| Research objectives: From the perspective of kinematics,this study analyzed the kinematic parameters such as joint Angle,speed,center of gravity displacement and racket motion trajectory of 4 domestic elite male tennis players in the swing stage and the swing stage of forehand high stroke technique,and compared and analyzed the movement differences between their forehand high stroke and conventional stroke.This paper reveals the kinematic characteristics of forehand high shot technique and provides guidance for tennis coaches to teach forehand high shot.Research methods: The high-speed camera is used to collect the players’ batting action video,the video is analyzed by the video parsing system to obtain the spatial coordinates of the human joint,the space coordinates are analyzed by Qualisys Track Manager to obtain the required motion parameters,and the Excel2016 is used for statistical analysis.Finally,SPSS 20.0 was used to conduct paired sample T-test on the kinematic data of forehand high shot and forehand conventional shot,analyze the kinematic differences between forehand high shot and conventional shot,and obtain the technical action points of forehand high shot.Research results:1.At the end of the lead stroke,the P values of hip Angle,trunk Angle and shoulder Angle of the non-holding side of the forehand high position and the conventional shot were less than 0.05,showing a significant difference,indicating that the relevant data of the high position shot was greater than that of the conventional shot,and the other joint angles P to greater than 0.05,showing no significant difference.2.The knee joint Angle curve of the holding side of the forehand high position shot is steeper and more varied than that of the conventional shot in the front swing stroke;The vertical displacement of the center of gravity is larger,the left and right displacement is smaller,and the front and back displacement have no significant difference.3.At the moment of hitting,the adduction and abduction Angle and flexion and extension Angle of shoulder joint on the holding side of forehand and conventional hitting,as well as the height of shoulder joint on the holding side of forehand were less than 0.05,which showed that the data of high hitting was greater than that of conventional hitting.4.At the end of the swing,the P value of trunk Angle and the line between shoulder and hip of forehand high position and conventional stroke is less than 0.05,which has a significant difference,in which trunk Angle shows that forehand high position is less than conventional stroke,and shoulder and hip line shows that forehand high position is more than conventional stroke.Research conclusion:1.Forehand high shot at the end of the lead stroke has a greater degree of trunk uprightness than conventional shot,and a higher elbow joint on the non-holding side.2.The push extension of the knee joint on the racquet side is faster and larger than that of the conventional shot in the forehand high position stroke stage;The shoulder height of the racket side is significantly higher than that of the conventional shot.The center of gravity displacement is less in the left and right direction,more forward and upward.3.High position forehand shot at the moment of hitting,the elbow joint on the racquet side is slightly higher in height and more forward than the conventional shot,and the hitting point is higher and more forward,which requires higher strength of shoulder muscle on the racquet side.4.At the end of the swing,the upright degree of the body of the forehand high shot is smaller than that of the conventional shot,the body tends to be on the non-holding side,and the rotation range of the shoulder and hip is smaller than that of the conventional shot. |
