Simulated firefighting task performance and physiology under very hot conditions

Larsen, Brianna, Snow, Rod, Williams-Bell, Michael and Aisbett, Brad 2015, Simulated firefighting task performance and physiology under very hot conditions, Frontiers in physiology, vol. 6, Article Number : 322, pp. 1-9, doi: 10.3389/fphys.2015.00322.

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Title Simulated firefighting task performance and physiology under very hot conditions
Author(s) Larsen, Brianna
Snow, RodORCID iD for Snow, Rod
Williams-Bell, Michael
Aisbett, BradORCID iD for Aisbett, Brad
Journal name Frontiers in physiology
Volume number 6
Season Article Number : 322
Start page 1
End page 9
Total pages 9
Publisher Frontiers Research Foundation
Place of publication Lausanne, Switzerland
Publication date 2015-11
ISSN 1664-042X
Keyword(s) exertion
thermal stress
work output
Science & Technology
Life Sciences & Biomedicine
Summary PURPOSE: To assess the impact of very hot (45°C) conditions on the performance of, and physiological responses to, a simulated firefighting manual-handling task compared to the same work in a temperate environment (18°C). METHODS: Ten male volunteer firefighters performed a 3-h protocol in both 18°C (CON) and 45°C (VH). Participants intermittently performed 12 × 1-min bouts of raking, 6 × 8-min bouts of low-intensity stepping, and 6 × 20-min rest periods. The area cleared during the raking task determined work performance. Core temperature, skin temperature, and heart rate were measured continuously. Participants also periodically rated their perceived exertion (RPE) and thermal sensation. Firefighters consumed water ad libitum. Urine specific gravity (USG) and changes in body mass determined hydration status. RESULTS: Firefighters raked 19% less debris during the VH condition. Core and skin temperature were 0.99 ± 0.20 and 5.45 ± 0.53°C higher, respectively, during the VH trial, and heart rate was 14-36 beats.min(-1) higher in the VH trial. Firefighters consumed 2950 ± 1034 mL of water in the VH condition, compared to 1290 ± 525 in the CON trial. Sweat losses were higher in the VH (1886 ± 474 mL) compared to the CON trial (462 ± 392 mL), though both groups were hydrated upon protocol completion (USG < 1.020). Participants' average RPE was higher in the VH (15.6 ± 0.9) compared to the CON trial (12.6 ± 0.9). Similarly, the firefighers' thermal sensation scores were significantly higher in the VH (6.4 ± 0.5) compared to the CON trial (4.4 ± 0.4). CONCLUSIONS: Despite the decreased work output and aggressive fluid replacement observed in the VH trial, firefighters' experienced increases in thermal stress, and exertion. Fire agencies should prioritize the health and safety of fire personnel in very hot temperatures, and consider the impact of reduced productivity on fire suppression efforts.
Language eng
DOI 10.3389/fphys.2015.00322
Field of Research 111705 Environmental and Occupational Health and Safety
Socio Economic Objective 920407 Health Protection and/or Disaster Response
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Frontiers Research Foundation
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