Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments.

Area of Science:

• Operational Safety
• Human Factors
• Sleep Medicine

Background:

• Sleep loss and circadian misalignment are significant factors in operational accidents.
• Evaluating fatigue mitigation strategies in real-world settings is crucial but challenging.

Purpose of the Study:

• To present a practical methodology for collecting sleep, circadian, fatigue, and performance data in a complex operational environment.
• To assess the impact of operational flight schedules on pilot sleep, circadian rhythms, and performance.

Main Methods:

• 44 airline pilots participated in a 34-day study with varied flight schedules.
• Sleep was monitored using wrist activity monitors and sleep diaries.
• Circadian phase was assessed via urinary 6-sulfatoxymelatonin (aMT6s) levels.
• Subjective fatigue (Samn-Perelli Scale) and objective performance (Psychomotor Vigilance Task - PVT) were measured via a touchscreen device.

Main Results:

• Reduced sleep duration was observed during early and late flight schedules.
• Circadian phase shifted based on duty schedules, with significant inter-individual variability in aMT6s peaks.
• Psychomotor Vigilance Task (PVT) performance declined on early, high-workload, and late schedules compared to baseline.

Conclusions:

• The combined methods are practical and effective for assessing fatigue and performance influences in operational settings.
• This approach provides valuable insights into the effects of sleep loss and circadian disruption on pilot performance.