Technology Of Men's Secondary Jumpers And Study On Muscle Force Characteristics

After the Olympic Games are included in the Olympic Games,back style high jump quickly becomes a very popular and highly audience track and field event.With the change of the times,high jump technology is also constantly developing and changing,back style has become one of the most advanced high jump technology in the world.In recent years,experts have studied a lot of back style.However,they are mostly high-level athletes,ignoring the two level athletes at the grassroots level,especially for athletes in Colleges and universities.It is precisely because the colleges and universities have built teams in succession,and strengthen their training,and give the national team a batch of outstanding talents.Therefore,the good selection,training and competition of colleges and universities has become one of the most important components to improve the level of competitive sports in China.In addition,most of the expert studies mostly choose a single perspective to study kinematics,dynamics,and muscle electricity,and lack the combination of the three.This study selected two athletes of track and field team high jump Sport College of Shanxi University in 3,to ensure that no strenuous exercise situation before the experiment,using Vicon 3D motion capture system and four force and surface EMG acquisition instrument,three machine a method of three subjects after the comprehensive analysis of the whole take-off.According to the principle,biomechanics principle and other related knowledge comprehensive analysis.This paper tries to compare the differences between athletes and elite athletes at the technical level of our school,so as to give some theoretical support to the future scientific training.Including the main indicators of the study: the start moment of the body center of gravity height and speed in the hip knee ankle angle,the take-off time to complete,from the instant speed and angle of the take-off leg;by force in different directions;start and end time of the muscle EMG,muscle EMG RMS amplitude the EMG muscle values etc.In this paper,the following conclusions are drawn through the methods of literature,experiment,logical analysis and mathematical statistics.(1)At the beginning of the take-off stage,the vertical velocity of the body weight of the three subjects decreased,which may be related to the strength of the legs and the longer step length of the first leg.The horizontal velocity of the body's center of gravity keeps a relatively stable value,but it still has a big gap with the outstanding domestic players.The height of the center of gravity of the participants is higher than the maximum buffer time of the swinging leg,which is unfavorable for increasing the distance of the kick and affecting the effect of completing the action.(2)During the take-off process,the knee angle of the three subjects is in the buffer stage,that is,the instant to the maximum buffer moment of the take-off leg.Besides the field,the other two people are in a reasonable angle.Tian xx,because of the lower knee angle,caused the buffer to be blocked,and can not be over to the next stage.After the center of gravity passes through the vertical plane,the knee angle of the three people is not fully pedaling,which is not conducive to rapid vacant.(3)Three subjects were less than excellent athletes in China because of the lack of strength in the leg and the flexibility and strength of the ankle joint.If you don't push enough,you will slow down the vertical speed.At the same time,the driving of the swinging leg and the arms will also help to get out of the ground quickly.(4)The total time of take-off of three subjects was longer than that of excellent domestic sports.It is mainly reflected in the period of buffer stage and pedaling stage,which is longer than the excellent athletes in China.The buffer time is long,and it is not good for fast pedaling.When the distance is constant,the longer the pedaling,the slower the speed of the pedal.This has a great relationship with the strength of the athletes,especially the leg related muscles.(5)The vacant angle of the three subjects is not very different from those of the elite athletes in China.The subjects of the sports level anddomestic elite athletes than the gap between the obvious,but the jump of three people is still relatively good,strong stability,everyone has their own fixed jumping angle.There is no significant difference compared with the excellent players in China.(6)Three subjects' technical movements were well established,and the counterforce curves in different directions remained highly consistent,which had a great relationship with their long training.(7)There was a certain regularity in the muscle electromyography characteristics of the three subjects.The order of the start of the starting leg muscles is: the two head of the femur,the gastrocnemius,the soleus,the medial femoris,the lateral femur,the gluteus maximus and the rectus femoris.The order of the end of the take-off leg muscles is: soleus muscle,gluteus maximus,lateral femoral muscle,medial femoris,gastrocnemius,rectus femoris,and two muscles of the femoral head.The muscle contribution rate is small to large in turn: soleus muscle,gastrocnemius,gluteus maximus,rectus femoris to the lateral femoris to the medial femoris,and two muscles of the femoral head.