A comparative study of biomechanics of lower limbs of overweight and normal people during drop jump landing
Objective To explore the biomechanical differences of the lower limbs between overweight people and normal people during drop jump landing.Methods The Vicon 3D motion capture system and Kistler 3D force gauge were used to collect the biomechanic data of the lower limbs of 12 normal and overweight male college students during drop jump landing simultaneously,and the Visual 3D soft-ware was employed to calculate kinematic and dynamic values.Then the two groups were compared the joint mobility,torque and stiffness,and the contribution of joint stiffness to the lower limbs'stiff-ness among the overweight people was analyzed by using the linear regression.Results In terms of ki-nematics,the angles of the ankle,knee and hip joints at the end of centrifugation and their ranges of motion among the overweight people were significantly smaller than the normal ones(P<0.05).In terms of dynamics,the occurrence time of the maximum pedaling torque and power of hip and knee joints delayed compared with the latter(P<0.05),while the maximum pedaling torque of the knee was significantly greater than the latter(P<0.05),with the maximum pedaling power of the knee and ankle significantly lower(P<0.05).Moreover,the stiffness of the lower limb,knee and ankle of the over-weight group was significantly greater than the normal group(P<0.05),with significant contribution of the knee stiffness to the overall stiffness of the lower limb among the overweight people(P<0.05).Con-clusion Compared with the normal group,the overweight group is of insufficient joint range of motion and excessive knee torque,resulting in excessive stiffness in lower limbs.Thus,they suffer from high-er risk of injury.Therefore,they should try to increase their range of motion of jointsand protect knees to avoid sports injuries.
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