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Tympanic temperatures during hemiface cooling.

M Cabanac1, M Germain, H Brinnel

  • 1Université Claude Bernard, Faculté de Médecine Lyon-Sud, France.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1987
PubMed
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Selective brain cooling occurs during hyperthermia in men. Cooling one side of the face reduced brain temperature, indicating vascular mechanisms play a key role in thermoregulation.

Area of Science:

  • Physiology
  • Thermoregulation

Background:

  • Maintaining stable core body temperature is crucial for physiological function.
  • The brain's temperature regulation is complex and influenced by various factors.

Purpose of the Study:

  • To investigate the effects of unilateral facial cooling on brain temperature during induced hyperthermia and hypothermia.
  • To explore the mechanisms of selective brain cooling.

Main Methods:

  • Adult men underwent induced hyperthermia (warm water immersion) and hypothermia.
  • One hemiface was cooled using water mist and fanning, while the other side was insulated.
  • Tympanic membrane temperature (Tty) and oesophageal temperature were monitored.

Main Results:

Related Experiment Videos

  • During hypothermia, right facial cooling lowered right Tty but raised left Tty.
  • During hyperthermia, right facial cooling lowered both right and left Tty, with left Tty approaching core temperature.
  • Left Tty cooling during hyperthermia suggests vascular redistribution, not just conduction.

    • Conclusions:

    • Selective brain cooling occurs during hyperthermia.
    • Forced vascular convection is the primary mechanism for selective brain cooling.
    • Conductive cooling also contributes to brain temperature regulation.