletes,combined with the foreign elite female high jumpers in the same period,China’s elite female high jumpers in the early comparative analysis.Results（1）The take-off time of China’s elite female high jumpers is 0.16-0.17 s.（2）The ratio of the last two steps to height was 104.71%,93.63%,and the difference was11.08%.（3）The last two run-up speeds were 6.66 ± 0.17m/s and 6.45 ± 0.16m/s respectively.（4）In the take-off stage,the horizontal velocity was 6.38±0.26m/s,the vertical velocity was-0.10±0.16m/s,the relative velocity was-2.08±0.84m/s,the take-off Angle was 42.00°,the take-off velocity was 5.40m/s,and the horizontal velocity loss was 2.37m/s,vertical velocity increment 3.71m/s.（5）The hip,knee and ankle angles were 165.24±4.61°,162.72±4.92° and 141.29±4.99°respectively at the moment of take-off leg.The average angular velocity of swinging leg was792.04 rad/s.The fastest swinging leg was 996.16 rad/s,and the slowest swinging leg was only 629.33 rad/s.（6）The proportion of H1,H2 and H3 is 49.22%,66.58% and101.13%,respectively.The difference between the highest point of the center of mass and the bar is 0.07 m.Conclusions（1）In terms of the time parameters of the run-up stage,the take-off time of Chinese athletes is 0.16-0.17 s.Zhang Chunlu and Liu Yiwen have better take-off time.Except Huang Min,the take-off time of other athletes is slightly longer or the same than the contact time of the last two steps.It was found that the flight time of all the athletes with the last step was much shorter than that with the last penultimate steps.（2）In the step parameters of the run-up stage,the length of the last two steps of the Chinese athletes is smaller,and the step length of the last steps is smaller than that of the last penultimate step.The run-up mode belongs to the "big-small" mode.Compared with the world elite athletes,the length of the last two steps of the Chinese athletes is smaller and the difference is larger.（3）In the run-up stage of the speed parameters,Chinese athletes in the run-up the last penultimate steps of the speed is greater than the last step of the run-up speed,the last two steps of the run-up speed deceleration phenomenon.（4）In terms of the speed parameters of take-off stage,The horizontal velocity loss of Chinese athletes is 0.26m/s lower than that of foreign athletes,and the increment of vertical velocity is 0.76m/s lower than that of foreign elite athletes.Further analysis of the conversion coefficient shows that the speed conversion coefficient of Chinese athletes is 1.59,which is lower than that of world elite athletes1.73.（5）In the Angle parameters of take-off stage,The knee extension angle of Chinese athletes is lower than that of foreign elite athletes,and the extension ability of knee joint was not enough.（6）In terms of height parameters of take-off stage,the proportion of H1 of China’s elite female high jump athletes,which is higher than that of the world’s elite athletes 48.63% and H2 lower than that of the world’s elite athletes 68.87%,H3 lower than that of the world’s elite athletes 111.68%.The difference between the highest point of center and bar of Chinese athletes,which is slightly larger than that of world elite athletes 0.06 m.