SEASONAL CHANGES IN GAS EXCHANGE OF GENDER MIXED CREW IN CONDITIONS OF 8-MONTH ISOLATION IN A HERMETIC OBJECT WITH AN ARTIFICIAL GAS ENVIRONMENT

Within the framework of the international SIRIUS project, resting gas exchange studies were conducted in a gender mixed crew (3 men and 2 women), who stayed for a long time in a hermetic object with increased carbon dioxide concentration (not higher than 0.34 %) in an artificial gas environment. The results of measurements were used to estimate the minimum baseline oxygen requirements and carbon dioxide release in the crew at rest, in the supine position for 240 days of isolation during the simulation of the flight to the Moon in the SIRIUS-21 experiment. It was determined that in the spring calendar season of 2022 the crew under conditions of isolation from the effect of seasonal geophysical environmental factors had a reliable increase in the level of oxygen consumption relative to the winter season of 2021/22, which is interpreted as preservation of the seasonal biorhythm of hormonal regulation of gas-energy exchange. The spring increase in oxygen consumption by the entire crew amounted to 200 ml/min. Total oxygen consumption of the crew at rest under simulated isolation conditions decreased by 0.33 L/min (22%) compared to natural environmental conditions (background).Total crew carbon dioxide release under the same conditions decreased by 0.04 L/min (4%) compared to background levels. The results obtained in this work can be applied in the field of space and environmental physiology.