Effects of electrocardiography contamination and comparison of ECG removal methods on upper trapezius electromyography recordings.
Effects of electrocardiography contamination and comparison of ECG removal methods on upper trapezius electromyography recordings.
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DOI：
10.1016/j.jelekin.2014.08.003
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发表时间：
2014-12
影响因子：
2.5
通讯作者：
Maluf, Katrina S.
中科院分区：
文献类型：
--
作者：
Marker, Ryan J.;Maluf, Katrina S.
来自腓肠肌的肌电图（EMG）记录经常被心电图（ECG）信号污染，使得难以区分低水平的肌肉活动和肌肉休息。本研究探讨了在肌肉休息和低水平收缩时，ECG污染对上睑肌EMG幅度和频率估计的影响。本文介绍了一种新的去除心电图污染的方法-滤波模板减法（FTS），并与30 Hz高通滤波器（HPF）和平均模板减法（ATS）方法进行了比较。FTS使用污染信号的低通滤波副本创建每个ECG伪影的唯一模板，该模板从原始信号中的污染时段中减去。ECG污染导致在休息期间在上回旋肌中的EMG振幅的高估，在低强度等长收缩期间对振幅和频率估计的影响可以忽略不计。FTS和HPF成功地消除了肌肉休息期间的ECG污染，但在肌肉收缩期间引入了错误。相反，ATS在肌肉休息期间未能完全去除ECG污染，但在肌肉收缩期间没有引入错误。不同ECG污染去除方法的相对优点和缺点应在需要分析的特定运动任务的背景下考虑。
Electromyography (EMG) recordings from the trapezius are often contaminated by the electrocardiography (ECG) signal, making it difficult to distinguish low-level muscle activity from muscular rest. This study investigates the influence of ECG contamination on EMG amplitude and frequency estimations in the upper trapezius during muscular rest and low-level contractions. A new method of ECG contamination removal, filtered template subtraction (FTS), is described and compared to 30 Hz high-pass filter (HPF) and averaged template subtraction (ATS) methods. FTS creates a unique template of each ECG artifact using a low-pass filtered copy of the contaminated signal, which is subtracted from contaminated periods in the original signal. ECG contamination results in an over-estimation of EMG amplitude during rest in the upper trapezius, with negligible effects on amplitude and frequency estimations during low-intensity isometric contractions. FTS and HPF successfully removed ECG contamination from periods of muscular rest, yet introduced errors during muscle contraction. Conversely, ATS failed to fully remove ECG contamination during muscular rest, yet did not introduce errors during muscle contraction. The relative advantages and disadvantages of different ECG contamination removal methods should be considered in the context of the specific motor tasks that require analysis.
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