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Fatigue Countermeasures in Aviation
Abstract
Pilot fatigue is a significant problem in modern aviation operations, largely because of the unpredictable work hours, long duty periods, circadian disruptions, and insufficient sleep that are commonplace in both civilian and military flight operations. The full impact of fatigue is often underappreciated, but many of its deleterious effects have long been known. Compared to people who are well-rested, people who are sleep deprived think and move more slowly, make more mistakes, and have memory difficulties. These negative effects may and do lead to aviation errors and accidents. In the 1930s, flight time limitations, suggested layover durations, and aircrew sleep recommendations were developed in an attempt to mitigate aircrew fatigue. Unfortunately, there have been few changes to aircrew scheduling provisions and flight time limitations since the time they were first introduced, despite evidence that updates are needed. Although the scientific understanding of fatigue, sleep, shift work, and circadian physiology has advanced significantly over the past several decades, current regulations and industry practices have in large part failed to adequately incorporate the new knowledge. Thus, the problem of pilot fatigue has steadily increased along with fatigue-related concerns over air safety. Accident statistics, reports from pilots themselves, and operational flight studies all show that fatigue is a growing concern within aviation operations. This position paper reviews the…
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“ATCO alertness level has been proven to be closely linked with task load and circadian rhythm (Caldwell, et al., 2009).”
From The Analysis of Occurrences Associated with Air Traffic Volume and Air Traffic Controllers’ Alertness for Fatigue Risk Management (2021) · cites this paper as Caldwell, et al., 2009
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“Similar objective duty time systems are employed in the aviation industry where alertness on duty is critical, as part of Fatigue Risk Management Systems [24].”
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Sieberichs, S., & Kluge, A. (2018) · Aviation Psychology and Applied Human Factors · doi:10.1027/2192-0923/a000143 · Cited by 5
“Napping should be seen as a tool to actively manage any possible risks arising from fatigue, since it improves alertness and sustains performance in the case of operational delay in phases of circadian low points (Caldwell et al., 2009).”
InfluentialToward Better Understanding of Function Allocation Requirements for Planetary Eva and Habitat Tasks
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“Alternatively, some recommend light physical activity during breaks as a means of raising energy levels.53 Along with napping, the only other effective countermeasure to fatigue is caffeine.2 A 150mg dose of caffeine (roughly equivalent to a cup of filter coffee) can raise alertness within 15–20min (and is hence somet…”
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Behavioural Curves Analysis Using Near-Infrared-Iris Image Sequences
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“In literature, napping stands out as the most effective nonpharmacological technique for restoring alertness and psychomotor performance [34].”
BackgroundMethodSleep latency in poor nappers under exposure to weak 2-Hz and 8-Hz electromagnetic fields
Dorokhov, V., Taranov, A., Sakharov, D., Gruzdeva, S., Arsenyev, G., Ligun, N. V., Gandina, E. O., Bakaeva, Z. B., Dementienko, V., & Tkachenko, O. (2021) · Biological rhythm research · doi:10.1080/09291016.2021.1962087 · Cited by 1
Fatigue and Associated Factors among Airline Pilots
Kim, H. J., & Choi, Y. Y. (2021) · The Korean Journal of Aerospace and Environmental Medicine · doi:10.46246/kjasem.210009 · Cited by 6
The Effect of Korean Flight Crews’ Expertise on Long-Haul Flight Fatigue
Lee, J. Y., Shin, Y. H., & Sohn, Y. W. (2021) · Journal of the Korean Society for Aviation and Aeronautics · doi:10.12985/ksaa.2021.29.2.067 · Cited by 1
“Caldwell et al.(2009)에 따르면 비행 중 쪽잠이 운항승무원의 피로 수준에 긍정적인 영향을 미 친다고 하였다.”
