Related Experiment Video
Updated: Jan 9, 2026
08:36
Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
12.6K
Identifying Military Rotary-Wing Pilots at Increased Risk of Fatigue Using Biomathematical Modeling
Aerospace Medicine and Human Performance
|December 8, 2025
Summary
Biomathematical fatigue modeling identified British military pilots at higher risk. Night flying, deployments, and having infants under one year old were associated with increased fatigue.
Area of Science:
- Aerospace Medicine
- Human Factors Engineering
- Occupational Health
Background:
- British military rotary-wing pilots were studied to identify fatigue risks.
- Actigraphy-driven fatigue modeling was employed to assess pilot fatigue.
Purpose of the Study:
- To identify groups of military rotary-wing pilots at increased risk of fatigue.
- To assess the relationship between workplace activities and subjective/objective fatigue levels.
Main Methods:
- Wearable actigraphy and the Sleep Activity Fatigue Task Effectiveness (SAFTE) model predicted objective fatigue.
- Subjective fatigue was assessed using daily questionnaires and Samn-Perelli scores.
- Data from 38 men and 2 women pilots across UK military services were analyzed.
Main Results:
- SAFTE scores declined significantly after 22:00, indicating increased fatigue during night flying.
- Pilots on deployment experienced higher subjective and objective fatigue.
- Pilots with infants under one year old reported greater fatigue decrements.
- Inexperienced pilots reported more subjectively fatiguing flights than instructors.
Conclusions:
- Biomathematical fatigue modeling, specifically SAFTE, is valuable in military aviation.
- Fatigue modeling should be considered for night flying, deployed flights, and pilots with young children.
- Further research is needed to understand fatigue in inexperienced pilots.
