| Objective: To investigate the effect of the step and jump jump stop on the biomechanical characteristics of knee joint.Explore the risk of knee injuries and the prevention measures are put forward.To provide a theoretical basis for teaching and for the majority of the basketball coach improvement action.For basketball fans and subsequent researchers to provide some basis and reference.Methods: subjects were 8 at the age of 20-25 of the Beijing Sport University undergraduate basketball enthusiasts.Using Motion Systems infrared high-speed motion capture test system(200Hz),Kistler force platform(1000Hz)synchronous acquisition of kinematic and kinetic data,using single factor analysis of variance of repeated measurement and comparison of the two different actions of jumper basketball fans biomechanical characteristics of knee joint and the difference with the independent sample T test to compare the difference between the same jumper two knee joints.Results: stride jump stop buffer in the body center of gravity height maximum instantaneous low(p<0.05).Jump jump stop vertical ground reaction force and peak value(p<0.05).The vertical ground reaction force peak moment,stride jump stop front knee angle contrast or foot jump stop feet knee angle is small(p<0.05)the forefoot,external rotation angle is larger(p<0.05),the direction of the sagittal axis force(p<0.05),the front knee extension and external rotation torque is large(p<0.05).This moment,jump stop vertical jump knees with great stress(p<0.05).Conclusions: 1 kinematic characteristics as the center of gravity step jump stop below the jump jump stop.The vertical ground reaction force peak moment of stride jump stop front knee angle compared to the rear or jump jump stop feet is smaller,and the external rotation angle at the front of the larger.2.dynamic characteristics for the jump step jump stop vertical ground reaction force greater than peak stride jump stop.The vertical decent reaction force peak moment,stride jump stop by the front foot on sagittal axis direction of the force is greater than the same movement of the rear foot,contrast jump jump stop is also so.But the vertical jump knees step jump stop by force To be significantly greater than the stride jump stop.Stride jump stop in the vertical ground reaction force peak moment of forefoot knee extensor and external rotation torque is greater than the jump jump stop.3.stride jump stop front buffer maximum instantaneous because the knee joint angle is too small and a large rotation angle,the the risk of the collateral ligament or meniscus injury.The increase of stride jump stop the front knee extensor greatly increases the risk of anterior cruciate ligament injury.The peak jump jump stop knees by the vertical force is greater than the step jump stop,the risk of injury can increase the patellar tendon and anterior cruciate ligament.Stride jump stop in the vertical The front knee,knee joint,extensor knee and external rotation moment of the peak moment of the reaction force are greater than those of the jump jump,and there is a greater risk of injury due to pedaling,stretching and twisting... |
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