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Published on: October 7, 2015
Temperature of ingested water and thermoregulation during moderate-intensity exercise
G S Wimer1, D R Lamb, W M Sherman
1Division of Health and Physical Education, Armstrong Atlantic State University, Savannah, GA 31419-1997, USA.
Summary
Ingesting cold or cool water during exercise significantly reduces core body temperature rise compared to warm water. Water intake, regardless of temperature, lowers heat storage during exercise.
Area of Science:
- Exercise Physiology
- Environmental Physiology
- Thermoregulation
Background:
- The impact of ingested water temperature on core body temperature during exercise remains incompletely understood.
- Understanding thermoregulation during exercise is crucial for performance and safety.
Purpose of the Study:
- To investigate the effect of ingested water temperature on core body temperature (Tco) during prolonged exercise.
- To compare the physiological responses to ingesting cold, cool, and warm water during cycling exercise.
Main Methods:
- Seven trained male subjects performed 2 hours of recumbent cycling at 51% VO2peak in a temperate environment (26°C).
- Subjects ingested no fluid, cold (0.5°C), cool (19°C), or warm (38°C) water during the second hour.
- A trial at a higher ambient temperature (31°C) with cold water ingestion was also performed.
Main Results:
- Cold water ingestion attenuated core body temperature and forearm blood flow increases compared to warm water.
- Cold and cool water reduced whole-body sweat rate compared to warm water.
- All fluid ingestion trials reduced core body temperature and heat storage compared to no fluid intake.
Conclusions:
- Ingesting cold or cool water effectively attenuates core body temperature rise during exercise compared to warm water.
- Water consumption, irrespective of temperature, aids in reducing heat storage during prolonged exercise.
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