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Related Experiment Videos

Glycerol hyperhydration: physiological responses during cold-air exposure.

Catherine O'Brien1, Beau J Freund, Andrew J Young

  • 1Thermal Physiology and Medicine Division, US Army Research Institute of Environmental Medicine, Natick, MA 01760-5007, USA. kate.obrien@us.army.mil

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 9, 2005
PubMed
Summary

Glycerol ingestion effectively enhances hydration during cold air exposure (CAE), improving fluid retention compared to water alone. This strategy helps maintain hydration levels, crucial for physical performance in cold environments.

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Area of Science:

  • Environmental Physiology
  • Sports Science
  • Human Performance

Background:

  • Cold air exposure (CAE) can lead to hypohydration, negatively impacting physical performance.
  • Glycerol ingestion (GI) is known to promote hyperhydration in warm conditions, but its efficacy in cold environments is unclear.
  • Cold water immersion causes significant fluid loss, raising questions about glycerol's effectiveness during cold air exposure.

Purpose of the Study:

  • To investigate the physiological effects of glycerol ingestion on hydration status during cold air exposure.
  • To compare fluid retention and physiological responses between glycerol ingestion, water ingestion, and no fluid intake during CAE.
  • To determine if glycerol can serve as an effective hyperhydrating agent in a cold environment.

Main Methods:

Related Experiment Videos

  • Seven healthy men participated in three double-blind, counterbalanced trials involving water ingestion (WI), glycerol ingestion (GI), and no fluid.
  • Subjects underwent 4 hours of cold air exposure (15°C, 30% relative humidity) after ingesting fluids 30 minutes prior.
  • Physiological responses including thermoregulation, cardiovascular, renal, vascular fluid, and hormonal markers were monitored.

Main Results:

  • Thermoregulatory responses to cold were similar across all trials.
  • Urine flow rates were significantly lower with GI compared to WI.
  • Fluid retention was significantly greater with GI (34%) than with WI (18%) at the end of the cold air exposure period.

Conclusions:

  • Glycerol ingestion is an effective hyperhydrating agent during cold air exposure.
  • GI leads to greater fluid retention compared to water ingestion alone in cold environments.
  • Maintaining hydration with glycerol may be beneficial for physical performance during CAE.