Kinematics Analysis Of The Difficulty Combination C386 Connected To C288 In Competitive Aerobics

With the continuous development of competitive calisthenics,the competition is increasingly fierce,and the combination of difficulty has become an indispensable part of the complete sets of movements of high-level athletes.In this paper,the kinematics principle is applied to study the movement technology of difficulty combination C386 to C288,and the structure of the movement of difficulty combination C386 to C288 is analyzed,as well as the correlation and technical characteristics of each stage,so as to build the movement technology model of difficulty combination C386 to C288.At the same time through the fall stage and the second phase suspension centre of gravity is the supreme moment highly correlation analysis,find out the connection difficulty C386 before and after the difficulty C288 core elements,strengthen the coaches and athletes in the teaching and practice and normative,for the development of competitive aerobics difficult movements especially difficult combination to provide theory basis.This paper ten of the sampling frequency of 200 hz Qualisys motion capture infrared camera on an international level athletes athletesathletesathletes finish the difficulty and seven countries take C386 to C288 kinematic data collection,through the Visual3D software build human body model,in view of the difficult combination C386 meet C288 movement kinematics parameters,such as time,displacement of center of gravity and joint Angle is analyzed.Then,SPSS23.0 was used to conduct Pearson correlation analysis or spear-man correlation analysis on the relevant parameters in the falling stage and the height of the center of gravity at the highest moment in the second emptying stage(Pearson correlation analysis was used for data conforming to normal distribution,and spear-man correlation analysis was used for data not conforming to normal distribution).Finally,Origin2017 drawing software was applied to make graphics.The research conclusions of this paper are as follows:(1)8 athletes completed the difficulty combination C386 to C288 each stage of the movement time model is:1.55s in the upper stage,0.43s in the take-off stage,0.64s in the take-off stage,0.24s in the landing stage,0.65s in the second take-off stage,and 0.33s in the landing platform.(2)8 athletes completed the difficulty combination C386 to C288 center of gravity displacement model is:the displacement of the body's center of gravity in the X-axis is about 0-1.6m.The Y-axis displacement of the center of gravity of the body is approximately 0.35m in the right direction and 0.55m in the left direction.The z-axis displacement of the body's center of gravity is about 0.2-1.6m.(3)8 athletes completed the difficulty combination of C386 to C288 in each stage of the difficulty combination technical model is:in the upper stage,the average step length of athletes is 0.78m,accounting for about 44.2%of their height.The average Angle of the hip joint at the lowest center of gravity of the takeoff stage is about 110°,the average Angle of the knee joint is about 105°,and the average Angle of the shoulder and hip torsion in the takeoff stage is about 15°-35°.The Angle of the Angle between the legs at the moment of longitudinal split in the flight stage was 175°,and the average time difference between the moment of longitudinal split in flight stage and the moment of the highest center of gravity in flight stage was 0.018s.The average Angle of the hip joint at the lowest center of gravity in the falling stage was about 133°,the average Angle of the knee joint was about 130°,and the average Angle of shoulder and hip torsion in the falling stage is about 5°-25°.The average Angle of the flexion body in the attitude of the flexion body in the second tenting stage is about 55°,the movement time of the flexion body in the rising stage and the spreading stage in the descending stage is about 1:1.5,and the average time difference between the posture of the flexion body in the second tenting stage and the highest moment of the center of gravity in the second tenting stage is 0.018s.The Angle of frontal plane of shoulder joint is about 60°,the Angle of elbow joint is 65°,and the Angle of hip joint and knee joint is about 165°.(4)The rationality of the connection technology in the landing stage is the premise to ensure the accurate and stable performance of the post-difficult movement.Increasing the velocity of the center of gravity at off-ground is the key to improve the height of the difficulty after c-c combination,while strengthening the active force of the right joint is the key to improve the velocity of the center of gravity at off-ground.(5)The 8 athletes completed the difficulty combination.The lower the Angle of the right knee and right ankle at the time of landing and the lowest moment of center of gravity,the higher the height of the highest moment of center of gravity at the second time.In addition,the smaller the torsional Angle of the shoulder and hip at the time of landing and the lowest moment of the center of gravity at the landing stage,the more beneficial it is to the height of lifting C288.