The Biomechanical Analysis Of FREE DOUBLE ILLUSION TO VERTICAL SPLIT Difficulty In Aerobic Gymnastics

In aerobics gymnastics competitions,completing high-quality difficult moves with high quality is an important guarantee to enhance the competitiveness of complete sets of movements.Excellent athletes at home and abroad often choose Free Double Illusion to Vertical Split Difficulty moves to increase the set of competition However,during the competition and daily training,it is found that many athletes often have irregular movements or even mistakes.Therefore,the key links and correct methods of the Free Double Illusion to Vertical Split Difficulty are excavated to improve the quality of the action.Become an urgent problem.This paper takes the biomechanical analysis of Free Double Illusion to Vertical Split Difficulty as the research object,and uses the literature data method,interview method,experimental method,mathematical statistics method,and comparative analysis method,mainly using Motion high speed capture system of infrared light spot.The system and Kistler three-dimensional force platform simultaneously collected the kinematics and dynamics data of the six athletes when they completed the difficulty element,and conducted an in-depth analysis to explore the technical characteristics of each stage of the difficulty,while comparing the male and female athletes when they completed the difficulty element.Similarities and differences provide a reference for the teaching and training of difficulty elements.The conclusions of the study are as follows:1.When the athlete completes the movement,the center of gravity is displaced the most in the vertical direction.Both the leg swing and vertical split phases reach the lowest point when the angle between the two legs reaches the maximum,within the range of 60-70 cm and 70-90 cm,respectively.The position is relatively high;the change of the center of gravity in the horizontal direction is small,and the average displacement is 54.37 mm backwards during the vertical swing upward swing phase,which ensures that the hip swing leg is fully seated while reducing the resistance that the upper body overcomes when standing.2.On the eve of swinging the leg off the ground during the last step,the range of motion of the left knee joint of the athlete is between 0 °-25 °.Proper constrictive contraction of the left knee joint can increase the initial power of the previous illusion phase.3.The left and right hip joint angles at the maximum angle between the two legs at the front and back of illusion stage were 171.10 ° and 164.93 ° respectively;the average values of the right hip joint angles were 8.51 ° and 3.07 ° respectively;the smaller right hip angle and the fully extended left hip The angle helps the athlete to complete the turning movement in the sagittal plane.The forward and backward swinging legs and the torso are kept in a lever state during the forward and backward stages.The left arm accelerates to swing when the trunk is bent down,and the right arm accelerates to swing when the trunk is raised.Increased balance stability of the swivel.4.During the vertical splitting phase,the torso and swinging legs simultaneously accelerate and then decelerate during the swinging up and falling of the swinging legs,and the head and toe speeds decrease to 0.57m/s and 2.3m/s respectively at the maximum angle.The relatively low value of s lays the foundation for the swinging leg to change its original direction.5.The change of the ground reaction force on the Z axis is the most obvious.The upper swing of the swing leg and the rapid rise of the torso increase the reaction force of the ground to the human body and provide the power of the rotation;the change rule of the horizontal total force is basically maintained with the Z axis Consistently,the direction of the force of the supporting legs and the angle of the rotation are counter-clockwise when Elysin rotates,so that the athlete always maintains a dynamic balance when completing the difficulty.6.Excellent male and female athletes have no significant differences in parameters such as exercise time and peak force when completing difficult movements;the third test of the maximum difference between the angles of two legs P = 0.01 Male students;the flexion and extension angles of the left hip when the second upper body is parallel to the ground,the right hip when the first angle between the two legs is at the minimum,and the left hip when the third upper body is parallel to the ground The test P value is less than 0.05,the core control ability of male athletes is stronger than that of females during the leg swing,which ensures the stability of the body lever structure.