Kinematics Comparative Analysis Of ATP Athletes And Young Athletes' Serve Skills

Serve is the starting point of the game and is completely controlled by the opponent.It is an important means of attacking the score of the athletes in tennis.The scoring rate is as high as 30.33%.In the professional tour,men's singles athletes has 50 to 150 servings per game,serving become one of the most frequently used technical movements for athletes.This study mainly uses three-dimensional video analysis method to compare the kinematics parameters of serve technology of men's tennis players at different levels.And we drawn conclusions as follows:(1)Throwing the ball and lifting the racket stage:at the moment when the ball leaves the hand,the shoulder angle of the throwing arm of ATP athletes is greater than that of teenagers;the elbow joints of players at different levels are stretched straight at the moment the ball leaves the hand,when the ball leaves the hand,the hip angle of ATP players is smaller than that of teenagers,and the height of the ball from the hands of athletes of different levels is higher than their own height;the highest point of ball toss of ATP players is higher than that of teenagers;at T2,the knee angle of ATP athletes is less than that of teenager athletes,and the angle of Geller's knee is relatively large.Among them,the angle of the left knee joint of 5 athletes was less than that of the right knee joint.ATP athletes' holding and clapping arm and shoulder pulling action is more obvious than that of teenage athletes,among which Rutherwali's shoulder angle is too large,and Geller's shoulder Angle is too small;ATP athletes with elbow angle in a reasonable scope,adolescent athletes elbow angle is not ideal,the Rutherwali's elbow Angle is small,Wu Yibing's elbow angle is bigger.(2)Back bow movement stage:ATP athletes' stretching range of right and left knee is greater than that of young athletes,and the stretching range of left and right hip is also greater than that of young athletes.at T3,the shoulder angle of ATP athletes is larger than that of teenagers,and the elbow angle is smaller,the shoulder and elbow velocity of teenager athletes are all higher than that of ATP athletes,indicating that they can swing back faster.(3)Quick hitting stage:At the time of T4,the ATP athlete's arm shoulder angle is larger than that of the young athletes,the elbow joint and the wrist joint of the athletes at different levels are relatively straight;the left and right knees of the athletes are obviously stretched,the right hip angle is larger than the left hip angle,,the left and right hip angles of the young athletes are larger than the hip angle of the ATP athletes;the ratio of the hitting height of the young athlete to the height is greater than that of the ATP athlete;At T4,the speed of young athletes is faster than that of ATP athletes.Among them,Wu Yibing and Rutherwalihave a faster pat,especially Wu Yibing's tempo reaches 27.56m/s.different levels of athletes shoulder hip rotation is full,and Geller's rotation amplitude is larger.(4)Follow-up stage:Athletes of different levels have sufficient shoulder and hip rotation.In T5,they use hip flexion and knee flexion to complete the buffering action.At this moment,Geller's lower limb flexion angle is too large,which is not conducive to the rapid start of the body,and Trojorgi's lower limb flexion angle is too small,they had obvious closing and closing movements after hitting the ball,and the holding arm was swung to the left side of the body.(5)Summary:We found that serve technology of teenagers are chasing the player of ATP,some teenagera have better serve performance than ATP athletes,especially Wu Yibing and Rutherwali in the fastest speed for different levels of the athletes.;reasonable service technique pattern is the basic guarantee to improve the technique.Only a technical pattern in line with the laws and principles of sports biomechanics can enable athletes to develop their own personal best technique.