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Related Experiment Videos

Heat loss from the human head during exercise.

W Rasch1, P Samson, J Cote

  • 1Department of Physiology, Laval University, Quebec, Canada.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1991
PubMed
Summary
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The human head can dissipate more heat than the brain generates, suggesting it acts as a heat sink for selective brain cooling. This heat loss is crucial for maintaining stable brain temperature during hyperthermia.

Area of Science:

  • Human Physiology
  • Thermoregulation
  • Exercise Physiology

Background:

  • The head's role in thermoregulation is critical for maintaining brain temperature.
  • Selective brain cooling mechanisms are essential during heat stress.

Purpose of the Study:

  • To investigate if the head functions as a heat sink for selective brain cooling.
  • To quantify heat loss from the head surface and expired air under varying ambient temperatures and exercise.

Main Methods:

  • Measured evaporative and convective heat loss from head skin and expired air.
  • Utilized an open-circuit method in four male subjects.
  • Subjects were tested at rest and during incremental exercise at 5, 15, and 25 degrees C ambient temperature.

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Main Results:

  • Head heat loss exceeded respiratory heat loss across conditions.
  • Heat loss from the head and respiratory tract correlated with increasing esophageal temperature at 15 and 25 degrees C.
  • At 5 degrees C, heat loss from the head was greater than arterial heat supply to the brain plus brain metabolic heat production.

Conclusions:

  • The head can function as a significant heat sink, facilitating selective brain cooling.
  • Head heat loss is a key factor in preventing brain hyperthermia during exercise.
  • Understanding head thermoregulation is vital for managing heat stress in various environments.