The impact of sleep restriction while performing simulated physical firefighting work on cortisol and heart rate responses

Wolkow, Alexander, Aisbett, Brad, Reynolds, John, Ferguson, Sally A. and Main, Luana C. 2016, The impact of sleep restriction while performing simulated physical firefighting work on cortisol and heart rate responses, International archives of occupational and environmental health, vol. 89, no. 3, pp. 461-475.

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Title The impact of sleep restriction while performing simulated physical firefighting work on cortisol and heart rate responses
Author(s) Wolkow, Alexander
Aisbett, BradORCID iD for Aisbett, Brad
Reynolds, John
Ferguson, Sally A.
Main, Luana C.ORCID iD for Main, Luana C.
Journal name International archives of occupational and environmental health
Volume number 89
Issue number 3
Start page 461
End page 475
Total pages 15
Publisher Springer
Place of publication Berlin, Germany
Publication date 2016-04
ISSN 1432-1246
Keyword(s) Cortisol
Heart rate
Physical work
Sleep restriction
Summary PURPOSE: Physical work and sleep restriction are two stressors faced by firefighters, yet the combined impact these demands have on firefighters' acute stress responses is poorly understood. The purpose of the present study was to assess the effect firefighting work and sleep restriction have on firefighters' acute cortisol and heart rate (HR) responses during a simulated 3-day and 2-night fire-ground deployment. METHODS: Firefighters completed multiple days of simulated physical work separated by either an 8-h (control condition; n = 18) or 4-h sleep opportunity (sleep restriction condition; n = 17). Salivary cortisol was sampled every 2 h, and HR was measured continuously each day. RESULTS: On day 2 and day 3 of the deployment, the sleep restriction condition exhibited a significantly higher daily area under the curve cortisol level and an elevated cortisol profile in the afternoon and evening when compared with the control condition. Firefighters' HR decreased across the simulation, but there were no significant differences found between conditions. CONCLUSION: Findings highlight the protective role an 8-h sleep opportunity between shifts of firefighting work has on preserving normal cortisol levels when compared to a 4-h sleep opportunity which resulted in elevated afternoon and evening cortisol. Given the adverse health outcomes associated with chronically high cortisol, especially later in the day, future research should examine how prolonged exposure to firefighting work (including restricted sleep) affects firefighters' cortisol levels long term. Furthermore, monitoring cortisol levels post-deployment will determine the minimum recovery time firefighters need to safely return to the fire-ground.
Language eng
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Springer
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Document type: Journal Article
Collections: Faculty of Health
Institute for Physical Activity and Nutrition
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