Relationships between inflammatory cytokine and cortisol responses in firefighters exposed to simulated wildfire suppression work and sleep restriction

Wolkow, Alexander, Aisbett, Brad, Reynolds, John, Ferguson, Sally A. and Main, Luana C. 2015, Relationships between inflammatory cytokine and cortisol responses in firefighters exposed to simulated wildfire suppression work and sleep restriction, Physiological reports, vol. 3, no. 11, Article Number : e12604, pp. 1-14, doi: 10.14814/phy2.12604.

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Title Relationships between inflammatory cytokine and cortisol responses in firefighters exposed to simulated wildfire suppression work and sleep restriction
Author(s) Wolkow, Alexander
Aisbett, BradORCID iD for Aisbett, Brad orcid.org/0000-0001-8077-0272
Reynolds, John
Ferguson, Sally A.
Main, Luana C.ORCID iD for Main, Luana C. orcid.org/0000-0002-9576-9466
Journal name Physiological reports
Volume number 3
Issue number 11
Season Article Number : e12604
Start page 1
End page 14
Total pages 14
Publisher Wiley
Place of publication London, Eng.
Publication date 2015-11
ISSN 2051-817X
Keyword(s) Cortisol
cytokines
firefighters
physical work
sleep restriction
Summary The interplay between inflammatory and cortisol responses modulates an appropriate response to a stressor. Exposure to severe stressors, however, may alter the actions and relationships of these responses and contribute to negative health outcomes. Physical work and sleep restriction are two stressors faced by wildland firefighters, yet their influence on the relationship between inflammatory and cortisol responses is unknown. The aim of the present study was to quantify the relationship between the cytokine and cortisol responses to sleep restriction while performing simulated physical wildfire suppression work. Firefighters completed 3 days of simulated physical firefighting work separated by either an 8-h (Control condition; n = 18) or 4-h sleep (Sleep restriction condition; n = 17) opportunity on each of the two nights. Salivary cortisol and inflammatory cytokines (IL-6, IL-8, IL-1β, TNF-α, IL-4, and IL-10) were measured throughout each day. An increase in morning IL-6 was related to a rise (6.2%, P = 0.043) in evening cortisol among firefighters in the sleep restriction condition. Higher morning IL-6 levels were related to increased (5.3%, P = 0.048) daily cortisol levels, but this relationship was not different between conditions. Less pronounced relationships were demonstrated between TNF-α, IL-10, IL-4, and cortisol independent of the sleep opportunity, but relationships did not persist after adjusting for demographic factors and other cytokines. These findings quantify the relationship between cytokine and cortisol responses among wildland firefighters exposed to simulated occupational stressors. Potential disturbances to the IL-6 and cortisol relationship among sleep-restricted firefighters' supports further investigations into the negative health effects related to possible imbalances between these systems.
Language eng
DOI 10.14814/phy2.12604
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 ©2015, Wiley
Persistent URL http://hdl.handle.net/10536/DRO/DU:30080485

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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