Simulation of surface EMG signals generated by muscle tissues with inhomogeneity due to fiber pinnation
Simulation of surface EMG signals generated by muscle tissues with inhomogeneity due to fiber pinnation
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DOI：
10.1109/tbme.2004.827551
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发表时间：
2004-09-01
影响因子：
4.6
通讯作者：
Farina, D
中科院分区：
文献类型：
--
作者：
Mesin, L;Farina, D
表面肌电信号建模在实验肌电数据解释中有着重要的应用。大多数表面肌电信号产生的模型认为体导体在动作电位的传播方向上是均匀的。然而，由于局部组织不均匀或可能存在具有不同取向的肌纤维组的事实，实际情况可能并非如此。这项研究解决了解析地描述由双回羽肌产生的表面EMG信号的问题，即具有两组具有两个方向的纤维的肌肉。这种方法也将适用于肌肉纤维沿深度方向倾斜的情况。这种肌肉解剖在动作电位的传播方向上是不均匀的，结果是该系统在源传播方向上不能被描述为空间不变。在这些情况下，在皮肤表面检测到的电位不会在没有形状变化的情况下移动。这决定了模型实施中的数值问题，这些问题在本工作中得到了解决。该研究给出了非均匀、各向异性问题的解决方案，提出了在完整的表面肌电产生模型(包括有限长度的光纤)中的结果的实现，并给出了所提出的模型的典型应用结果。
Surface electromyographic (EMG) signal modeling has important applications in the interpretation of experimental EMG data. Most models of surface EMG generation considered volume conductors homogeneous in the direction of propagation of the action potentials. However, this may not be the case in practice due to local tissue inhomogeneities or to the fact that there may be groups of muscle fibers with different orientations. This study addresses the issue of analytically describing surface EMG signals generated by bi-pinnate muscles, i.e., muscles which have two groups of fibers with two orientations. The approach will also be adapted to the case of a muscle with fibers inclined in the depth direction. Such muscle anatomies are inhomogeneous in the direction of propagation of the action potentials with the consequence that the system can not be described as space invariant in the direction of source propagation. In these conditions, the potentials detected at the skin surface do not travel without shape changes. This determines numerical issues in the implementation of the model which are addressed in this work. The study provides the solution of the nonhomogenous, anisotropic problem, proposes an implementation of the results in complete surface EMG generation models (including finite-length fibers), and shows representative results of the application of the models proposed.