Biomechanical Research For Joint Chains Of Upper Limb Whiplash Movement In Tennis Serve

Research purposes:To compare and analyze from two aspects,one iskinematics,the other is sEMG.It is based on serce action of differentmovements level tennis players.By analyzing the Biomechanics of thedelivery of service data,derivation of upper limbs with joint chainsmodel.To rich whipped biomechanical laws providing theoretical basis ofaction.Research methods:This paper adopts PTI three-dimensional motioncapture system and wireless BTS surface electromyographyinstrument,collecting serving data acquisition of different movementslevel tennis players. Test delivery of service in the torso and right armof kinematic parameters, and parameters of surface electromyography ofthe trunk and upper limbs muscles on the right side.Research results:Kinematic data show that the correctly serviceaction,speed gradually from the proximal joint to the distal joint,thenthe momentum transfer to the racket, the racket to obtain maximumspeed.sEMG trapezius muscle and the anterior bundle up earlier and havelarger amplitude.Research conclusions:Acceleration of the trunk and upper extremitiescan be divided into two parts,one is part of torso--shoulder--upperarm,the other is part of upper arm--forearm--hand--racket. Hitting theswing phase,angle between torso and upper arm is not180°,illustratethe trunk turned to the opposite side so as to balanced of gravitycenter,the forearm stretch to shot. Shoulder,trapezius muscles and theanterior bundle of deltoid activation is earlier and more obvious；Elbow,to strengthen the antagonistic muscle--biceps and triceps；Trunkmuscle，pectoral muscle power significantly，beginners need to developits antagonistic muscles--latissimus dorsi muscle，coordination with thepectoralis major antagonistic role.