Os riscos da fadiga humana para a segurança operacional de voo
Quintino, W. S., & dos Santos, R. M. (2020) · doi:10.32749/nucleodoconhecimento.com.br/ciencias-aeronauticas/fadiga-humana · Cited by 1
Impact of Smoking and Smoking Cessation Medications in Aviators
Dailey, J. I., & Wilson, K. (2019) · Current Psychiatry Reports · doi:10.1007/s11920-019-1109-x · Cited by 1
Flight hours within 7 days and risk of fatigue on the civilian pilots in Indonesia
Hidayat, F. (2017) · doi:10.22435/hsji.v8i1.6804.53-58 · Cited by 1
“The FSS questions were: (1) my motivation is lower when I am fatigued; (2) exercise brings on my fatigue; (3) I am easily fatigued; (4) fatigue interferes with my physical functioning; (5) fatigue causes frequent problem for me; (6) my fatigue prevents sustained physical functioning; (7) fatigue interferes with carryi…”
BackgroundBoyer, S. (2016) · doi:10.70675/61ae8af8ze140z40dcz9e6cz070ad3b126e4 · Cited by 1
“…de l’EEG Parmi toutes les mesures disponibles pour l’évaluation de l’état de somnolence et du niveau de charge mentale, l’EEG apparaît comme une des techniques les plus sensibles, prédictives et fiables (Gevins & Smith, 2003 ; Caldwell et al., 2009 ; Barwick et al., 2012 ; Sauvet et al., 2014).”
BackgroundMcFarlane, S. J., Garcia, J. E., & Dyer, A. (2021) · doi:10.35248/2167-0277.21.10.326 · Cited by 1
Study on the Workload of 12 h Simulated Flight Continuously Across Day and Night
Wu, F., Tian, D.-W., Ge, H., Bai, S., Zhao, A.-D., Wang, R., Zhao, Y., Wang, Q., & Deng, L. (2020) · doi:10.1007/978-981-15-6978-4_16 · Cited by 1
Köhler, T. S., & Schwartz, B. (2018) · Cambridge International Law Journal · doi:10.1007/978-3-319-64728-9 · Cited by 1
A Sleep Primer for Military Psychologists
Campbell, J. S., Markwald, R. R., Chinoy, E. D., Germain, A., Grieser, E., Lim, I. C., & Bowles, S. V. (2017) · Springer eBooks · doi:10.1007/978-3-319-66192-6_15 · Cited by 3
Economic Impact of Sleep Deprivation
Parish, J. (2013) · Elsevier eBooks · doi:10.1016/b978-0-12-378610-4.00239-4 · Cited by 1
Wege aus der müden (Arbeits-)Gesellschaft: Erklärungsmodelle, Messansätze und Gegenmaßnahmen
Krajewski, J., Mühlenbrock, I., Schnieder, S., & Seiler, K. (2011) · Zeitschrift für Arbeitswissenschaft · doi:10.1007/bf03373824 · Cited by 2
Cao, Y., Zhou, Y. J., Guan, Z., Chung, H., Fu, X., & Ding, H. (2026) · Transportation Research Part A Policy and Practice · doi:10.1016/j.tra.2026.105265
Parihar, N. (2026) · Natural Resources for Human Health · doi:10.53365/nrfhh.2796
“…at the individual level as a set of skills, such as mindfulness and cognitive flexibility, that counteract stress-induced deficits [8], whereas others argue that a focus on aircrew alone neglects systemic factors such as overextended duty hours, circadian disruption, and inadequate monitoring [22].”
Aerospace stressors and brain health in military aviators: a glymphatic–neurovascular framework
Ramirez, J., Marraffino, V. N., Anirud, U. A., & Rhind, S. G. (2026) · Frontiers in Physiology · doi:10.3389/fphys.2026.1953796
“The Aerospace Medical Association position paper led by Caldwell et al. (2009) synthesized the effects of sleep loss, extended wakefulness, circadian disruption, and irregular operations and emphasized layered countermeasures, with adequate sleep as the primary physiological requirement.”
