Kinematics Analysis Of Open-handed Footwork In Tennis Hands

The world’s best professional tennis players use open footwork in the game,and the open footwork is more suitable for the wide-angle running strokes of the bottom line because of its faster moving speed and more rotation of the ball.The development of tennis skills and tactics.In this study,the kinematic parameters of the open-handed approaching method of the two-handed backhand are studied,and the corresponding joint kinematic data of the trunk and lower limbs are obtained.The characteristics of the body posture in the whole action stage of the open-step method of the two-handed backhand are explored and revealed.Comparing with the law and comparing the differences in technical characteristics of different genders can provide a biomechanical basis for further improving and enriching the basic knowledge of tennis.It can also provide some data support for the study of lower limb injuries in tennis in the future.In this study,tennis two-handed back shots were used as the research object,and the subjects selected 10 tennis special secondary athletes from Sports Institute.In the study,the actual hitting situation under hard ground conditions was simulated,using infrared camera capture system(UK,VICON,8 cameras,sampling frequency is100Hz)and Swiss KISTLER three-dimensional force table(length: 60×40cm,sampling frequency)It is 1000 Hz,built-in signal amplifier)??Synchronously collects the kinematic data of tennis players’ backhand shots with open hands,using the system’s own analysis software and tools such as Excel,SPSS 23,Origin2016 and GraphPad Prism 6 for post-processing and analysis..This study draws the following conclusions:(1)The backlash of the two-handed shots is more than the stretch period.The men spend more time than the women.The athletes have sufficient preparation time before hitting the ball,so that they can get a greater hitting speed and improve the hitting when hitting the ball.Ball quality.The knee flexion time is relatively long during the entire support phase,and the body pressure is large,which is prone to joint damage.(2)In the buffering stage,the body lowers the center of gravity by bending the knee,and the center of gravity is forwarded by the positive rotation of the hip joint,which can improve the hitting speed and quality and generate greater explosive force.Men’s center of gravity is more conducive to the transmission of power.(3)In the stretching stage,the angle of the left shoulder joint is increased,the internal rotation of the arm is performed,and the angle of the left elbow joint is reduced,which is beneficial to improve the control of the ball.(4)The order of force in the whole supporting stage is: ankle→knee→hip,torso torsion,shoulder→elbow→wrist,which will facilitate the transmission of strength and obtain a greater hitting speed.