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. 2021 Dec 15;12:790292. doi: 10.3389/fphys.2021.790292

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Copyright © 2021 Adão Martins, Annaheim, Spengler and Rossi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Physiological and motion signals for (A) mental fatigue, (B) vigilance, (C) drowsiness, (D) muscle fatigue, (E) physical fatigue monitoring and respective measurement locations. The fraction number in the boxes represents the number of studies on a specific signal based on the total literature reviewed on that type of fatigue. ECG, electroencephalogram; EEG, electroencephalogram; EMG, electromyogram; EOG, electrooculogram; EYE, eye movement; GSR, galvanic skin response; MOT, motion; NIRS, near-infra-red spectroscopy; PPG, photoplethysmogram; RES, respiration; T_Sk, skin temperature.