Garcia Marco A C, Catunda João M Y, Lemos Thiago, Oliveira Liliam F, Imbiriba Luis A, Souza Marcio N
Núcleo de Estudos do Movimento Humano (NEMoH) - EEFD, Universidade Federal do Rio de Janeiro, Brazil.
Annu Int Conf IEEE Eng Med Biol Soc. 2010;2010:2419-22. doi: 10.1109/IEMBS.2010.5626163.
The aim of this study was to compare the intervals of time between adjacent zero crossings (ZCI), an alternative frequency-temporal parameter, with the root-mean-square (RMS) value and the median frequency (F(med)) from the surface EMG (sEMG) signal in muscle fatigue analysis. Twenty right-handed volunteers performed isometric contractions of right biceps brachii muscle while sEMG signals were collected from it at three different and arbitrary load levels until fatigue. The mean ZCI presented a significant correlation with F(med) but not with RMS value and it also presented lower coefficients of variation than others. The results pointed that mean ZCI properties can contribute more than F(med) and RMS value on the interpretation of the muscle function under fatigue conditions.
本研究的目的是在肌肉疲劳分析中，将相邻过零点（ZCI）的时间间隔（一种替代频率-时间参数）与表面肌电图（sEMG）信号的均方根（RMS）值和中位频率（F(med)）进行比较。20名右利手志愿者进行右侧肱二头肌的等长收缩，同时在三个不同的任意负荷水平下从该肌肉采集sEMG信号，直至疲劳。平均ZCI与F(med)呈现显著相关性，但与RMS值无显著相关性，并且其变异系数也低于其他参数。结果表明，在疲劳条件下，平均ZCI特性在解释肌肉功能方面比F(med)和RMS值贡献更大。
