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The aim of the study is to compare the results of using innovative normobaric hypoxic training to increase individual's resistance to exogenous hypothermia. Methods: This randomized controlled trial was performed using two groups of men aged 22-34 years. Group 1 (n=9) was exposed to argon-hypoxic training consisting of a 2-hour continuous stay of the test subjects in a gas environment with the composition: Ar 33 % vol., 02 12 % vol., N2 55 %. Group 2 (n=9) was exposed to a normobaric hypoxic training: a 2-hour continuous stay in a nitrogen-containing gas environment, the oxygen content of which decreased from 17 % vol. (1st session) up to 13 % vol. (5th session), after which the composition of the gas environment was not changed. The total number of sessions- 20 conducted daily or after 1-2 days. Training schedules were identical in the two groups. Hypothermic resistance of the subjects was evaluated using 3-minute standard aerocryothermic tests. The activity of the mechanisms of nonspecific protection of the subjects was evaluated by the indicator of serum fibronectin. Results: An improved resistance to hypothermia was observed in both groups. The changes were more pronounced in Group 1. So, with the best subjective resistance to hypothermia exposures in group 1 (p = 0.010-0.014), rectal temperature decrease (p = 0.019) was significantly greater in group 1 than in group 2. Hypereactivity of systemic circulation indicators decreased in Group 1 to a greater extent (p = 0.010-0.038). In addition, with a significant increase in the level of fibronectin in both groups, these changes were significantly (p = 0.014) more pronounced in Group 1. Conclusions: Normobaric hypoxic training in the original regime is a safe and effective method of increasing human resistance to hypothermia. The effectiveness of this method can be improved by conducting argon-hypoxic training developed by the authors.

NON-SPECIFIC NON-MEDICAL TECHNOLOGIES TO INSCREASE HUMAN RESISTANCE TO HYPOTHERMIA