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Exercise thermoregulation after prolonged wakefulness.

M A Kolka1, L A Stephenson

  • 1US Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760-5007.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1988
PubMed
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Sleep deprivation impairs the body's ability to regulate skin blood flow and sweating during exercise. This reduced thermoregulation response is due to both central and local factors affecting blood flow control.

Area of Science:

  • Exercise Physiology
  • Thermoregulation
  • Sleep Deprivation Research

Background:

  • Maintaining stable body temperature during exercise is crucial for performance and safety.
  • Sleep deprivation is known to affect various physiological functions, but its impact on thermoregulation during exercise requires further investigation.

Purpose of the Study:

  • To investigate the effects of 33 hours of wakefulness on the control of forearm cutaneous blood flow and sweating during exercise.
  • To determine if sleep loss alters the core temperature thresholds or sensitivities for vasodilation and sweating responses.

Main Methods:

  • Three men and three women exercised at 60% peak oxygen consumption in a hot environment (35°C, 1.0 kPa).
  • Esophageal temperature, mean skin temperature, arm sweating, and forearm blood flow were continuously measured.

Related Experiment Videos

  • Forearm blood flow was assessed using venous occlusion plethysmography.

    • Main Results:

    • Sleep loss did not significantly change esophageal temperature during steady-state exercise.
    • The sensitivity of forearm blood flow to esophageal temperature was reduced by 30% after 33 hours of wakefulness.
    • A slight decrease in the core temperature threshold for vasodilation was observed, while sweating onset and sensitivity remained largely unaffected.

    Conclusions:

    • Thirty-three hours of wakefulness impairs reflex cutaneous vasodilation during exercise, suggesting reduced blood flow to the skin for heat dissipation.
    • Both central (core temperature threshold) and local factors appear to contribute to the blunted vasodilatory response following sleep deprivation.
    • While sweating response was not significantly altered, the reduced blood flow suggests an impaired overall thermoregulatory capacity.