Biomechanical Analysis Of Ankle Joint Force In Compound Exercise

Research background and purpose: Ankle joint, which is the body’s largest weight-bearing joint, supports the whole body’s weight when people are standing and bears five times of the whole body’s weight when people are walking. In daily life, activities such as walking and jumping mainly rely on the dorsal stretching and plantar flex ion. It is the fact that the medial malleolus of the ankle is shorter than its external ankle, the lateral ligament is weaker than medial deltoid ligament. Therefore, it is prone to generate injuries, or even damage lateral collateral ligament of ankle joint. Activity and stability which are related to the surrounding muscles of ankle joint are playing a decisive role in the performance of athletes. Now, high-level exercise training is combined with the guidance of high-tech biological scientific instrument to analyze the movement of athletes to raise the performance of athletes. It is alsoof significance to analyze the feature of ankle joint sin that it can avoid damage and improve athletes’ performance. However, the research on ankles which are in compound performance is relatively rare. This paper will provide scientific basis for sports training and sports physiology through the study of various parameters from 20 sports training students’ compound performance.Methods: the experiment selected 20 students,10 men and 10 women respectively, from the school sports training department of Tianjing University of sports. By adopting vicon motion optical capture system and Kistler three-dimensional strain 9281B(Kistler Inc.Schweiz) acquisition subjects respectively in two different patterns of compound(Mode one: running, emergency stop jump on one foot and both feet to the ground; Mode two: running, emergency stop feet, taking off the vertical landing and side run.) action of kinematic data and dynamic data index, and then do a data analysisin order to further observe the stress of the composite movement of the ankle.( Angle, force, torque) Finally,using the vicon system for export data analysis.Research results:(1) Characteristics of the angle of ankle joints from male and female athletes in different stages of movement ①In the sagittal plane of the first mode, when the take-off leg takes off the ground, the male group and the femalegroup appear differences, ②In the sagittal plane of the second mode, when the take-off leg takes off the ground, the male group and the female group appear differences, the boys and girls groups are different when the swing leg is extended away from the ground moment.(2) The test results and characteristics of the peak torque and the time of the male and female athletes in different movements. ①The first wave moment of the leg ankle joint of the leg ankle in the mode of the movement of the fashion face show significant differences between the male group and the female group. Male and female groups have differences in the second peak torque. The differences between male and female of the swing leg second wave crest torque are different. ②In the model of the first movement, male group and the female group appear differences in the first peak torque of the take-off leg ankle. ③In the model of the second movement, the differences between male group and the female group appearin the first wave moment of the take-off leg. ④In the first and second peak torque of time, the time differences of two modes of action at different levels: groups of males and females appear different degrees of difference sin the second peak torque time.(3). The test results and characteristics of the peak force and the time of the male and female athletes in different motions. ①In the model of the first movement, the boys and girls group appear differences in the first leg of the peak force, and the male and female group have differences in the second peak torque. The differences between male and female of the swing leg second wave crest torque are different. ②In the model of the second movement, the differences between male group and the female group appear in the first wave moment of the take-off leg. Male and female group have differences in the second peak torque. The differences between male and female of the swing leg second wave crest torque are different. ③In the first and second peak torque of time, the time differences of two modes of action at different levels: group of males and females are generated in the second peak torque time appear different degrees of differences.Research conclusions: 1.The kinematic characteristics of the ankle joints of the boys and girls in different forms of the compound movement are different(1)Action mode one: at the landing moment, the boy’s swinging leg is in the form of back flexion, and the girl’s swinging leg is in the form of plantar flexion. In the biggest moment of take-off, the boy and the girl swing leg are back flexion, and the degree of the plantar flexion of the male student is bigger than that of female students. In the moment of take-off and stretching, the boys’ and the girls’ take-off leg are both in the plantar flexion state, and the degree of the plantar flexion of the female student is bigger than that of male students.(2)Action mode two: In the moment of take-off and stretching, the take-off leg and the swinging leg of the male and the female are both in the form of plantar flexion, and the degree of the plantar flexion of the female student is bigger than the male’s. 2. The dynamic characteristics of the ankle joint of the boys and girls in different forms of the compound movement are different.(1)Action mode one: ①In the first wave moment of the sagittal plane and the second wave peak torque, the boys’ are higher than the girls’. In the first wave moment of the frontal plane, the boys’ are higher than the girls’. ②In the first wave moment of the sagittal plane and the second wave peak torque, the boys’ are higher than the girls’.(2)Action mode two: ①In the first wave peak torque moment of the sagittal plane, the degree of boys’ take-off leg are bigger than the girls’. ②In the first wave peak force value moment of the sagittal plane, the degree of boys’ take-off leg are bigger than the girls’.(3)In different forms of the compound movement, the girls’ appearance time of the second wave peak torque and the peak force values are earlier than the boys’.