首页|连续疲劳干预对膝关节主被动生物力学特性的影响

连续疲劳干预对膝关节主被动生物力学特性的影响

Effects of Sustained Fatigue on Passive and Active Biomechanical Characteristics of the Knee

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目的 探究连续疲劳干预对膝关节主被动生物力学特性的影响.方法 招募27位健康大学生在等速力量测试系统上进行疲劳实验.疲劳实验包括3个疲劳周期,每个疲劳周期至少30次股四头肌连续等长收缩.对比不同疲劳周期的最大被动力矩、平均最大自主收缩(maximum voluntary contraction,MVC)力矩、股外侧肌和股二头肌肌电积分值以及协同收缩指数(co-contraction index,CI).结果 疲劳周期3后,最大被动力矩显著下降(P＜0.05).疲劳周期1、2、3过程内平均MVC力矩、股外侧肌和股二头肌肌电积分值都显著下降(P＜0.05),然而二者CI全程无显著变化(P＞0.05).结论 股四头肌等长收缩训练剂量为90次的连续疲劳干预会显著影响膝关节主被动生物力学特性.疲劳干预后,膝关节抵抗被动屈伸能力下降.并且随着疲劳干预进程,股四头肌主动收缩能力下降,股四头肌和腘绳肌肌肉激活也下降,但二者肌群协同收缩水平不变.这种温和的肌群协同收缩模式有益于保持良性膝关节力学加载环境.研究结果有助于理解疲劳后膝关节主被动生物力学特性.
Objective To investigate the effect of sustained fatigue on the passive and active biomechanical characteristics of the knee.Methods Twenty-seven healthy university students were recruited to perform a fatigue experiment using an isokinetic dynamometer.The fatigue experiment included three fatigue cycles with more than 30 sustained quadriceps submaximal voluntary isometric contractions per cycle.The maximum passive torque,mean maximum voluntary contraction(MVC)torque,integrated electromyography of the vastus lateralis and biceps femoris,and co-contraction index(CI)during different fatigue cycles were compared.Results The maximum passive torque decreased significantly only after the 3rd fatigue cycle(P＜0.05).The mean MVC torque and integrated electromyography of the vastus lateralis and biceps femoris decreased significantly during the 1st,2nd,and 3rd fatigue cycles(P＜0.05).However,the Cl did not change significantly(P＞0.05).Conclusions Sustained fatigue intervention with 90-fold isometric contraction training of the quadriceps significantly affected the active and passive biomechanical properties of the knee.After fatigue intervention,the resistance of the knee joint to passive flexion and extension decreased.With fatigue intervention,the active contraction ability of the quadriceps decreased,and the activation of the quadriceps femoris and hamstring muscles also decreased;however,the co-contraction level of the two muscle groups remained unchanged.This mild muscle group co-contraction pattern is beneficial for maintaining a benign mechanical loading environment in the knee joints.These results help us understand the active and passive biomechanical properties of knee joints after fatigue.

sustained fatigueknee jointco-contractionisometric contractionbiomechanical characteristics

孔祥飞、王洪丹、连子瞻、姚杰、樊瑜波

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北京航空航天大学生物与医学工程学院,北京 100083

吉林体育学院,长春 130022

连续疲劳 膝关节 协同收缩 等长收缩 生物力学特性

国家自然科学基金项目国家自然科学基金项目载人航天工程航天医学实验领域资助项目国家重点研发计划课题中央高校基本科研业务费专项资金中国科协青年人才托举工程

12272033U20A20390HYZHXM010032023YFC3603901YWF-23-YG-QB-008YESS 2015QNRC001

2024

10.16156/j.1004-7220.2024.03.012

医用生物力学
上海第二医科大学

医用生物力学

CSTPCD北大核心
影响因子：0.858
ISSN：1004-7220
年,卷(期)：2024.39(3)