Human Physiology

, Volume 31, Issue 2, pp 181–187 | Cite as

Parameters of thermal homeostasis and psychophysiological monitoring in the evaluation of the phasic structure of adaptation during 240-day isolation

  • I. M. Larina
  • T. I. Smirnova
  • N. G. Lacota
  • A. F. Bystritskaya


Psychophysiological (PPM) and thermal homeostasis monitoring independently detected four phases of human (N = 4) adaptation to prolonged isolation in a simulator of the Mir station. The results, which reflected adaptive reactions in different functional systems of the body, were compared using identical methods of analysis of variance and correlation and factor analyses with two independent versions of the division of 240-day isolation into phases. In spite of the manifestly individual character of temperature (T) responses, the significance of phasic differences of eight thermal homeostasis (THS) parameters was high, especially in the case of the combined effect of the factors phase and individuality on rectal T and the chest-foot T gradient at the level of basal metabolism. The similarity of patterns of changes in PPM and THS parameters was significant, confirming the phasic character of responses in the thermoregulation system and the working hypothesis that adaptive processes in the human body have their own biological rhythms with a period (ca. 60 days) longer than that of circadian and shorter than that of seasonal rhythms. The dynamics of rectal T, weighted mean body T, and the chest-foot longitudinal gradient was most similar to that of PPM indices. A direct correlation was found between (a) average intraday concentration of cortisol in saliva, on the one hand, and deep body T and longitudinal T gradient (r = 0.52; P <0.05), on the other, and (b) heart rate and weighted mean body T at the level of basal metabolism. It is recommended to supplement four PPM parameters by one or two informative THS parameters that are convenient for direct recording. The parameter of choice is the chest-foot T gradient, much studied under normal and test conditions. It takes a subject only 1–2 min to obtain results and enter them in the PPM data bank file when this gradient is used.


Cortisol Factor Phase Basal Metabolism Biological Rhythm Longitudinal Gradient 
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Copyright information

© MAIK “Nauka/Interperiodica” 2005

Authors and Affiliations

  • I. M. Larina
    • 1
  • T. I. Smirnova
    • 1
  • N. G. Lacota
    • 1
  • A. F. Bystritskaya
    • 1
  1. 1.Institute of Biomedical ProblemsRussian Academy of SciencesMoscowRussia

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