A comparison of computer-based methods for the determination of onset of muscle contraction using electromyography
A comparison of computer-based methods for the determination of onset of muscle contraction using electromyography
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DOI：
10.1016/s0013-4694(96)95190-5
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发表时间：
1996-12-01
期刊：
影响因子：
--
通讯作者：
Bui, BH
中科院分区：
文献类型：
--
作者：
Hodges, PW;Bui, BH
关于肌电图（EMG）活动开始的确定方法，文献中几乎没有共识。本研究的目的是比较一系列的基于计算机的技术相对于肌电图发作由一个有经验的考官视觉确定的相对准确性。比较了27种方法，这些方法在EMG处理（10、50和500 Hz的低通滤波）、阈值（超过基线活动平均值的1、2和3 SD）以及平均值必须超过定义阈值（20、50和100 ms）的样本数量方面有所不同。使用每种技术对300个随机选择的姿势任务试验进行了评估。发现EMG发作的视觉测定在几天之间具有高度可重复性。计算每种计算机方法选择的值的线性回归方程，表明大多数参数组合选择的起始值显著偏离目视推导的起始值。有几种方法准确地选择了肌电图活动的发作时间，并建议将来使用。版权所有（C）1996 Elsevier Science爱尔兰有限公司
Little consensus exists in the literature regarding methods for determination of the onset of electromyographic (EMG) activity. The aim of this study was to compare the relative accuracy of a range of computer-based techniques with respect to EMG onset determined visually by an experienced examiner. Twenty-seven methods were compared which varied in terms of EMG processing (low pass filtering at 10, 50 and 500 Hz), threshold value (1, 2 and 3 SD beyond mean of baseline activity) and the number of samples for which the mean must exceed the defined threshold (20, 50 and 100 ms). Three hundred randomly selected trials of a postural task were evaluated using each technique. The visual determination of EMG onset was found to be highly repeatable between days. Linear regression equations were calculated for the values selected by each computer method which indicated that the onset values selected by the majority of the parameter combinations deviated significantly from the visually derived onset values. Several methods accurately selected the time of onset of EMG activity and are recommended for future use. Copyright (C) 1996 Elsevier Science Ireland Ltd.