Tang Yuting, Li Yanfeng, Yang Maosha, Zheng Xiao, An Bingchen, Zheng Jiejiao
Department of Rehabilitation, Municipal Hospital of Traditional Chinese Medicine Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.
Department of Rehabilitation, The Second Rehabilitation Hospital, Shanghai, China.
Front Neurosci. 2022 Oct 4;16:1003023. doi: 10.3389/fnins.2022.1003023. eCollection 2022.
To investigate the effect of hip abductor fatigue on the kinematics and kinetics of the knee joint during walking in healthy people to provide a new approach for the prevention and treatment of knee-related injuries and diseases.
Twenty healthy participants, ten females, and ten males, with a mean age of 25.10 ± 1.2 years, were recruited. Isometric muscle strength testing equipment was used to measure the changes in muscle strength before and after fatigue, and the surface electromyography (SEMG) data during fatigue were recorded synchronously. The Vicon system and an AMTI© force platform were used to record the kinematic parameters and ground reaction force (GRF) of twenty participants walking at a self-selected speed before and after fatigue. Visual 3D software was used to calculate the angles and torques of the hip and knee joints.
After fatigue, the muscle strength, median frequency (MF) and mean frequency (MNF) of participants decreased significantly ( < 0.001). The sagittal plane range of motion (ROM) of the knee ( < 0.0001) and hip joint ( < 0.01) on the fatigue side was significantly smaller than before fatigue. After fatigue, the first and second peaks of the external knee adduction moment (EKAM) in participants were greater than before fatigue ( < 0.0001), and the peak values of the knee abduction moment were also higher than those before fatigue ( < 0.05). On the horizontal plane, there is also a larger peak of internal moment during walking after fatigue ( < 0.01).
Hip abductor fatigue affects knee kinematics and kinetics during normal gait. Therefore, evaluating hip abductor strength and providing intensive training for patients with muscle weakness may be an important part of preventing knee-related injuries.
研究健康人群行走时髋外展肌疲劳对膝关节运动学和动力学的影响，为膝关节相关损伤和疾病的防治提供新途径。
招募20名健康参与者，其中10名女性和10名男性，平均年龄25.10±1.2岁。使用等长肌力测试设备测量疲劳前后肌肉力量的变化，并同步记录疲劳过程中的表面肌电图（SEMG）数据。采用Vicon系统和AMTI©力平台记录20名参与者在疲劳前后以自选速度行走时的运动学参数和地面反作用力（GRF）。使用Visual 3D软件计算髋关节和膝关节的角度和扭矩。
疲劳后，参与者的肌肉力量、中位频率（MF）和平均频率（MNF）显著下降（<0.001）。疲劳侧膝关节（<0.0001）和髋关节（<0.01）矢状面活动范围（ROM）明显小于疲劳前。疲劳后，参与者膝关节内收力矩（EKAM）的第一和第二峰值大于疲劳前（<0.0001），膝关节外展力矩峰值也高于疲劳前（<0.05）。在水平面，疲劳后行走时内力矩也有较大峰值（<0.01）。
髋外展肌疲劳影响正常步态下的膝关节运动学和动力学。因此，评估髋外展肌力量并为肌肉无力患者提供强化训练可能是预防膝关节相关损伤的重要环节。
