| Objective: The influence of badminton shoes with different midsole hardness on the biomechanical characteristics of typical footwork lower limbs was discussed,so as to evaluate the performance of badminton shoes with different midsole hardness,which provided a theoretical basis for the design and development of badminton midsole hardness and the prevention of lower limb sports injuries.Methods: Sixteen high-level badminton players were selected as the study subjects and wore badminton shoes with midsole hardness of 50C(soft shoes),55C(medium soft shoes)and 60C(hard shoes)for pedaling and jumping and killing movements.Using the Sweden Qualisys infrared Motion Capture System,Kistler 3D Force Meter and Delsys Wireless Surface EMG were used to simultaneously test the kinematic,dynamic and surface EMG signals generated by athletes wearing three pairs of badminton shoes with different midsole hardness.The single-way repeated measure ANOVA method was used to statistically analyze all the data,and the significance level was P<0.05.Results:(1)Kinematics and dynamic indexes of pedaling stride: In the forehand stride cushioning stage,athletes wearing soft shoes with a midsole hardness of 50 C have a significantly higher ankle joint mobility than a midsole hardness of 55C(P<0.05);In the stretching stage,the ground reaction force of a soft shoe with a midsole hardness of 55 C in the left and right directions is significantly higher than that of a hardness shoe with a midsole hardness of 60C(P<0.05).(2)Kinematics and dynamic indexes of jumping and killing action: three pairs of badminton shoes with different midsole hardness changed significantly in the angle of ankle valgus(P<0.05);wearing a soft shoe with a midsole hardness of 50 C,and the dorsiflexion angle speed of the ankle joint is significantly smaller than that of a hardness shoes with a midsole hardness of 60 C.(3)Muscle activation characteristics by different midsole stiffness: three pairs of badminton shoes with different midsole hardness had significant changes in RMS and i EMG of biceps femoris(P<0.05)during the forehand stride stage.In the backhand stride step stretching stage,there was a significant change between RMS of the rectus femoral muscle of a shoe with a midsole hardness of 50 C and a shoe with a hardness of 60C(P<0.05),and between RMS of a midsole hardness of 55 C and a shoe with a midsole hardness of 60C(P<0.05).Conclusion:(1)The midsole hardness can achieve a cushioning effect on the mid-soft shoes with a stride action of 55 C in the front court,which can effectively reduce the risk of sports injuries and is a more moderate choice.(2)With the increase of the hardness of the midsole,the angle of ankle valgus increases.Therefore,hardness midsole shoes are prone to injury risks when performing jumping;At the same time,the change of midsole hardness can improve the pedaling and extension efficiency of badminton footwork,which in turn has a certain impact on sports performance ability.(3)The increase of midsole stiffness increas the RMS and i EMG of the quadriceps muscle,and the muscle co-activation ratio of the knee joint increas significantly,revealing that the stability of the knee joint was improved,so as to prevent knee sports injuries. |
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