Chuang Tyler D, Acker Stacey M
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada.
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada.
J Electromyogr Kinesiol. 2019 Feb;44:86-93. doi: 10.1016/j.jelekin.2018.11.014. Epub 2018 Dec 1.
There is no consensus on the most appropriate method for normalizing an individual's electromyography (EMG) signals from walking, cycling and running in the same data collection. The aim of this study was to compare how the magnitude and repeatability of normalization values differ from three normalization methods and to compare their scaling effect in three moderate intensity activities. Three rounds of maximal voluntary isometric contractions (MVICs), sprint cycling and sprint running were performed to obtain normalization values for each method. EMG from five moderate intensity trials of walking, cycling and running were performed and normalized using each normalization value. Normalization values, coefficients of variation, and peak normalized EMG from the three moderate intensity activities were compared across normalization methods. Sprint running resulted in greater normalization values for 6/9 muscles. MVICs produced the lowest variance in 6/9 muscles. Comparing peak normalized signals of interest across normalization methods, there were significant differences in 6/9, 7/9 and 8/9 muscles for walking, cycling and running, respectively. When investigating a combination of walking, cycling and/or running EMG data, sprint running could be used for normalization, due to its simplicity and its ability to produce a larger normalization value, despite lower repeatability.
在同一数据采集中，对于将个体在步行、骑自行车和跑步时的肌电图（EMG）信号进行标准化的最合适方法，目前尚无共识。本研究的目的是比较三种标准化方法的标准化值在大小和可重复性上的差异，并比较它们在三种中等强度活动中的缩放效果。进行了三轮最大自主等长收缩（MVIC）、冲刺骑行和冲刺跑，以获得每种方法的标准化值。对步行、骑自行车和跑步的五次中等强度试验的肌电图进行了测量，并使用每个标准化值进行标准化。比较了三种中等强度活动的标准化值、变异系数和峰值标准化肌电图在不同标准化方法之间的差异。冲刺跑导致9块肌肉中的6块获得更大的标准化值。MVIC在9块肌肉中的6块产生了最低的方差。比较不同标准化方法下感兴趣的峰值标准化信号，步行、骑自行车和跑步时，9块肌肉中的6块、7块和8块分别存在显著差异。在研究步行、骑自行车和/或跑步肌电图数据的组合时，尽管冲刺跑的可重复性较低，但由于其简单性以及能够产生更大的标准化值，可用于标准化。
