| Objective: to collect the kinematic data of six first-class badminton players in the left rear field,and divide the movements into three stages according to the essentials of technical movements and technical assessment standards.they are the starting stage,the mobile batting stage and the reversing stage.According to this,we can understand the basic kinematic characteristics and rules of the lower limb joints of the badminton players,analyze the kinematic structure of the joints of 6 athletes,and find out the similarities and differences,so as to further optimize the sports techniques.Methods: the kinematic parameters of lower limbs of six first-class badminton players were collected by using the high-precision optical inertia hybrid motion capture system Perception Neuron Studio produced by Beijing Nuoyiteng Company.The experiment was conducted in the Badminton Gymnasium of Tianjin Institute of physical Education.Use the python parsing web page version of the system to analyze the original exported bvh data,draw curves with excel2019,and describe and analyze them combined with anatomy,basic mechanical principles and other disciplines.Results: the start-up stage: the characteristics of movement time: the average time of complete movements of 6 athletes was 2.76 s,the longest time was 2.83 s for A3 athletes,and the shortest time was 2.59 s for A2 athletes.In the start-up stage,the shortest time for A2 athletes is 0.67 s,and the longest is 0.8s for A3 athletes.In the mobile batting stage,the time used by A4 players was the longest,while that by 0.81 s graded A5 players was the shortest(0.77s).In the return phase,the average time spent by athletes was the longest in 1.29 s for A5 athletes and the shortest for 1.30 s for A2 athletes,with1.12 s.The main characteristics of the range of motion of the joint: the maximum left hip flexion angle of A2 athletes was 77.24 °,the minimum was A4 athletes 48.79 °,and the left hip extension angle was 1.23 °.The maximum internal rotation angle of the left hip joint of A6 athletes was 9.60 °.The maximum external rotation angle of left hip joint of A1 athletes was 4.67 °,and the maximum adduction angle of left hip joint of A4 and A5 athletes was 2.82 °and 1.46 °.The maximum extension angle of left knee joint of A1 athletes was 23.17 °,and that of A2 athletes was 37.82 °.The maximum flexion angle of left ankle of A2 athletes was 16.22 °,and the maximum angle of right ankle extension of A4 athletes was 43.44 °.The maximum varus angle of right ankle of A6 athletes was 6.18 °.There were significant differences in range of motion among 6athletes.Mobile hitting stage: the main characteristics of the range of motion of the joint: the maximum flexion angle of A2 athletes was 100.96 °,and that of A4 athletes was 61.23 °.The maximum external rotation angle of left hip of A4,A5 and A6 athletes was about23 °higher than that of A1,A2 and A3 athletes.The maximum adduction angle of right hip of A2 athletes was about 13 °higher than that of other athletes.The maximum flexion angle of knee joint of A1,A2 and A3 athletes is about 40 °higher than that of A4,A5 and A6 athletes.The flexion angle of hip joint of A1,A2 and A3 athletes is about 20 °higher than that of A4,A5 and A6 athletes,and the left knee extension angle of A3 and A4 athletes is 1.39 °and 1.03 °higher than that of other athletes.Return stage: the main characteristics of the range of motion of the joint: the maximum extension angle of the left hip of A2 athletes is 8.56 °,which is about 13 °lower than that of other athletes.The maximum internal rotation angle of the left knee of A1A2A3 was 7.4 °,4.04 °and 4.55 °respectively,which was 13 °lower than that of other athletes.The maximum flexion angle of left ankle of A1 and A3 athletes was 9.72 °and8.51 °respectively.The lateral rotation of right ankle was 4.65 °in A1 athletes and48.45 °in A5 athletes.Conclusion: in the start-up stage,all the 6 athletes adopted the start-up pedal to turn to the side landing buffer time,and the action process was kept fast during start-up,and the start-up process was completed in an average time of 0.73 s,and the start-up process was controlled by adjusting their own joint angles.all showed a good order of action.Mobile hitting stage: the hip joints of 6 athletes did the process of accelerated torsion and braking,the main joints of the lower limbs coordinated movement,and the order of force conduction was hip joint-knee joint-ankle joint.From the beginning of pedal and stretch take-off,different athletes show different angles of lower limb flexion,and often a larger flexion angle helps to promote the height of upward pedal and extension.Return stage: for the connecting action of the mobile hitting stage,the return footwork is light and smooth,the center of gravity is stable,and is ready for the start of the next racket.It presents periodic and alternating movement.from the point of view of the overturning of the landing moment of the ankle joint in the reversing phase,strengthening the coordination between the calf and foot will help to alleviate the impact of the knee joint and ankle joint at the moment of landing. |
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