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首页> 外文期刊>Journal of Biomechanics >Insights gained into the interpretation of surface electromyograms from the gastrocnemius muscles: A simulation study.
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Insights gained into the interpretation of surface electromyograms from the gastrocnemius muscles: A simulation study.

机译：从腓肠肌肌肉肌肉释放表面电谱的解释中获得的见解：模拟研究。

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摘要

Interpretation of surface electromyograms (EMG) is usually based on the assumption that the surface representation of action potentials does not change during their propagation. This assumption does not hold for muscles whose fibers are oblique to the skin. Consequently, the interpretation of surface EMGs recorded from pinnate muscles unlikely prompts from current knowledge. Here we present a complete analytical model that supports the interpretation of experimental EMGs detected from muscles with oblique architecture. EMGs were recorded from the medial gastrocnemius muscle during voluntary and electrically elicited contractions. Preliminary indications obtained from simulated and experimental signals concern the spatial localization of surface potentials and the myoelectric fatigue. Specifically, the spatial distribution of surface EMGs was localized about the fibers superficial extremity. Strikingly, this localization increased with the pinnation angle, both for the simulated EMGs and the recorded M-waves. Moreover, the average rectified value (ARV) and the mean frequency (MNF) of interference EMGs increased and decreased with simulated fatigue, respectively. The degree of variation in ARV and MNF did not depend on the pinnation angle simulated. Similar variations were observed for the experimental EMGs, although being less evident for a higher fiber inclination. These results are discussed on a physiological context, highlighting the relevance of the model proposed here for the interpretation of gastrocnemius EMGs and for conceiving future experiments on muscles with pinnate geometry.
机译：对表面电谱（EMG）的解释通常基于假设动作电位的表面表示在其传播期间不会改变。这种假设不适用于肌肉，其纤维倾向于皮肤。因此，从Pinnate肌肉记录的表面EMG的解释不太可能来自当前知识。在这里，我们提出了一个完整的分析模型，支持从倾斜架构中检测到的肌肉的实验EMG的解释。在自愿和电引发收缩期间从内侧胃肠肌中记录EMG。从模拟和实验信号获得的初步指示涉及表面电位的空间定位和肌电疲劳。具体地，表面EMG的空间分布局部地围绕纤维浅表末端。尖锐地，这种定位随着针刺和记录的M波的针刺角度而增加。此外，随着模拟疲劳的平均整流值（ARV）和平均频率（ARV）和平均频率（MNF）分别增加和降低了模拟疲劳。 ARV和MNF的变化程度不依赖于模拟的垂直角度。对于实验EMG，观察到类似的变化，尽管对于更高的纤维倾斜度不太明显。这些结果在生理背景上讨论，突出了本文所提出的模型的相关性，用于解释腓肠肌EMG，并用于对未来的肌肉进行羽毛几何形状来构思未来的实验。

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