Objective To determine the effect of fatigue on the risk of anterior cruciate ligament (ACL) injuries using a controlled experiment.Method Thirty-two young male adults were selected.Half of them were asked to complete landing and sudden cutting tasks when feeling fatigue,while the rest were asked to conduct the same tasks without fatigue.Results The results indicated that fatigue led to increased knee flexion and knee rotation of the support leg during the initial landing,It also resulted in significant increase in the peak knee flexion,knee internal rotation angle and knee internal rotation moment during the double support phase.Moreover,the peak value of the knee flexion angle and knee internal rotation angle increased significantly due to fatigue during the single leg support period.Conclusion Being fatigue,people might take the adaptive posture control to decrease the ground shock,which in turn decreases ACL injury risks.However,it can be neutralized by the increase in the rotational angle.%目的:通过受控实验的方法,揭示疲劳对前交叉韧带损伤风险因素的影响机理.方法:32名男性受试者参与本次实验.其中,16名受试者在疲劳条件下完成跳下及突然变向实验任务,另外16名受试者在非疲劳条件下完成相同的实验任务.实验考察的因变量包括在落地初始、双腿支撑和单腿支撑等关键时间点上的下肢关节运动学指标和动力学指标.结果:在疲劳条件下,受试者在落地初始阶段的支撑腿膝屈曲角和膝旋内力矩均比非疲劳条件下明显增大;而在双腿支撑阶段,膝屈曲角峰值、膝内旋角峰值和膝旋内力矩峰值均比非疲劳条件下明显增大;最后在单腿支撑阶段,膝屈曲角峰值和膝屈曲力矩峰值均比非疲劳条件下明显增大.结论:在疲劳条件下,受试者执行跳下实验任务时,通过增加落地时的支撑腿膝屈曲角来减小地面冲击,降低前交叉韧带损伤的风险;但是支撑腿膝旋转角的增大会抵消这一效果.
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