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Intermittent heat exposure and thirst in rats
Christopher C Barney1, David M Kuhrt2
1Department of Biology, Hope College, Holland, Michigan barney@hope.edu.
Physiological Reports
|April 21, 2016
Summary
Water access during heat exposure is crucial. Providing water improves rehydration and alters thirst responses, while withholding water impairs rehydration and drinking behaviors during heat stress.
Area of Science:
- Environmental Physiology
- Thermoregulation
- Behavioral Neuroscience
Background:
- Global warming increases heat wave frequency, necessitating understanding of water intake regulation during heat exposure.
- Water intake is vital for cardiovascular function and evaporative cooling, yet its control during intermittent heat is unclear.
Purpose of the Study:
- To investigate the impact of water availability on water intake and rehydration during intermittent heat exposure.
- To examine how thirst mechanisms (intracellular and extracellular) are affected by heat and water access.
Main Methods:
- Male Sprague-Dawley rats were exposed to 37.5°C for 4 hours daily for 7 days.
- Experimental groups included rats with and without water access during heat exposure.
- Thirst responses were assessed via peripheral administration of angiotensin II or hypertonic saline.
Main Results:
- Intermittent heat exposure reduced evaporative water loss and post-heat water intake over time.
- Rats denied water showed reduced rehydration, while those with water access increased intake and rehydrated better.
- Water access during heat normalized responses to thirst challenges; lack of water altered responses to both intracellular and extracellular thirst stimuli.
Conclusions:
- Providing water during intermittent heat exposure significantly improves rehydration and modulates thirst responses.
- Heat exposure without water access disrupts normal drinking behaviors and alters physiological responses to thirst challenges.
