Rectification of the EMG Signal Impairs the Identification of Oscillatory Input to the Muscle
Rectification of the EMG Signal Impairs the Identification of Oscillatory Input to the Muscle
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DOI：
10.1152/jn.00792.2009
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发表时间：
2010-02-01
影响因子：
2.5
通讯作者：
Christou, Evangelos A.
中科院分区：
文献类型：
--
作者：
Pinto Neto, Osmar;Christou, Evangelos A.
Neto OP，Christou EA。EMG信号的整流削弱了对肌肉的振荡输入的识别。J Neurophysiol 103：1093-1103，2010.首次发表于2009年12月23日; doi：10.1152/jn.00792.2009。EMG信号的校正是在执行脑电图-肌电图（EEG-EMG）相干性和EMG-EMG相干性时使用的常见处理步骤。然而，众所周知，EMG整流改变了记录的EMG信号的功率谱（干扰EMG）。本研究的目的是确定EMG信号的整流是否影响捕获单个EMG信号的振荡输入和两个EMG信号之间的共同振荡的能力。从实验记录的第一背侧骨间肌表面的肌电信号重建几个肌电信号，并将其操纵为具有振荡输入或共同输入（对于成对的重构EMG信号）（以Hz计：0-12、12-30、30-50、50-100、100-150、150-200、200-250、250-300和300-400），一次一个。从每个频带量化功率、峰值功率和峰值相干性（对于EMG信号对）的绝对积分和归一化积分。干扰EMG的功率谱准确地检测到重构EMG信号的振荡输入的变化，而整流EMG的功率谱没有。类似地，两个干扰EMG信号之间的EMG-EMG相干性准确地检测到重构EMG信号对的共同输入，而两个整流EMG信号之间的EMG-EMG相干性没有。100 ~ 150 Hz输入对整流后肌电信号功率谱中12 ~ 30 Hz频段及两个整流信号间的肌电信号-肌电信号相干性有影响，而12 ~ 30 Hz输入对整流后肌电信号功率谱中12 ~ 30 Hz频段及两个整流信号间的肌电信号-肌电信号相干性无影响。该研究的结论是，功率谱的EMG和EMG-EMG的相干性，应进行干扰EMG信号，而不是整流的EMG信号，因为整流削弱了识别的振荡输入到一个单一的EMG信号和两个EMG信号之间的共同的振荡输入。
Neto OP, Christou EA. Rectification of the EMG signal impairs the identification of oscillatory input to the muscle. J Neurophysiol 103: 1093-1103, 2010. First published December 23, 2009; doi:10.1152/jn.00792.2009. Rectification of EMG signals is a common processing step used when performing electroencephalographic-electromyographic (EEG-EMG) coherence and EMG-EMG coherence. It is well known, however, that EMG rectification alters the power spectrum of the recorded EMG signal (interference EMG). The purpose of this study was to determine whether rectification of the EMG signal influences the capability of capturing the oscillatory input to a single EMG signal and the common oscillations between two EMG signals. Several EMG signals were reconstructed from experimentally recorded EMG signals from the surface of the first dorsal interosseus muscle and were manipulated to have an oscillatory input or common input (for pairs of reconstructed EMG signals) at various frequency bands (in Hz: 0-12, 12-30, 30-50, 50-100, 100-150, 150-200, 200-250, 250-300, and 300-400), one at a time. The absolute integral and normalized integral of power, peak power, and peak coherence (for pairs of EMG signals) were quantified from each frequency band. The power spectrum of the interference EMG accurately detected the changes to the oscillatory input to the reconstructed EMG signal, whereas the power spectrum of the rectified EMG did not. Similarly, the EMG-EMG coherence between two interference EMG signals accurately detected the common input to the pairs of reconstructed EMG signals, whereas the EMG-EMG coherence between two rectified EMG signals did not. The frequency band from 12 to 30 Hz in the power spectrum of the rectified EMG and the EMG-EMG coherence between two rectified signals was influenced by the input from 100 to 150 Hz but not from the input from 12 to 30 Hz. The study concludes that the power spectrum of the EMG and EMG-EMG coherence should be performed on interference EMG signals and not on rectified EMG signals because rectification impairs the identification of the oscillatory input to a single EMG signal and the common oscillatory input between two EMG signals.