Bräuer D, Seidel H, Beyer H
Biomed Biochim Acta. 1986;45(1-2):S89-92.
The experiment aimed at elucidating electromyographic signs of fatigue of lumbar muscles. On two days, 4 subjects had to hold 4 different target forces to fatigue. Bipolar surface EMG's were derived at the L3 level. The time series structure of the EMG's was characterized by means of autoregressive models. The r.m.s.- value did not reveal uniform time-dependent changes, except for an increase during the highest force level. The variance explained by a linear stochastic process systematically increased during the sustained contractions. The mean power frequencies exhibited similar changes.
该实验旨在阐明腰部肌肉疲劳的肌电图征象。在两天的时间里，4名受试者需保持4种不同的目标力量直至疲劳。在L3水平采集双极表面肌电图。通过自回归模型对肌电图的时间序列结构进行表征。均方根值并未显示出一致的随时间变化情况，除了在最高力量水平时有增加。由线性随机过程解释的方差在持续收缩过程中系统性增加。平均功率频率呈现出类似的变化。
