The effect of sustained fatigue during an upper limb isometric exercise is presented to investigate a group of healthy subjects with simultaneous time-domain (TD) NIRS and surface electromyography (sEMG) recordings on the deltoid lateralis muscle. The aim of the work was to understand which TD-NIRS parameters can be used as descriptors for sustained muscular fatigue, focusing on the slow phase of this process and using median frequency (MF) computed from sEMG as gold standard measure. It was found that oxygen saturation and deoxy-hemoglobin are slightly better descriptors of sustained fatigue, than oxy-hemoglobin, since they showed a higher correlation with MF, while total-hemoglobin correlation with MF was lower.

中文翻译：

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使用时域近红外光谱和表面肌电图信号进行等距运动期间的持续疲劳评估

提出了上肢等轴测运动中持续疲劳的影响，以调查一组健康受试者，同时在三角肌外侧肌上同时进行时域（TD）NIRS和表面肌电图（sEMG）记录。这项工作的目的是了解哪些TD-NIRS参数可以用作持续性肌肉疲劳的描述符，重点是该过程的缓慢阶段，并使用从sEMG计算出的中值频率（MF）作为金标准度量。已发现，氧饱和度和脱氧血红蛋白比氧合血红蛋白更好地表示持续疲劳，因为它们与MF的相关性较高，而总血红蛋白与MF的相关性较低。