表面肌电的非线性动力学初步分析

目的 探讨表面肌电（ＥＭＧ）的非线性特征。方法 用非线性动力学中的复杂度、关联时间、关联维和李雅普诺夫指数和熵五个物理量，对一对收缩肌和舒张肌进行了分析。结果 肌肉舒张时ＥＭＧ更具随机性，肌肉收缩时ＥＭＧ更具规律性。结论 作为分析判断肌肉处于收缩还是舒张状态，除了常规的ＥＭＧ平均幅值和频率外，还可用复杂度、关联时间、李氏指数和熵等非线性特征量更好地标志和度量。

The Preliminary Nonlinear Dynamical Analysis of Surface Electromyogram

Objective To study the nonlinear characteristics of the surface electromyogram(EMG). Method EMG was studied with physical quantities(i.e. complexity, correlation time, correlation dimension, Lyapunov exponent and entropy) which are commonly used in nonlinear dynamics. Result Pairs of contracted and relaxed muscles were analyzed. The results show that EMG is more stochastic in the contracted state and more regular in the relaxed state. ConclusionBZ Except for the amplitude of EMG used in conventional method, quantities used in nonlinear dynamics such as complexity, correlation time Lyapunov exponent etc, are also helpful in defining the characteristics of EMG.