Biomechanical Analysis Of "811" Movement Of Trampoline Athletes In Shandong Province

Objective:The elite Trampoline Athletes of Shandong Province "811" technical movement kinematics,dynamics and characteristics of surface electromyogram of research,analysis of elite trampoline athletes at the completion of the take-off,the variation features of sports biomechanics and twisting in the falling process.The purpose is to assess the trampoline athletes do "811" technology action,take-off,different heights of the whereabouts of the stage,lower extremity pressure net,hauling moment of force changes,through a combination of kinematics,EMG parameters of sEMG analysis,based on the comprehensive evaluation of trampoline athletes pressure net,hauling technical characteristics,and analysis of jumping bed athletes to complete the "811" action at each stage of the kinematic characteristics of proposed scientific experiments to test data.Research meaning: Through the use of sports biomechanics testing instruments and methods,of excellent trampoline athletes completed "811" technological action process tracking synchronization test,and the principles of sports biomechanics,diagnosis and analysis of the characteristics of technical movement and to investigate the trampoline "811" action law of connection and athletes in pressing the net,hauling,and jump,twist in the air movement mechanics characteristics,to reveal the Trampoline Players "811" biomechanics characteristics,improve trampoline athletes technical level of action proposed analysis of the theoretical basis.Research methods:The contents of the experiments consists of the following parts:experiment a,kinematics analysis of Shandong Province Gymnastics Sports Management Center five trampoline athletes "811" technology action by biomechanics research methods.Experiment 2,using plantar pressure test method and table facial electrical measurement of five men trampoline athletes wear measuring device,lower extremity pressure net,hauling the strength test,and synchronization iscomplete on lower limbs' different muscles sEMG signal,kinematics parameter monitoring.Results: 1.In the allocation of time,"811" technology action vacated for the longest time,time pressure is slightly larger than that of TiC hauling time extension.2.Pressing the net stage,small changes of the whole hip joint,and knee,ankle range of change obvious.Ankle joint stability athletes body support,knee joint in the whole process of pressing the net,for athletes reduce body centre of gravity height plays an important role.3.Tic extension hauling process,athletes are overweight,ankle change more obvious,hip joint,knee joint were relatively stable,maintain body balance of take-off from to the key role.4.In the pressure network,step up and take off stage,the two head of the femoral muscle and the four head of the muscle as the main force of the muscle.Pressing the net,hauling of lower limb in different stages of foot measuring force variation characteristics display.The maximum pressure take-off stage of pressure,falling pressure phase,second,a pre jump stage and buffer stage less stress and flight phase force.5.The trampoline "811" action in the air straight,pike flip when changes in the knee joint angle changes,the second largest of shoulder joint,hip joint angle changes is the smallest.Conclusions:1.Through the kinematics analysis of elite Trampoline Athletes of Shandong Province "811" action,be divided into the following several stages,namely:the whereabouts of OCS,pressing the net phase I,stretching in the second stage,hauling in the third stage,vacated IV stage.In the entire process of the "811" movement is composed by: from the ready position,pre jump,finally pre jump and straight forward jump,in the sky to complete straight,pike flip,and then falling.And with the help of rebound buffer,until the last drop,stable stop link.2.Trampoline Athletes in pressing the net,pedal,hauling stage,ankle,knee,hip tomaintain a moderate speed,the take-off to maintain body balance play to the key role.3.Through the analysis of the kinematics and surface EMG synchronization during the stage of the take-off pressure,the main force of the muscle is the two head of the muscle and the four head of the thigh when the athlete's pressure network takes off.4.Trampoline take-off pressure foot by maximum strength,athletes,through the network of maximum force pressure through the elastic of the trampoline gain speed and height,to provide protection for the completion of the action in the air.Once again pressure voltage power network times,by the influence of acceleration of gravity,the athletes falling net foot bear a larger force.5.The trampoline "811" action in the air straight,pike flip knee joint,shoulder joint angle changes larger,to accelerate the drive athletes the whole body forward somersault in the air and the completion of a twist in the air of action,provides the body rotation speed.