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

Figure 3.

Figure 3

Wearables devised for fatigue monitoring. ECG, electrocardiogram; EEG, electroencephalogram; EOG, electrooculogram; GSR, galvanic skin response; IMU, inertial motion unit; NIRS, near-infra-red spectroscopy; PPG, photoplethysmography; RES, respiration; TSk, skin temperature. 1Reprinted from Zhang et al. (2017). 2© (2015) IEEE. Reprinted, with permission, from Ko et al. (2015). 3Reprinted from Dhole et al., (2019). © (2019) with permission from Elsevier. 4© (2015) IEEE. Reprinted, with permission, from Li et al. (2015). 5Reprinted from Li and Chung (2015). 6Reprinted from Aryal et al. (2017). © (2017) with permission from Elsevier. 7Reprinted (adapted) with permission from Zeng et al. (2020). © (2020) American Chemical Society. 8Reprinted from Huang et al. (2018). © (2018), with permission from Elsevier. 9© (2018) IEEE. Reprinted, with permission, from Choi et al. (2018). 10© (2016) IEEE. Reprinted, with permission, from Ha and Yoo, (2016). 11© (2018) IEEE. Reprinted, with permission, from Nakamura et al. (2018). 12Republished with permission of SAE International, from Niwa et al. (2016); permission conveyed through Copyright Clearance Center, Inc. 13Reprinted with permission of Fuji Technology Press Ltd., from (Wang et al., 2018). 14© (2016) IEEE. Reprinted, with permission, from Mokaya et al. (2016).