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Simulated Firefighting Task Performance and Physiology Under Very Hot Conditions.

Brianna Larsen¹, Rod Snow², Michael Williams-Bell³

¹School of Exercise and Nutrition Sciences, Faculty of Health, Deakin University Melbourne, VIC, Australia.

Frontiers in Physiology

|December 1, 2015

Summary

Very hot conditions (45°C) significantly impair firefighting performance and increase physiological strain. Fire agencies must address thermal stress and reduced productivity in extreme heat for firefighter safety.

Keywords:

exertion heat hydration thermal stress work output

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Area of Science:

Occupational Health
Environmental Physiology
Firefighter Performance Science

Background:

Firefighting involves strenuous manual tasks under demanding environmental conditions.
Extreme heat poses significant risks to firefighter health and operational effectiveness.

Purpose of the Study:

To evaluate the impact of very hot (45°C) versus temperate (18°C) conditions on simulated firefighting task performance.
To assess physiological responses and perceived exertion during manual handling in extreme heat.

Main Methods:

Ten male firefighters completed a 3-hour simulated firefighting protocol in both 18°C and 45°C environments.
Work performance was measured by debris cleared during raking; physiological data (core temperature, heart rate) and subjective ratings (RPE, thermal sensation) were collected.

Main Results:

Work performance decreased by 19% in very hot conditions, with higher core/skin temperatures and heart rates.
Increased water consumption and sweat losses were observed in the heat, though hydration was maintained.
Perceived exertion and thermal sensation scores were significantly elevated in the 45°C environment.

Conclusions:

Very hot conditions lead to reduced work output and increased physiological strain for firefighters, despite fluid intake.
Fire agencies need to implement strategies to mitigate heat stress and manage productivity losses in extreme temperatures.
Prioritizing firefighter health and safety is crucial during operations in very hot environments.