[Effect of a nitrogen admixture in the inhaled oxygen on the effectiveness of 2-hour desaturation before decompression from 760 to 220 mm Hg]. / Vliianie primesi azota vo vdykhaemom kislorode na éffektivnost' dvukhchasovoi desaturatsii pered dekompressiei ot 760 k 220 mm rt. st.

The ground-based experimental study of denitrogenation by oxygen breathing showed that two-hour denitrogenation was inadequate if the breathing gas contained about 10% nitrogen or if the process included 3-10 min of air breathing. The reduction of the nitrogen content in the breathing gas to 0.4-5% eliminated severe forms of the decompression disease and decreased significantly the incidence of its mild forms to 3.2%. This allowed work of moderate load at the ambient pressure 220 mm Hg after two-hour breathing of oxygen with nitrogen admixture of no more than 5%.

[Physiologico-hygienic provisions for cosmonauts for their orbital flight]. / Fiziologo-gigienicheskie aspekty obespecheniia raboty kosmonavtov vo vremia orbital'nogo poleta.

This paper briefly describes physiologo-hygienic evaluations of space suits, data of the preflight training and extravehicular activities of the Salyut-6 crewmembers. It discusses changes in physiological parameters, energy expenditures, heat release and associated performance of the autonomic life support system. The paper also analyzes physiologo-hygienic aspects of the extravehicular activity of the Salyut-6 crewmembers.

[Probability of altitude decompression sickness following a drop in pressure from 840 to 308 mm Hg]. / Veroiatnost' vysotnoi dekompressionnoi bolezni posle perepada davlenii ot 840 do 308 mm rt. st.

The decompression from the hyperbaric air atmosphere with the pressure 840+/-5 mm Hg and subsequent 40 min exposure to the hypobaric atmosphere 308+/-1 mm Hg containing 40 to 95% O2 cause a decompression disease in 5-40% cases. The probability of the disease depends on the duration of nitrogen saturation at an increased pressure, physical fitness and individual susceptibility to decompression sickness.