Study On The Foot Pressure Distribution And Dynamics Of The Take-off Technology Of Three Elite Male High Jumpers In Beijing

The research object of this paper is the takeoff technique of elite male high jumpers in Beijing.The basic research methods of this paper are kinematics and dynamics measurement,documentation and mathematical statistics.By setting up modern sports scientific measuring instruments for the research samples,the relevant data of takeoff time,plantar pressure distribution and so on are obtained and analyzed.The takeoff techniques of three elite male high jumpers in Beijing were tested by high-speed video shooting,plantar pressure system and three-dimensional force measurement system.Based on the current analysis parameters,statistical analysis is carried out for the original data.The purpose is to help athletes and coaches effectively understand the mechanical characteristics and basic rules of takeoff techniques,and to facilitate comparison with the world’s outstanding athletes with different training backgrounds.The assistant coaches deepen their cognition in the aspects of analysis technology and training plan formulation,so as to make more targeted treatment strategies,improve the athletes’ performance,strengthen the training effect,and effectively avoid the problems easily occurring in sports,reduce sports injury,and provide good data indicators.Based on the above analysis,the paper draws the following conclusions:1 The order of the center trajectory of the takeoff foot of the elite male high jumpers in Beijing is: the lateral heel the middle foot the second-third metatarsal the second-third metatarsal the second-third phalangeal the second-third phalangeal bone,which should be a smooth curve as a whole,and the swing amplitude of the left and right is relatively small.The center of gravity trajectory is moved from the lateral heel to the middle of the foot and the inside of the foot.If there is a more obvious "corner" in the process,such a situation will easily lead to the athletes take-off is not smooth and the athletes’ body center of gravity stagnation.2 The peak pressure of the three elite male high jumpers in Beijing was mainly concentrated in the medial heel area(HM),and reached the peak point at the instant of takeoff,with an average time of 7.2%.The athletes used the "rolling" takeoff technique as the takeoff technique.The takeoff technique had good stability.Take-off time is too long,pay too much attention to take-off,make take-off speed slow,is not conducive to the high jump in the horizontal movement of force to the vertical movement of the transformation.3 By calculating and analyzing the pressure on each area of the sole of three elite male high jumpers in Beijing during takeoff and the order of its magnitude,it is concluded that the largest part of the accumulated pressure is the middle metatarsal area,which indicates that the middle metatarsal area is more stressed during takeoff and the area with the smallest accumulated pressure is the inside.The arch of the foot.From the order of the maximum pressure of each region,the first four regions are: medial and lateral heel region,middle metatarsal region,the last four regions are: medial arch region(MF),big toe region(T1-5).These data strongly support that the "rolling" take-off action is more in line with the laws of human movement,in daily training using such take-off action,more conducive to athletes to effectively improve performance.4 The characteristics of Fx positive and negative peak forces of three elite male high jumpers in Beijing are as follows: the force of negative peak is much greater than that of positive peak,indicating that the force of backward is much greater than that of forward.In addition,the force value in the horizontal braking stage is significantly lower than that in the pushing and stretching stage,indicating that the takeoff process will be affected by the braking,the horizontal braking force needs to be transformed into the vertical force,so as to improve the performance.There is a significant positive correlation between the valley valleys of the three athletes and their high jump performance.Therefore,the better the support ability of athletes,the greater the support force value,the greater the trough value,the more likely to play a better performance.