Fatigue in wildland firefighting: relationships between sleep, shift characteristics, and cognitive function
J. Wallace-Webb A * , C. Coehoorn B , S. Purewal A , G. Thomas A , K. Muirhead A , J. Angus A and L. Stuart-Hill AA
B
Abstract
Wildland firefighting requires exposure to long shifts and poor sleep, which may pose a risk to worker safety due to impaired cognitive function.
We investigated the associations between sleep, shift characteristics, and cognitive function in wildland firefighters.
We conducted a within-subject observational study with 25 wildland firefighters from the British Columbia Wildfire Service, Canada. Data were collected remotely during the 2021 and 2022 fire seasons. Wrist-worn actigraphy and the psychomotor vigilance task served as objective, mobile measures of sleep and cognitive function, respectively. Web-based surveys were used to collect shift information and subjective cognitive function. Linear mixed effects modeling was used to control for inter-individual differences and explore the influence of participant-factors.
Average sleep duration on fire suppression days was 6.7 h (s.d. 66 min), while average shift duration was 13.8 h (s.d. 108 min). Poor sleep and longer shift durations were both associated with reduced cognitive function across all metrics (P < 0.01; P < 0.001).
Firefighters are often exposed to poor sleep and long shifts, which are both associated with impaired cognitive function.
Our results highlight the need for fire agencies to consider fatigue-related cognitive impairment as an important factor for worker health and safety.
Keywords: cognitive function, extended shifts, fatigue management, occupational health and safety, psychomotor vigilance task, shift work, sleep deprivation, wildland firefighting.
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