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Related Experiment Videos

Effect of fluid intake on renal function during exercise in the cold.

E J Dann1, S Gillis, R Burstein

  • 1Heller Institute of Medical Research, Sheba Medical Center, Tel-Hashomer, Israel.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1990
PubMed
Summary

To prevent voluntary dehydration during cold-weather exercise, maintain a fluid intake of 150 ml per hour. This ensures adequate hydration and urinary flow, crucial for well-trained individuals at altitude.

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Area of Science:

  • Exercise Physiology
  • Environmental Medicine
  • Sports Science

Background:

  • Maintaining hydration is critical during prolonged exercise, especially in challenging environments.
  • Voluntary dehydration can occur during endurance activities if fluid intake is not regulated.
  • Cold ambient temperatures and altitude can influence fluid balance and physiological responses during exertion.

Purpose of the Study:

  • To investigate the effects of a prescribed drinking regimen versus ad libitum (self-selected) fluid intake on hydration status.
  • To assess physiological markers of hydration in healthy volunteers during sustained marching at altitude in the cold.
  • To determine optimal fluid intake strategies for preventing dehydration during cold-weather endurance exercise.

Main Methods:

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  • 21 healthy, well-trained volunteers completed a 4.5-hour march at 1,700m altitude and 0°C.
  • Group I (n=13) consumed 250 ml fluid every 30 minutes; Group II (n=8) drank water ad libitum.
  • Collected data included fluid intake, serum markers (urea, osmolality), hemoglobin, urine output, and clearance rates.

    • Main Results:

    • Prescribed fluid intake (Group I) was significantly higher than ad libitum (Group II).
    • Group I showed decreased serum urea and osmolality, unlike Group II, indicating better hydration.
    • Despite similar hemoconcentration in both groups, Group I maintained higher urine volume and lower urinary osmolality.

    Conclusions:

    • Ad libitum drinking leads to significant "voluntary dehydration" in cold, high-altitude conditions.
    • A prescribed fluid intake of 150 ml/hour is recommended to maintain urinary flow and hydration.
    • Consistent fluid consumption is essential for optimal physiological function during prolonged cold-weather exercise.