搂膝拗步膝踝关节预激活与共收缩的表面肌电分析
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1.山东体育学院 研究生教育学院;2.山东体育学院;3.山东省体育科学研究中心

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Surface EMG Analysis of Pre-activation and Co-contraction of Knee and Ankle Joint in Brush-knee Twist-step
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    摘要:

    摘要:目的:分析长期太极拳练习者进行搂膝拗步和正常行走时下肢膝踝关节肌群预激活与共收缩的表面肌电学特征,探讨太极预防跌倒的神经肌肉控制策略。方法:采用Vicon运动捕捉系统、Kistler测力板和Noraxon表面肌电图系统同步采集搂膝拗步和正常行走时股直肌、股二头肌、胫骨前肌、外侧腓肠肌的表面肌电信号和体位信息。通过股直肌和股二头肌、胫骨前肌和外侧腓肠肌两对肌肉的积分肌电分别计算膝踝关节预激活和共收缩。结果:与正常行走相比,搂膝拗步在四个阶段的平均用时显著增加;搂膝拗步在四个阶段内时间百分比存在显著性差异;搂膝拗步膝关节共收缩水平和预激活水平降低,踝关节共收缩水平和预激活水平升高。结论:长期的太极拳练习可能使膝关节周围肌肉的激活水平提高,增强了肌肉群之间的协同作用,以帮助稳定关节;对于踝关节我们推测老年人可能需要更大的脚踝稳定性和刚度。这些发现强调了神经肌肉控制策略在决定性能和支持肌肉骨骼系统以优化功能和调节损伤风险方面的影响,为神经肌肉控制障碍疾病的康复评估和训练提供参考。

    Abstract:

    Abstract: Objective: This study aimed to analyze the muscle co-contraction and pre-activation during brush-knee twist-step and normal walk among long-term Tai Chi practitioners to explore the neuromuscular control strategies of Tai Chi. Methods: Vicon motion capture system, Kistler force plate, and Noraxon surface electromyography system were synchronously used to collect the electromyography (EMG) sign of the rectus femoris, biceps femoris, tibialis anterior muscle, lateral head of gastrocnemius and body posture information while performing the brush-knee twist-step and normal walk. The pre-activation and co-contraction of the knee and ankle joints were calculated by integrated EMG of the rectus femoris and biceps femoris, tibial anterior and lateral gastrocnemius muscles. Results: Compared with normal walk, the average time of the four phases of the brush-knee twist-step was significantly increased; there was a significant difference in the percentage of time in the four phases; the knee joint co-contraction level and pre-activation level decreased, and the ankle joint co-contraction level and pre-activation level increased. Conclusion: Long-term Tai Chi exercises may increase the activation level of the muscles around the knee joint and enhance the synergy between the muscle groups to help stabilize the joint;For the ankle joint, we speculate that the elderly may need greater ankle stability and stiffness. These findings emphasize the influence of neuromuscular control strategies in determining performance and supporting the musculoskeletal system to optimize function and regulate injury risk, and provide references for rehabilitation assessment and training of neuromuscular control disorders.

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  • 收稿日期:2021-06-12
  • 最后修改日期:2021-09-03
  • 录用日期:2021-09-07
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