A Comparative Study Of The Different Levels Of Sanda Round Kick Technical Action Features Outstanding Athletes

Objective: To explore the connection between excellent male Sanda player's difference in the weight level and the technical characteristics of round horse kick,and to improve the maximum effect of the application of round horse kick in different weight classes.Methods: Using the VICON Nexus 3D motion capture system,collect data from the trajectory of the technical movements of the round horse kick of 15 athletes,from the 60 kg,75kg,and 90 kg in the men's individual projects of the 13 th national games.According to the characteristics of the whipping action and the principle of the kinematic chain movement,the technical movement of the round horse kick is divided into 3 periods and 4 moments,and the movement trajectory of the technical movement of the round horse kick in 3 periods,4moments of movement,time,speed and Lower limb joint angles,angular velocities,and moments were analyzed using Polygon 3.5 software.Results: During the start-up period(P1),the rotation of the trunk and supporting legs of the 60 kg athlete showed a phenomenon of “up is bigger and down is smaller ”,and 90 kg athletes showed a phenomenon of “up is smaller and down is bigger ”.There was a significant difference in the amplitude and direction of joint movement between the trunk and lower limbs of athletes(p<0.05).In the striking period(P2),90 kg athletes exhibited excessive flexion and extension steering movements in the hips and knee joints,and the angular velocity and moment of the knee joints in the offensive legs were relative.Smaller,relatively slow action speed;recovery phase(P3)athletes round horse kick technology,the overall performance of the speed of 60kg> 75kg> 90 kg,action movement and action time comprehensive performance of 90kg> 75kg> 60kg;There was a significant difference between the amplitude and direction of motion and the movement speed,time and displacement of the athletes' trunk and lower limbs(p<0.05).Conclusion: There are significant differences in the speed of action,time of action,striking distance,and the angle,angular velocity,and moment of the lower extremity joints among outstanding Sanda athletes due to their different weight levels.The torso and supporting leg of small-scale athletes have a relatively large amplitude of rotation around the axis during the start-up period,and the movement characteristics of the sports chain arerelatively obvious.The technical movement speed of each stage is relatively fast and the technical movement characteristics are relatively reasonable.The torso and supporting legs of large-scale athletes rotate relatively little around the axis during the start-up period,which has a great influence on the technical movement characteristics of the striking period and the recovery period.Although the striking distance is relatively long,the buckling steering movements that the support leg repeatedly appears in order to adjust the balance at the moment of impact have an adverse effect on the speed of the technical movement,and the rationality of its technical movement characteristics remains to be further discussed.