[The central nervous system function of guinea pigs after a prolonged stay in an artificial gaseous environment of varying composition].

The pattern of statistical and correlational-spectral parameters of the heart rate characterising the CNS regulatory functions, was estimated in guinea pigs after their prolonged stay in an artificial gas milieu at the pressure 71 kGs/cm2. The obviousness of activation of subcortical centres was significantly lower after stay in the oxygen-helium-nitrogen mixture than in the oxygen-helium one. The increase of the oxygen partial pressure up to 0.3 kGs/cm2 exerted a favourable effect.