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首页> 外文期刊>Journal of Neurophysiology >Rectification is required to extract oscillatory envelope modulation from surface electromyographic signals
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Rectification is required to extract oscillatory envelope modulation from surface electromyographic signals

机译：需要整流以从表面肌电信号中提取振荡包络调制

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Rectification of surface electromyographic (EMG) recordings prior to their correlation with other signals is a widely used form of preprocessing. Recently this practice has come into question, elevating the subject of EMG rectification to a topic of much debate. Proponents for rectifying suggest it accentuates the EMG spike timing information, whereas opponents indicate it is unnecessary and its nonlinear distortion of data is potentially destructive. Here we examine the necessity of rectification on the extraction of muscle responses, but for the first time using a known oscillatory input to the muscle in the form of electrical vestibular stimulation. Participants were exposed to sinusoidal vestibular stimuli while surface and intramuscular EMG were recorded from the left medial gastrocnemius. We compared the unrectified and rectified surface EMG to single motor units to determine which method best identified stimulus-EMG coherence and phase at the single-motor unit level. Surface EMG modulation at the stimulus frequency was obvious in the unrectified surface EMG. However, this modulation was not identified by the fast Fourier transform, and therefore stimulus coherence with the unrectified EMG signal failed to capture this covariance. Both the rectified surface EMG and single motor units displayed significant coherence over the entire stimulus bandwidth (1–20 Hz). Furthermore, the stimulus-phase relationship for the rectified EMG and motor units shared a moderate correlation (r = 0.56). These data indicate that rectification of surface EMG is a necessary step to extract EMG envelope modulation due to motor unit entrainment to a known stimulus.
机译：在与其他信号相关之前，对表面肌电（EMG）记录进行校正是一种广泛使用的预处理形式。最近，这种做法受到了质疑，将EMG整顿的主题提升到了一个备受争议的话题。支持纠正的建议表明，它会增强EMG尖峰定时信息，而反对者则指出这是不必要的，并且其数据的非线性失真可能具有破坏性。在这里，我们研究了对提取肌肉反应进行矫正的必要性，但是这是第一次使用已知的以电前庭刺激形式向肌肉发出的振荡输入。参与者暴露于正弦前庭刺激，同时记录左内侧腓肠肌的表面和肌内肌电图。我们将未整流和已整流的表面肌电图与单电机单元进行了比较，以确定哪种方法可以最好地识别单电机单元水平上的刺激-EMG相干性和相位。在未整流的表面肌电图上，刺激频率下的表面肌电图调制很明显。但是，这种调制不能通过快速傅立叶变换来识别，因此与未校正的EMG信号的刺激相干性无法捕获该协方差。整流的表面肌电图和单个电动机单元在整个刺激带宽（1–20 Hz）上均显示出显着的一致性。此外，整流后的肌电图和运动单元的刺激-相位关系具有适度的相关性（r = 0.56）。这些数据表明，由于运动单元夹带到已知刺激中，表面EMG的整流是提取EMG包络调制的必要步骤。

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