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Fluid intake, hydration, work physiology of wildfire fighters working in the heat over consecutive days

Raines, Jenni, Snow, Rodney, Nichols, David and Aisbett, Brad 2015, Fluid intake, hydration, work physiology of wildfire fighters working in the heat over consecutive days, Annals of occupational hygiene, vol. 59, no. 5, pp. 554-565, doi: 10.1093/annhyg/meu113.

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Title Fluid intake, hydration, work physiology of wildfire fighters working in the heat over consecutive days
Author(s) Raines, Jenni
Snow, RodneyORCID iD for Snow, Rodney orcid.org/0000-0002-4796-6916
Nichols, David
Aisbett, BradORCID iD for Aisbett, Brad orcid.org/0000-0001-8077-0272
Journal name Annals of occupational hygiene
Volume number 59
Issue number 5
Start page 554
End page 565
Total pages 12
Publisher Oxford Univeristy Press
Place of publication Oxford, Eng.
Publication date 2015-06
ISSN 1475-3162
Keyword(s) activity
firefighters
thermoregulation.
Science & Technology
Life Sciences & Biomedicine
Public, Environmental & Occupational Health
Toxicology
thermoregulation
WILDLAND FIREFIGHTERS
EXERCISE PERFORMANCE
ENERGY-EXPENDITURE
PLASMA OSMOLALITY
DRINKING BEHAVIOR
PHYSICAL-ACTIVITY
DEHYDRATION
SUPPRESSION
INGESTION
STRESS
Summary PURPOSE: (i) To evaluate firefighters' pre- and post-shift hydration status across two shifts of wildfire suppression work in hot weather conditions. (ii) To document firefighters' fluid intake during and between two shifts of wildfire suppression work. (iii) To compare firefighters' heart rate, activity, rating of perceived exertion (RPE), and core temperature across the two consecutive shifts of wildfire suppression work. METHOD: Across two consecutive days, 12 salaried firefighters' hydration status was measured immediately pre- and post-shift. Hydration status was also measured 2h post-shift. RPE was also measured immediately post-shift on each day. Work activity, heart rate, and core temperature were logged continuously during each shift. Ten firefighters also manually recorded their food and fluid intake before, during, and after both fireground shifts. RESULTS: Firefighters were not euhydrated at all measurement points on Day one (292±1 mOsm l(-1)) and euhydrated across these same time points on Day two (289±0.5 mOsm l(-1)). Fluid consumption following firefighters' shift on Day one (1792±1134ml) trended (P = 0.08) higher than Day two (1108±1142ml). Daily total fluid intake was not different (P = 0.27), averaging 6443±1941ml across both days. Core temperature and the time spent ≥ 70%HRmax were both elevated on Day one (when firefighters were not euhydrated). Firefighters' work activity profile was not different between both days of work. CONCLUSION: There was no difference in firefighters' pre- to post-shift hydration within each shift, suggesting ad libitum drinking was at least sufficient to maintain pre-shift hydration status, even in hot conditions. Firefighters' relative hypohydration on Day one (despite a slightly lower ambient temperature) may have been associated with elevations in core temperature, more time in the higher heart rate zones, and 'post-shift' RPE.
Language eng
DOI 10.1093/annhyg/meu113
Field of Research 119999 Medical and Health Sciences 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, Oxford Univeristy Press
Persistent URL http://hdl.handle.net/10536/DRO/DU:30077170

Document type: Journal Article
Collection: Centre for Physical Activity and Nutrition Research
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