Influence of anatomical, physical, and detection-system parameters on surface EMG
Influence of anatomical, physical, and detection-system parameters on surface EMG
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DOI：
10.1007/s00422-002-0309-2
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发表时间：
2002-06-01
影响因子：
1.9
通讯作者：
Merletti, R
中科院分区：
文献类型：
--
作者：
Farina, D;Cescon, C;Merletti, R
之前的许多研究都集中在解剖学、物理和检测系统参数对记录的表面肌电图信号的影响。其中大部分是通过模拟进行的。以前的肌电图模型受到简化的限制，无法模拟肌电图生成和检测系统的多个方面。我们最近提出了一种快速准确模拟表面肌电图的模型。它将体积导体描述为非均匀且各向异性介质，并且允许模拟由有限长度纤维生成的 EMG 信号，而无需近似电流密度源。本文研究了皮下组织层厚度、纤维倾斜度、纤维深度、电极尺寸和形状、空间滤波器传递函数、电极间距离、表面纤维长度、单纤维动作电位幅度、频率含量和估计传导速度的影响。讨论了结果对电极定位程序、空间滤波器设计和肌电图信号解释的影响。
Many previous studies were focused on the influence of anatomical, physical, and detection-system parameters on recorded surface EMG signals. Most of them were conducted by simulations. Previous EMG models have been limited by simplifications which did not allow simulation of several aspects of the EMG generation and detection systems. We recently proposed a model for fast and accurate simulation of the surface EMG. It characterizes the volume conductor as a non-homogeneous and anisotropic medium, and allows simulation of EMG signals generated by finite-length fibers without approximation of the current-density source. The influence of thickness of the subcutaneous tissue layers, fiber inclination, fiber depth, electrode size and shape, spatial filter transfer function, interelectrode distance, length of the fibers on surface, single-fiber action-potential amplitude, frequency content, and estimated conduction velocity are investigated in this paper. Implications of the results on electrode positioning procedures, spatial filter design, and EMG signal interpretation are discussed.