Three-dimensional Kinematics Analysis Of The Take-off Technique Of Male High Jumpers In The 13th National Games

This paper USES literature,three-dimensional video analysis,mathematical statistics,comparative analysis and other research methods,with two sets of 3 d high-speed cameras to the scene of 2017 the 13 th national games men's high jump shot,with eight athletes before the game the best take-off technology as the research object.Of takeoff leg touchdown moment,maximum buffering moments,moments from the ground,buffer,stretching and complete takeoff stage six for athletes each link of the body Angle,speed,height of body center of gravity and time change indexes such as three-dimensional kinematics analysis.Results show that: 1.In the take-off leg touchdown moment,from the point of view of his left knee and left hip,athletes in our country the moment of takeoff leg is straight,landing on technology to do better,but there are individual athletes is kneeling on the ground.The knee joint Angle of the eight athletes is basically reasonable,and the leg folding technique is better.Upon examination,the jump on the higher moments of body gravity center,the performance will be better,at the same time,the body center of gravity height have a great relationship with the height,after investigation and athletes in our country and the world elite athletes height difference is not obvious,shows that the technology our athletes did better.2.From the point of view of the biggest moments of left knee joint buffer,eight athletes takeoff leg buffer is full,compared with the best athletes in the world the gap is not big,but smaller Sun Zhao knee joint Angle,not in track and field teaching material given range between 140 ° to 160 °,may be related to poor Sun Zhao lower limb strength.China's athletes have a higher center of gravity than the world's elite athletes,and the Chinese athletes have a better performance.3.In an instant,our country athletes takeoff leg joint Angle is small,Chinese athletes in the moment of takeoff leg stretching is not sufficient,the eight athletes leaps Angle only wang yu in 50 ° and 55 ° within a reasonable range,the remaining seven players buckled up small Angle.The higher the left ankle,the better the performance.The body weight of Chinese athletes is generally lower than that of the world's elite athletes,and only individual athletes reach the world level.At the same time,the height and height of the body weight have a great relationship with height,and it is not obvious that the height difference between China's athletes and the elite athletes of the world is not obvious.4.During the takeoff buffer phase,in addition to wang yu of other athletes left ankle Angle change is on the decline,according to the principle of the technology that wang yu in the left ankle motion technology existed unreasonable phenomenon.After examination,the vertical velocity of the left ankle and the vertical velocity of the right ankle were better.The shift of the center of gravity of Chinese athletes in the buffer stage is smaller than that of the world elite athletes.The gap between the buffer time of Chinese athletes in the jumping buffer stage is smaller,and the average time mean of Chinese athletes' buffer time is greater than that of the world elite athletes.5.Chinese athletes have less than the world's elite athletes in their hip,knee and ankle joints,and their hips,knees and ankles are not fully extended.8 basic reasonable,the speed of change in body weight of eight players and world elite athletes body center of gravity vertical stretching in short distance compare,our country athletes stretching in time compared to the outstanding athletes in the world stretching in time gap is smaller,and stretching in time is less than the buffer time,and the center of gravity of the vertical speed faster,our athletes in our country athletes stretching speed faster.6.Chinese athletes in complete takeoff stage of lower limb joint Angle change basic reasonable,upon examination,left ankle and right ankle value,the greater the vertical speed change the movement of the achievements,the better,our country athletes in complete takeoff stage of body center of gravity vertical displacement change gap is larger,and compared with the best athletes in the world the gap is not big,but there are individual athletes stretching distance is shorter.China's athletes are in a reasonable range of starting and jumping time,and are not far from the world's elite athletes.It is hoped that this thesis will provide references for improving the jumping technology of Chinese excellent men's high jump athletes.