A Study on the Characteristics of Isokinetic Muscle Strength and Dynamic Balance and Their Correlation in Elite Badminton Players'Lower Limb Three Joints
OBJECTIVE:Building upon prior research,this study meticulously analyzes isokinetic strength characteristics of the lower limb three joints and dynamic balance in elite badminton players.The study aims to investigate the correlation between isokinetic strength features and dynamic balance abilities in the lower limbs of badminton players,providing a theoretical foundation for their training and scientific talent selection.METHODS:Employing the Swiss-produced multi-joint isokinetic strength testing and training system along with the Med-Track plantar pressure distribution board,male badminton players from Inner Mongolia Normal University underwent isokinetic strength tests at angular velocities of 60°/s,180°/s,and 300°/s for the lower limb three joints,coupled with dynamic balance ability tests.Paired sample t-tests were utilized to analyze isokinetic strength features and balance indicators,and correlation tests were conducted between isokinetic strength test indicators and dynamic balance ability indicators.RESULTS:(1)No significant differences were observed in the peak torque and relative peak torque of the hip,knee,and ankle flexor-extensor muscle groups on both sides of the lower limb in male badminton players.Extensor peak torque and relative peak torque on both sides of the lower limb were greater than flexors(P<0.05).The peak torque ratio of flexors and extensors showed no significant difference on both sides,and both were greater than in other domestic elite athletes.(2)No significant differences were found in various indicators of dynamic balance between the dominant and non-dominant sides of badminton players,indicating balanced development of dynamic balance on both sides.The Pearson coefficients revealed significant negative correlations between the hip joint flexor-extensor torque ratio and the center of pressure envelope area,as well as the total trajectory length per unit area.The knee joint torque ratio showed significant negative correlations with the center of pressure envelope area and the total trajectory length.The ankle joint flexor peak torque,relative peak torque,and the total trajectory length per unit area demonstrated significant positive correlations,while the flexor-extensor torque ratio showed a significant positive correlation with the longitudinal center of pressure sway trajectory length.(3)The impact of the lower limb three joints on dynamic balance abilities in badminton players ranked as follows:ankle joint(0.629-0.810:P<0.05)>knee joint(0.639-0.727:P<0.05)>hip joint(0.624-0.651:P<0.05).Male badminton players from Inner Mongolia Normal University should focus on targeted strengthening exercises for the extensor strength of the lower limb three joints during regular training.Improving dynamic balance abilities can be achieved through specific strength training for the hip,knee,and ankle joints.Coaches can predict the dynamic balance abilities of players by considering the isokinetic strength characteristics,particularly the flexor-extensor torque ratio,on the dominant and non-dominant sides of the lower limb,aiding in the selection of outstanding athletes.
badmintonathletesmuscle strength characteristicsdynamic balancelower limb three jointscorrelation