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Short-Term, Low-Volume Training Improves Heat Acclimatization in an Operational Context
Keyne Charlot1, Pierre-Emmanuel Tardo-Dino1,2, Jean-François Buchet3
1Département Environnements Opérationnels, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, Institut de Recherche Biomédicale des ArméesBretigny-Sur-Orge, France.
Frontiers in Physiology
|July 4, 2017
Summary
Short, daily exercise sessions accelerated heat acclimatization in soldiers deployed to hot climates. This 5-day moderate-intensity training program improved physiological responses and reduced discomfort, enhancing operational readiness in extreme heat.
Area of Science:
- Environmental Physiology
- Exercise Science
- Occupational Health
Background:
- Personnel in hot climates face physiological strain and reduced operability due to heat.
- Physical activity during heat acclimatization enhances the process, but its efficiency in operational settings is unclear.
- High volumes of work-related physical activity characterize operative contexts, potentially impacting acclimatization strategies.
Purpose of the Study:
- To determine if short, moderate-intensity aerobic training sessions are efficient for heat acclimatization in an operative context.
- To assess the impact of a 5-day training program on physiological and subjective heat strain in soldiers.
Main Methods:
- Thirty French soldiers (Training group, T) performed a 5-day progressive aerobic training program (3-5 sets of 8-min running at 50% VO2max) in the UAE (~40°C, 12% RH).
- A control group (No Training, NT) continued usual outdoor military activities (~6 h/day).
- A field heat stress test (HST) was conducted before and after the acclimatization period to measure physiological and subjective changes.
Main Results:
- Both groups showed decreased rectal temperature, heart rate (HR), thermal discomfort, rates of perceived exertion (RPE), and sweat osmolality post-acclimatization.
- The Training group exhibited significantly greater reductions in HR, resting and exercise thermal discomfort, and RPE compared to the No Training group.
- These findings indicate that the short training intervention accelerated heat acclimatization-induced changes within 5 days.
Conclusions:
- Adding short (<60 min), daily, moderate-intensity training sessions during a professional mission in a hot, dry environment significantly accelerates heat acclimatization.
- This training approach enhances physiological and subjective adaptations at rest and during exercise in just 5 days.
- The findings support the use of brief, targeted exercise interventions to improve heat tolerance and maintain operational effectiveness in hot climates.
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