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Workshift Changes in Hydration Status During Wildfire Suppression.

Alejandro M Rosales1, Patrick S Dodds, Joseph A Sol

  • 1Montana Center for Work Physiology and Exercise Metabolism, The University of Montana, Missoula, Montana (Mr Rosales, Mr Dodds, Mr Marks, and Dr Ruby); National Technology and Development Program, United States Department of Agriculture Forest Service, Missoula, Montana (Mr Sol and Dr Domitrovich).

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|June 6, 2021
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Summary
This summary is machine-generated.

Wildland firefighters (WLFFs) maintained hydration and electrolyte balance during long workshifts through adequate fluid and food intake. This study shows WLFFs can manage their hydration status effectively during demanding conditions.

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Area of Science:

  • Environmental Health
  • Occupational Physiology
  • Wildland Firefighting Research

Background:

  • Wildland firefighters (WLFFs) face extreme physiological demands during prolonged workshifts.
  • Maintaining optimal hydration and electrolyte balance is critical for WLFF performance and health.
  • Previous research has highlighted the risks of dehydration and heat illness in this population.

Purpose of the Study:

  • To document the hydration status of WLFFs during a typical workshift.
  • To assess fluid consumption and key physiological markers in WLFFs.
  • To determine if WLFFs maintain euhydration and electrolyte balance during strenuous activity.

Main Methods:

  • Real-time monitoring of urine metrics and fluid consumption in 71 WLFFs over a 13.7-hour shift.
  • Collection of body weight and blood samples from a subset of 25 WLFFs.
  • Statistical analysis using two-tailed dependent t tests to assess significance (P < 0.05).

Main Results:

  • Body weight showed a non-significant decrease of 0.3%.
  • Fluid intake averaged 6.2 L (with food) or 5.0 L (without food).
  • Urine metrics (frequency, volume, specific gravity) and serum electrolytes (sodium, potassium) remained stable; however, serum chloride and blood glucose significantly decreased post-shift.

Conclusions:

  • WLFFs' fluid and food intake during workshifts is sufficient to maintain euhydration.
  • Despite decreased serum chloride and glucose, overall electrolyte status is maintained.
  • Findings suggest effective self-management of hydration and electrolytes by WLFFs during demanding conditions.