Assessment on Stationarity of EMG Signals with Different Windows Size During Isotonic Contractions
Assessment on Stationarity of EMG Signals with Different Windows Size During Isotonic Contractions
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DOI：
10.3390/app7101050
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发表时间：
2017-10-01
影响因子：
2.7
通讯作者：
Zamzuri, Hairi
中科院分区：
文献类型：
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作者：
Nazmi, Nurhazimah;Rahman, Mohd Azizi Abdul;Zamzuri, Hairi
为了对表面肌电信号进行分析，需要提取基于时域或频域的特征。这些方法是基于信号平稳性的数学假设。EMG信号的平稳性被彻底检查，特别是在等张收缩中。根据研究，根据不同的窗口大小，已经确定了相互矛盾的结果。因此，在本研究中，作者努力确定合适的窗口大小，以利用静态测试、反向排列（RA）和修改的反向排列（MRA）来分析等张收缩期间的EMG信号。在100 ms、500 ms和1000 ms窗口大小下，RA和MRA测试的信号平稳性平均百分比略有差异。然而，对于200 ms窗口大小没有。平均而言，与其他窗口大小相比，200 ms的窗口大小提供了88.57%的EMG信号的静态信息。本研究还推荐了MRA测试来确定EMG信号的平稳性，以供将来的研究，因为与RA测试相比，MRA测试的性能更好。然而，以下建议仅对大于200 ms的窗口大小有效。对于实时应用，分析窗口大小和处理时间应小于300 ms，200 ms的窗口大小适用于等张收缩。
In order to analyse surface electromyography (EMG) signals, it is necessary to extract the features based on a time or frequency domain. These approaches are based on the mathematical assumption of signal stationarity. Stationarity of EMG signals is thoroughly examined, especially in isotonic contractions. According to research, conflicting results have been identified depending on varying window sizes. Therefore, in this study, the authors endeavoured to determine the suitable window size to analyse EMG signals during isotonic contractions utilising stationary tests, reverse arrangement (RA), and modified reverse arrangement (MRA). There were slight differences in the average percentages of signal stationarity for RA and MRA tests in 100 ms, 500 ms, and 1000 ms window sizes. However, there was none for the 200 ms window size. On average, a window size of 200 ms provided stationary information with 88.57% of EMG signals compared to other window sizes. This study also recommended the MRA test to determine EMG signals stationarity for future studies, as the performances were better in comparison to RA tests. However, the following recommendation is only valid for window sizes greater than 200 ms. For a real-time application, the size of the analysis window together with the processing time should be less than 300 ms and a window size of 200 ms is applicable for isotonic contractions.