Human resistance to transitional hypoxia during periodic stay in normobaric gas environments increases the fire safety of inhabited sealed objects of the navy

The aim is to assess the effect of the periodic stay of volunteers in normobaric hypoxic gas environments, designed to increase the fire safety of inhabited sealed objects of the Navy, on the hypoxic resistance of the body.
Research methods. 6 men (aged 21–25 years) participated in the bench tests. A gas environment with an oxygen content of 17–16% vol., Nitrogen — the rest, at normal barometric pressure and other microclimate parameters was maintained in the test bench. The duration of the bench tests was 60 consecutive days, during which the volunteers were kept in a hypoxic environment for 4 hours every day. Resistance to hypoxia was assessed using tests with breath-holding during inhalation and exhalation.
Results: in the course of the research, the fact of a decrease in the human tolerance of transient hypoxia when in specified hypoxic environments was revealed. However, taking into account that the degree of decrease in indicators was within the permissible values, the results obtained, in general, substantiate the possibility of using such gas environments to increase the fire safety of inhabited sealed objects.