Kinematical Analysis On The Technical Movements Backhand Pull Down And Spin The Ball Of The Elite Athlete Liu Shiwen

Research purposes: The aim of this paper is to photograph and analyze the technical action of Liu Shiwen by pulling down the rotating and rotating balls through eight high-speed cameras.The kinematic parameters are obtained by motion analysis software.The kinematic characteristics of upper limbs,torso and lower limbs are analyzed,and the movement law of Liu Shiwen's technical action is revealed.Through the study,it is expected that the training of the reserve talents of table tennis will be detailed and objective data reserve.Law "of the athletes to provide reference.Methods: In this study,Liu Shiwen,an excellent athlete,has been studied by means of literature,expert interview,kinematics test and analysis,mathematical statistics,and the technical parameters of the spin and ball are deduced,mainly through the time parameter,space Parameters and the angle of the joints and other data to resolve.Conclusions:1)Liu Shiwen backhand pull the ball in the technical action cycle,the shooting stage and swing the ball stage with more time,accounting for a large proportion;with the stage with the least time.3)Liu Shiwen backhand pull the ball in the action cycle,the shooting stage and the reduction phase with more,accounting for a large proportion;hit the stage with less,the smallest proportion of this moment instantaneous acceleration.Suggestion:1.In the juvenile table tennis training,rapidly strength in the promotion of women's football,backhand down spin and topspin can with the action of liu shiwen technology as a template,will improve the training efficiency.2.Analysis of the techniques of excellent athletes should be more biomechanical testing,set up key action template and database technology,for athletes training,monitoring and diagnosis of the techniques of lay the foundation.3.Liu Shiwen hand pull down the spin ball technology shows "women play masculine" features,through the lower limbs pedal extension,torso twist and upper limb "whipping" action,the final energy transfer to the racket,power concentration,explosive power.4.Liu Shiwen backhand spin ball technology in the power there is room for improvement,need to improve the control of the ball rotation and pressure arc ability.Pull the ball on the ball technology,Liu Shiwen upper limb muscle relaxation,action quickly,hit the ball when the power,make full use of the lower limbs and trunk power.