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Study of Temperature Homeostasis in Real and Simulated Weightlessness

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Abstract

The analysis of the temperature (T) reaction of the body of healthy humans was carried out using the results of investigations with the thermometry technique under antiorthostatic hypokinesia (ANOH) (38 males in the studies of 14- to 49-day duration, eight females, 120 days), isolation in a regenerated gas environment (six males, 90 to 135 days), suit immersion (46 males, three to 72 days), and space flight (three males, 12 to 174 days) conditions. Using digital thermal thermometers, the morning and evening T values, namely, oral, rectal, and at 9 to 11 points on the body surface, were recorded at rest (under the ANOH and isolation conditions, bed rest regimen). The weighed average body and skin T, the chest–foot, core–membrane T-gradients, etc. were calculated. The flight pattern of the T-parameters of three astronauts preliminarily investigated under suit immersion conditions is given. The results of our studies show that, under real weightlessness and (partially) its terrestrial simulation conditions, the effectiveness of the thermoregulation mechanisms may decrease due to the changes noted at each of the main stages of heat exchange (metabolic heat production, transfer, and emission), up to the development of desynchronosis. The differences in individual adaptive shifts in the subjects differing in the level of thermal sensitivity, their interrelationship with the reactions of water–electrolyte metabolism, hormonal control, resting energy expenditure, and physical working capacity call for further natural and experimental studies.

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  1. Russian Federation State Research Center, Institute of Medical-Biological Problems, Russian Academy of Sciences, Khoroshevskoe shosse 76a, Moscow, 123007, Russia

    N. G. Lakota & I. M. Larina

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Lakota, N.G., Larina, I.M. Study of Temperature Homeostasis in Real and Simulated Weightlessness. Human Physiology 28, 322–332 (2002). https://doi.org/10.1023/A:1015513020425

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