| Research purposes: based on the different level of badminton players(level 1,level 2,grade 6)backhand high technology for kinematics analysis,understand the backhand high technology parameters characteristics,in the process of the different level player hit the ball and kinematic characteristics of the change and difference,analysis the reasons of the change and difference as far as possible,the kinematics of badminton backhand high technology research to supplement and perfect,and enrich the study of whiplash theory.Research methods: this study on the three levels(level 1,level 2,grade 6)right hand holding the male athletes with general mark point marker(35),with 8 camera Motion infrared high-speed Motion capture system of markers in kinematics data collection,and use Motion Analysis with data acquisition and processing software Coretx all landmark recognition,export all the coordinates of points and the level of kinematic data,space vector to calculate the secondary data of the related level of kinematic data.This study by hitting a backhand high ball player hand speed variation characteristics in the process of the high ball backhand technology into mobile take a stage,and swing the racket back stage,three phase,and adopts the method of single factor analysis of variance for each stage three level athletes for the center of gravity,lower limbs,trunk,and upper limb kinematics data contrast analysis.Results: with the increase of movement level,the overall time and swing time of technical action are significantly shortened.Significantly reduces the gravity center,center of gravity variation at various stages,hip Angle,supporting leg knee flexion Angle,ankle dorsiflexion Angle,mobile position stage right upper limb Angle of each link and change,the racket back stage torso right Angle variation,the racket back stage left shoulder abduction Angle,the speed of the swing phase of shoulder joint,hitting moment torso left-hand Angle;Significantly increased in different stages of the supporting leg knee flexion Angle,mobile position phase torso right Angle,the racket back stage left shoulder the swing Angle and swing phase your right elbow,right wrist and hand speed,swing phase shoulder swing Angle was,shoulder Angle,Angle,rotation Angle,shoulder joint angular velocity,elbow joint angular velocity,shot moments torso left angular velocity.With the elevation of the athlete’s level,the earlier the movement change of the trunk,the earlier the maximum angular velocity of elbow in the swing stage,and the later the maximum angular velocity of shoulder and elbow.The center of gravity is at the height of the swing when the center of gravity is falling,not the highest point of the center of gravity.Conclusions: 1.The higher the level of the athletes,the shorter the total time of the technique,and the more significant the difference in the time of the swing stage,the more efficient and short the higher the level in the completion of the action.The higher the athlete’s level,the lower the center of gravity and the smaller the amplitude change.The higher the athlete’s level is,the more he or she will bend his or her knees to lower the center of gravity.The higher the athlete’s level is,the more he or she will bend his or her knees to lower the center of gravity.The lower the level is,the more he or she will bend his or her hips to lower the center of gravity.Lower level athletes are more likely to use hip flexion way to drop the center of gravity.2.The higher the level of the athletes,the earlier the start of each part of the movement in the position taking stage and the racket drawing stage,the smaller the movement range,the larger the hip Angle and the smaller the knee Angle are,the better the stability of the body.The lower limb and the right upper limb muscles of the non-supporting side are relaxed.The better the player,the faster and more accurately he responds to the ball.3.The higher the level of the player,the greater the change of the Angle of the right upper limb in the swing stage,the later the maximum angular velocity appeared,and the greater the angular velocity value at the time of hitting.The variation of swing stage indicates that the more efficient the action is as the level increases.4.When hitting the ball,the height of the center of gravity is in the falling period of the swinging stage,instead of the highest point of the center of gravity.The hitting moment occurs after the maximum speed and angular speed of each link of the right upper limb in the swing stage.5.The backhand high ball technique of badminton belongs to the upper-limb whipping movement.Although there are differences in the timing of trunk and right upper limb movement in the swing stage of each level athlete,they all conform to the upper limb whipping movement principle. |
