PaperPMID 15018265
Fatigue models for applied research in warfighting
Aviat Space Environ Med 2004;75(3 Suppl):A44–A53 (discussion A54–A60)
TL;DR
Describes the DoD working fatigue model in SAFTE notation (Sleep, Activity, Fatigue, and Task Effectiveness): a sleep-reservoir homeostat that depletes in wake and refills in sleep, circadian modulation, and sleep inertia; output is cognitive effectiveness. Origin: Hursh's 1996 homeostatic model programmed into an actigraph; parameters informed by the WRAIR Sleep Dose-Response study (1 week restricted sleep, 66 subjects). Adds dynamic circadian phase adjustment for transmeridian travel and shift work, and revisions for the persistent effects of chronic restriction.
- Form factor: software (sleep/schedule input; wrist actigraphy optional)
Abstract
The U.S. Department of Defense (DOD) has long pursued applied research concerning fatigue in sustained and continuous military operations. In 1996, Hursh developed a simple homeostatic fatigue model and programmed the model into an actigraph to give a continuous indication of performance. Based on this initial work, the Army conducted a study of 1 wk of restricted sleep in 66 subjects with multiple measures of performance, termed the Sleep Dose-Response Study (SDR). This study provided numerical estimation of parameters for the Walter Reed Army Institute of Research Sleep Performance Model (SPM) and elucidated the relationships among several sleep-related performance measures. Concurrently, Hursh extended the original actigraph modeling structure and software expressions for use in other practical applications. The model became known as the Sleep, Activity, Fatigue, and Task Effectiveness (SAFTE) Model, and Hursh has applied it in the construction of a Fatigue Avoidance Scheduling Tool. This software is designed to help optimize the operational management of aviation ground and flight crews, but is not limited to that application. This paper describes the working fatigue model as it is being developed by the DOD laboratories, using the conceptual framework, vernacular, and notation of the SAFTE Model. At specific points where the SPM may differ from SAFTE, this is discussed. Extensions of the SAFTE Model to incorporate dynamic phase adjustment for both transmeridian relocation and shift work are described. The unexpected persistence of performance effects following chronic sleep restriction found in the SDR study necessitated some revisions of the SAFTE Model that are also described. The paper concludes with a discussion of several important modeling issues that remain to be addressed.
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Cite this paper
Hursh, S. R., Redmond, D. P., Johnson, M. L., Thorne, D. R., Belenky, G., Balkin, T. J., Storm, W. F., Miller, J. C., & Eddy, D. R. (2004). Fatigue models for applied research in warfighting. Aviat Space Environ Med 2004. https://pubmed.ncbi.nlm.nih.gov/15018265/
Hursh, Steven R., Daniel P. Redmond, Michael L. Johnson, David R. Thorne, Gregory Belenky, Thomas J. Balkin, William F. Storm, James C. Miller, and Douglas R. Eddy. 2004. "Fatigue models for applied research in warfighting." Aviat Space Environ Med 2004. https://pubmed.ncbi.nlm.nih.gov/15018265/.
Hursh, S. R., Redmond, D. P., Johnson, M. L., Thorne, D. R., Belenky, G., Balkin, T. J., Storm, W. F., Miller, J. C. and Eddy, D. R. (2004) 'Fatigue models for applied research in warfighting', Aviat Space Environ Med 2004. Available at: https://pubmed.ncbi.nlm.nih.gov/15018265/
Hursh, Steven R., et al. "Fatigue models for applied research in warfighting." Aviat Space Environ Med 2004, 2004. https://pubmed.ncbi.nlm.nih.gov/15018265/.
S. R. Hursh et al., "Fatigue models for applied research in warfighting," Aviat Space Environ Med 2004, 2004, [Online]. Available: https://pubmed.ncbi.nlm.nih.gov/15018265/.
@article{hursh2004fatigue,
title = {{Fatigue models for applied research in warfighting}},
author = {Hursh, Steven R. and Redmond, Daniel P. and Johnson, Michael L. and Thorne, David R. and Belenky, Gregory and Balkin, Thomas J. and Storm, William F. and Miller, James C. and Eddy, Douglas R.},
year = {2004},
journal = {Aviat Space Environ Med 2004},
url = {https://pubmed.ncbi.nlm.nih.gov/15018265/}
}Added to the ChatPPG research hub
