| Research Objective: In this study,8 national second-level athletes and special students of badminton in Xi’an Physical Education University were selected as the experimental subjects,all of whom were males with right-handed racket.In this study,three-dimensional kinematics analysis was carried out on the upper limbs of the two groups of students using the method of literature,expert interviews,experiments and mathematical statistics.This study aims to explore the influence of non-clapping arms on the swinging arm when jumping and killing balls,and also provide a certain theoretical basis and practical reference for the badminton teaching of college teachers.Research Method: In this study,two SONY DSC-RX10M4 telephoto black card digital cameras with a shooting frequency of 100 HZ were used to shoot the subject’s foot jumping ball killing technology,and the captured video were imported into Sim motion（human motion video analysis system）for analysis.Study results:（1）The killing scoring rates of the second-level group and the special group were 71%,54%,and p<0.05,respectively,the difference was significant,the second-level group had a higher killing score rate,and the differences among right elbow,right wrist,right hand and racket speed between the second-level group and the special group were significant and p< 0.05.（2）The time interval for the shoulder and elbow,elbow and wrist,wrist and hand on the left side to reach the maximum speed in the secondary group were:0.01 s,0.01 s and 0.00 s,respectively;in the task force groups were: 0.05 s,0.02 s,-0.10 s,it can be seen that the left arm force timing of the secondary group was: hand-wrist-elbow-shoulder,the task force was:wrist-elbow-shoulder-hand,and the maximum speed of each joint in the secondary group was greater.（3）From the left and right arm velocity,angular velocity,angular velocity curves,it can be seen that the left arm exerted the first force to drive the swing force of the right arm,and the angle of the left and right elbow joints showed the opposite movement trend,and the right elbow joint angle showed a gradually increasing trend in the smaller and smaller left elbow joint angles.（4）In the preparation stage of the squat,the same movement trend appeared in the left and right arms.At the end of the squat,the center of gravity of the secondary group was lower,and the joints of the left arm showed a state of smaller speed and angle.In the starting and jumping stage,whether it was a special group or a secondary group,there was a certain correlation between the upswing of the left and right arms and the pulling speed,angle and angular velocity,and the correlation coefficient between the left arm swing speed and the racket speed of the secondary group was closer to 1,p<0.05.There was a significant difference between the secondary group and the task force group in the swing speed and pull-down angle speed of the left arm,at p<0.05.At the stage of swinging and hitting the ball,there was a significant correlation between the secondary group and the special group in terms of the speed and angle of the left and right arms,while the secondary group had a significant correlation between the angular velocity of the left and right arms;The difference between the pull-down angular velocity of the left elbow joint of the two groups was significant,at p<0.05.（5）The time interval between the force of each joint of the left shoulder,left elbow and right arm was higher and the speed correlation of the right wrist and right hand was higher and showed a significant positive correlation.The correlation between the time interval between the force of each joint of the left wrist,the left hand and the right arm and the speed of the right wrist and right hand were more correlated in the secondary group and showed a significant negative correlation.（6）On the pull-down trajectory of each joint point of the left arm arm of the secondary group and the special group,the left arm of the second-level group was better than the special group in terms of the pull-down length and the maximum pull-down speed of the shoulder,wrist joint and hand link.Research conclusions:（1）The timing of the left arm when the foot jumps to kill the ball is: the hand-wrist-elbow-shoulder force is more coordinated and is more conducive to promoting the transmission of the speed of the right arm.The angle of the left arm before taking off is reduced,and the limb is more likely to accelerate upwards;After the take-off,the angle becomes larger,and the limbs are more likely to maintain balance in the air;Its forward extension plays an equally important role as flexion.The left arm exerts the first force to drive the joints of the right arm to accelerate and brake in turn to produce a better batting effect.Rapid flexion of the left shoulder and left elbow promotes rapid forward extension of the right shoulder and right elbow.（2）When the left arm and wrist joint of the left arm and wrist reach about77.61 ° /s in the stage of preparation for squat preparation,it is more conducive to taking off.In the jumping and shooting stage,when the flexion angle speed of the elbow joint of the left arm reaches about 454.53 °/s,it is more conducive to the top elbow of the right arm and the backward inversion of the racket.In the swinging and hitting stage,when the angle of the left elbow flexion stage reaches about 73.91 °,it is more conducive to the forward extension of the right arm to hit the ball,and when the left elbow flexion angle speed reaches about 551.09 °,it is more conducive to the opening and extension of the right arm shoulder,elbow,wrist joint angle Finally makes the racket speed faster and the better the hitting effect.（3）When the time for the left shoulder and left elbow to reach the maximum speed is longer with the time interval between the right shoulder,right wrist and right hand to reach the maximum speed,the more conducive it is to the accelerated swing of the right shoulder,right wrist and right hand,which ultimately makes the racket faster;The time between the left wrist and the left hand to reach the maximum speed and the time interval between the right shoulder,right wrist and right hand to reach the maximum speed is shorter,which is more conducive to the power of the right arm so that the racket can exert greater speed.（4）The trajectory of the left arm shoulder,wrist and hand downward flexion is about 0.39 m,0.78 m and 0.90 m,respectively,which is more conducive to the swing of the right arm,and finally makes the swinging speed when hitting the ball faster. |
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