Biomechanical Study On Rotating Serve Technique Of Male Tennis Players

Objective:The rotating serve technical movements of 6 tennis players were collected by JVC high-speed camera,analyzed by Simi-Motion three-dimensional video analysis system,and the kinematic parameters of 6 tennis players were quantified.This paper analyzes and summarizes the technical action laws reflected by each parameter,which provides reference for the research of tennis rotating serve technical action,and provides theoretical guidance for the teaching and training of tennis rotating serve technique.Help students or athletes to complete tennis rotating serve skills more scientifically and effectively.Methods:In this study,six tennis players from the Graduate School of Shandong Institute of physical Education were taken as the research objects.Four Nissan JVC-GC-PX100 high-speed cameras are used to collect the technical movements of upward serve and side serve of six tennis players,and Simi-Motion 3D video analysis system is used to analyze the collected video.The kinematic parameters of tennis players in the process of serving are analyzed and sorted out.Results:In the lead stage of throwing ball,the parameters of the height of throwing point and the maximum velocity of throwing ball are larger than those of upper rotation serve technique,while the upper rotation serve technique is larger than that of lateral rotation service technique,while the ankle joint angle is larger than that of upper rotation serve technique.In the swing batting stage,the parameters of shoulder joint angle,elbow joint angle,wrist joint angle,hip joint angle,left knee joint angle and left ankle joint angle were larger than those of lateral rotation serve technique,while the values of height of center of gravity,right knee joint angle and right ankle joint angle were lower than those of lateral rotation serve technique,while the parameters of shoulder joint angle,elbow joint angle,wrist joint angle,hip joint angle,left knee joint angle and left anklejoint angle were larger than those of lateral rotation serve technique.At the time of swing,the height of the hitting point,the height of the center of gravity,the height of the head,the angle of the right shoulder and the angle of the knee are larger than those of the lateral rotation,while the flying speed of tennis,the angle of the right elbow,the angle of the hip and the angle of the ankle are smaller than those of the lateral rotation.In the stage of landing buffer,the right hip angle,right knee angle and right ankle angle of the upper turn serve are smaller than that of the lateral rotation service;The left hip angle,the left knee angle,the left ankle angle is larger than the side-turn serve,which means that the two players have the opposite inclination angle when buffering.Conclusion:In the pitch stage,the upper limb movements of the two serve techniques are basically the same.However,the lateral serve technique is faster and the flexion amplitude of the left ankle is larger,and the flexion amplitude of the right knee of the upper spin skill athletes is larger.In the swing stage,the other parameters of the two serve techniques are basically the same except that the changes of the wrist joint angle and the hip joint angle of the athletes are inconsistent.Therefore,when the two serve techniques serve,the wrist control racket is mainly used to change the rotation of tennis.In the landing buffering stage,the athletes choose the left foot to fall to the ground first to bend the knee buffer force in both serve techniques,and the shoulder joint angle and elbow angle of the player in the upper rotation serve technique.The amplitude of the song is large.