Human thermohomeostasis onboard "Mir" and in simulated microgravity studies

Acta Astronaut. Aug-Nov 2001;49(3-10):137-43. doi: 10.1016/s0094-5765(01)00091-1.

Abstract

Significant changes of thermogomeostatic parameters was obtained by thermotopometric method using the techniques simulate of microgravity effects: bed rest, pressurized isolation, suit immersion (SI). However, each of ground models made rectal temperature (T) trend downward. The autothermometric study (24 and 12 sessions, 2-13th and 6-174th flight days) was carried out onboard "Mir" by two flight engineers who had preliminary tested at SI (1-2 days). Studies of German investigators onboard "Mir" confirmed: rectal T must be higher in space flight as compared to the normal environment (n=4). Comparative studies suggest that microgravity is a key factor for the human body surface T raise and abolishment of the external/internal T-gradient. T-homeostasis was not really changing during missions and could be regarded as acute effect of microgravity. After delineation of changes in body surface T--by Carnot's thermodynamic law--rectal T raise should have been anticipated. Facts pointing to the excess entropy of human body must not be passed over.

Publication types

  • Comparative Study

MeSH terms

  • Adaptation, Physiological / physiology*
  • Atmospheric Pressure
  • Bed Rest
  • Body Temperature Regulation / physiology*
  • Female
  • Humans
  • Immersion
  • Male
  • Social Isolation
  • Space Flight*
  • Space Suits
  • Weightlessness Simulation*
  • Weightlessness*