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Related Experiment Video

Updated: May 23, 2026

A Detailed Protocol for Perspiration Monitoring Using a Novel, Small, Wireless Device

A Detailed Protocol for Perspiration Monitoring Using a Novel, Small, Wireless Device

Published on: November 24, 2016

Quantifying dehydration in the fire service using field methods and novel devices.

Gavin P Horn¹, Jacob DeBlois, Inga Shalmyeva

¹Illinois Fire Service Institute, University of Illinois at Urbana-Champaign, IL 61820, USA. ghorn@fsi.illinois.edu

Prehospital Emergency Care

|March 27, 2012

Summary

Many firefighters arrive dehydrated, risking heat injuries. Salivary osmolality effectively tracks hydration changes during firefighting training, offering a practical field measurement tool.

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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

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Published on: August 8, 2019

Area of Science:

Occupational Health
Sports Science
Physiology

Background:

Firefighters face demanding physical activity, increasing dehydration risk.
Hydration status is critical for firefighter performance and safety.
Current hydration monitoring methods may lack field applicability.

Purpose of the Study:

To measure firefighter hydration status before and after training.
To document hydration changes during prolonged firefighting simulation.
To evaluate the utility of salivary measurements for assessing hydration in field settings.

Main Methods:

Body mass, urine, and saliva samples were collected before and after ~3 hours of firefighting training.
Initial hydration was assessed using urinary and salivary measures.
Changes in body mass and total body water were correlated with hydration measure changes.

Main Results:

A significant percentage of firefighters were dehydrated upon arrival at training.
Firefighting operations led to substantial body mass loss and dehydration.
Salivary osmolality showed a stronger correlation with hydration changes than urinary measures.

Conclusions:

Pre-training dehydration poses risks of heat injury and compromised performance for firefighters.
Firefighters experience dehydration during training, even with fluid availability.
Salivary osmolality presents a viable field tool for monitoring hydration status in firefighters.