From Keypoints to Predictive Distributions: Post-Hoc Uncertainty for YOLO-Pose Models
Klushyn, A., Sesma, J. R., Seligmann, F., Kurle, R., Tieu, K. H., & Gupta, J. S. (2026) · arXiv.org · doi:10.48550/arxiv.2607.26921
“At the same time, there is a strong operational incentive to increase the availability of automatic landing capability, for example, to support robust all-weather operations and reduce flight-crew workload during demanding approach and landing phases (Caldwell et al., 2009).”
Wicaksono, A. W., Wayam, D. J. O., & Globalisasi, S. E. (2026) · Jurnal Penelitian · doi:10.46491/jp.v20i1.2522
“Reported errors in ATC communication, briefing recall, procedural execution, and aircraft-control focus are consistent with evidence that fatigue reduces vigilance, working memory, cognitive flexibility, and decision quality (Caldwell et al., 2009; O'Hagan et al., 2018; Rosa et al., 2021).”
Fatuzzo, S., Koziatek, C., Graulty, C., Ruggiero, M., Kim, J. G., Smalley, S., Keeley, K., Wang, Y., Offenbacher, J., Smith, S. W., et al. (2026) · Annals of Emergency Medicine · doi:10.1016/j.annemergmed.2026.05.004
Extended Work Periods Among Anesthesiologists and Postoperative Patient Outcomes
Dixit, A. A., Deverett, B., & Sun, E. C. (2026) · JAMA Network Open · doi:10.1001/jamanetworkopen.2026.11644 · Cited by 2
Axelsson, J., Lekander, M., Svensson, C. I., Simon, N., Kuliszkiewicz, A., Lasselin, J., & Balter, L. J. T. (2026) · Journal of Sleep Research · doi:10.1111/jsr.70335
“Such strategies have been documented primarily in short-term, high-demand, or task-constrained contexts where disengagement is no option (e.g., pilots during active flight operations) (Caldwell et al. 2009).”
Sathawane, S., Velayudhan, J., & Veluppal, A. (2026) · International Conference on Communications and Signal Processing (ICCSP) · doi:10.1109/iccsp68173.2026.11539740 · Cited by 1
“…approaches can be summed up into three categories, namely: (1) the problem of reporting bias, where respondents underestimate their symptoms due to work-related stress [3]; (2) lack of continuity in time, whereby the test cannot account for changes in the condition; and (3) perceptual lag [12].”
Metadata
- Authors
- Caldwell, J. A., Mallis, M. M., Caldwell, J. L., Paul, M. A., Miller, J. C., & Neri, D. F.
- Affiliations
- Archinoetics (United States) (US)
- Venue
- Aviation, Space, and Environmental Medicine
- Publisher
- Aerospace Medical Association
- Published
- 2009-01-01
- Volume
- 80
- Issue
- 1
- Pages
- 29-59
- ISSN
- 0001-9402 (ISSN-L)
- 0095-6562
- OpenAlex
- W1987324686
- Cited by
- 295
- References
- 166
- Citations by year
- 2026: 22 · 2025: 23 · 2024: 16 · 2023: 19 · 2022: 21 · 2021: 24 · 2020: 27 · 2019: 25 · 2018: 24 · 2017: 15 · 2016: 12 · 2015: 12 · 2014: 9 · 2013: 16 · 2012: 5
- FWCI
- 13.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Aviation Space and Environmental Medicine (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Social Sciences › Human Factors and Ergonomics › Human-Automation Interaction and Safety
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Keywords
- pilot fatigue, fatigue countermeasures, aviation safety, flight time limitations, circadian rhythm disruption, shift work, sleep deprivation, aviation law, aviation accidents, military aviation, civil aviation
- MeSH terms
- Accidents, Aviation, Aerospace Medicine, Central Nervous System Stimulants, Circadian Rhythm, Fatigue, Humans, Hypnotics and Sedatives, Rest, Sleep Deprivation, Task Performance and Analysis, United States, Wakefulness, Work Schedule Tolerance, Occupational Health, Workload, Guidelines as Topic
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