Indifference temperature

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As indifference temperature refers to the outside temperature at which a minimum of regulatory mechanisms is necessary to the body temperature to keep stable.

Depending on climatic conditions, ethnic and permanent adaptation and other factors, the indifference temperature in humans is around 27 to 31 ° C. In this temperature range, the temperature sensation is neutral, ie adults are neither cold nor warm at this temperature . It is higher in infants than in adults: It only starts here at around 32 ° C, which is why a heat lamp above the changing table is useful in this case . A warming or cooling of the skin in this area therefore only temporarily leads to warm or cold sensations, until after a few minutes a complete adaptation to the new skin temperature is achieved, i.e. it is no longer perceived as warmer or colder.

As a result of the necessary muscular work of the circulatory system , breathing and digestion and the resulting heat, however, heat is still given off from the body to the environment at the indifference temperature.

In water, the indifference temperature is around 34.5 to 35.5 ° C (or 34 to 35 ° C) because of the much higher thermal conductivity of water.

The air temperature when determining the basal metabolic rate is set to the indifference temperature .

literature

  • Max Schneider: Introduction to human physiology. Springer-Verlag, Heidelberg / Wiesbaden 1971, ISBN 3-540-05243-7 .
  • Klaus D. Mörike, Eberhard Betz, Walter Mergenthaler: Human Biology. Source & Meyer Verlag, Heidelberg / Wiesbaden 1991, ISBN 3-494-01196-6 .
  • Niels Birbaumer , RF Schmidt: Biological Psychology. Jumper. Berlin 2005, ISBN 3-540-25460-9 .

Individual evidence

  1. ^ F. Lang, P. Lang: Basic knowledge of physiology. 2nd Edition. Springer-Verlag, Heidelberg 2007, ISBN 978-3-540-71401-9 , p. 189.
  2. ↑ a b Human Physiology in Extreme Environments (Hanns-Christian Gunga, Elsevier , p. 175, accessed on May 18, 2016)
  3. ↑ KS Park, JK Choi, YS Park: Cardiovascular regulation during water immersion. In: Applied Human Science. Volume 18, Number 6, November 1999, pp. 233-241, PMID 10675972 .