A Comparative Analysis Of The Swing Flexion And Extension Techniques Of The Single And Parallel Bars In Competitive Gymnastics

Research purposes:This paper aims to use biomechanical techniques to analyze the biomechanical analysis of the kinematics and surface electromyography characteristics of the first-line gymnasts in Shaanxi Province in the horizontal bar and parallel bars,and to describe the appearance characteristics and limb movement rules of the movement technique.Therefore,a sports technology model for such actions is established,which provides a scientific quantitative reference index for the technical movements with the same core technical elements and a scientific quantitative reference index for improving the quality of the technical actions at each stage of the action;for the gymnastics teachers,scientific and reasonable It provides theoretical basis for guiding the teaching and training of "post-swing flexion and extension" movements,and provides theoretical support and technical reference for gymnastics athletes at all levels in China to improve their sports performance and guide the scientific training of gymnastics enthusiasts.Research method:This paper uses Sony(SONY)high-speed camera and Delsys EMG Work 4.0 EMG test system to perform fixed-point and fixed-focus shooting on the overhanging flexion and extension of Zhan Xiangzhou,a gymnastics frontline athlete in Shaanxi Province,using Visua13D video analysis system and the Soviet Union.The Zaziolski movement mannequin synthesizes and analyzes more than 4,300 motion pictures.The smoothing process is performed by low-pass filtering and the relevant biomechanical indicator data is obtained.Research results:(1)Right angle overhanging stage:the athlete completes the horizontal bar suspension period,the angle of each joint is higher than the joint angle of each joint of the completed parallel bars project;in the angular velocity comparison,the athletes complete the joints in the right angle suspension period of the parallel bars project The angular velocities are greater than the angular velocities of the joints that complete the vertical angle suspension of the horizontal bar.It shows that the greater the angle of the athlete's joints,the greater the angular velocity.When the center of gravity of the athlete moves back to the pole,the shoulder joint angle is 117°-125°,and the joint angle and angular velocity of the hip joint angle are 155°-165°,which is more favorable.The completion of the action.In the analysis of myoelectricity,the athlete completed the main muscles of the deltoid toe,biceps,rectus abdominis and triceps at this stage,and the integral electromyogram of these main muscles was greater than that on the horizontal bar project.At this stage,the athletes complete the integral muscle value of the muscle group when completing the parallel bars project.The remaining muscle groups of the auxiliary muscle groups in the horizontal bar and parallel bars are equivalent in size,and there is no significant difference.(2)The front swing stage:the athletes are not fully deployed when the athletes are in the wave stage before the completion of the horizontal bar project.In the comparison of the horizontal bar and the parallel bars,the shoulder joint angle is close to the flat angle,so there is no significant difference,so the athlete is at the shoulder joint angle.In the range of 170°-180°,the hip joint angle of the horizontal bar project is 17°±5°,and the hip joint angle of the parallel bars project is 185°±5°.It is the best time for abdomen lifting legs.At this time,the abdomen lifting leg can be the next stage.The action is paved.In terms of electromyography,when the athlete completes this stage of action,the rectus abdominis,the rectus femoris,the pectoralis major,and the triceps are the main muscles,the anterior deltoid,the diaphragm,the biceps,and the back.The latissimus dorsi is equal in strength,and no significant difference mainly plays a supporting role.(3)Abdomen lifting leg stage:When the athlete completes the horizontal bar and parallel bar project at this stage,except for the hip joint,the angles of the joints in the completed parallel bar project are larger than the joint angle of each joint in the athlete's completion of the horizontal bar project,and the same joint The angles are not much different.Therefore,the athlete's shoulder joint angle is 170°-180°,hip joint angle is 175°-185°,is the best time for athletes to raise their legs and turn their hips.In terms of myoelectric analysis,the athletes had the largest integral electromyogram values of the rectus abdominis and the rectus femoris muscles during the abdomen and lifted legs,mainly concentrated in the lower limb joints as the main muscle group.(4)The hip compression bar is in the supporting phase:at this stage,the hip joint angle of the horizontal bar is 80°±5°,the hip joint angle of the parallel bar project is 90°±5°,and the angular velocity is(1.5±0.3)rad/s.The best leg wear angle is 43°-46°,followed by the shoulder,the pressure bar and the brake leg to accelerate the rotation of the upper body to form a support posture on the bar.In the analysis of myoelectricity,the diaphragm,biceps,pectoralis major and rectus abdominis are the main muscles,and the integral electromyogram of the main muscles is greater than that when the athlete completes the action on the horizontal bar project.The electromyogram value of the main muscle group during the parallel bar project.