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本文以主动肌和拮抗肌的协同作用机理为依据,从表面肌电(EMG)信号的频率参数和肌肉平均传导速度两个方面,对近年来提出的正常人体神经肌肉系统控制的新理论——“共驱动”概念,在关节水平上进行了探讨和研究,实验结果表明:膝关节的主动肌和拮抗肌在持续恒力收缩下,其表面EMG信号功率谱的归一化中值频率随着时间的增加而同时下降;两路EMG信号的归一化中值频率之间的互相关系数随着收缩力的减小而减小,肘关节的肱二头肌不论是作为主动肌还是拮抗肌,在持续恒力收缩下,由表面EMG信号估计得到的肌肉的平均传导速度均随着收缩时间的增加而下降;肱二头肌作为拮抗肌时,平均传导速度明显高于其作为主动肌时的平均传导速度。
In this paper, based on the synergistic mechanism of active muscle and antagonistic muscle, this paper gives a new theory of normal human neuromuscular system control proposed in recent years from two aspects of the frequency parameters of EMG signal and the average muscle conduction velocity - The concept of “common drive” is discussed and studied at the joint level. The experimental results show that the normalized median frequency of the EMG signal power spectrum of the active and antagonistic muscles of the knee under continuous constant force contraction follows the Time while decreasing; the cross-correlation coefficient between the normalized median frequencies of the two EMG signals decreases with the decrease of contractility, and the biceps of the elbow joint, whether as active or antagonist , The mean conduction velocity of muscle estimated from the surface EMG signal decreased with the increase of contraction time under constant constant contraction. The average conduction velocity of biceps muscle as antagonist muscle was significantly higher than that of the active muscle Average conduction velocity.