[The water-salt metabolic state of guinea pigs after a prolonged stay at different temperatures of a hyperbaric environment].

Guinea-pigs were exposed for 6-10 days to a helio-oxygen mixture with the pressure 6 x 10(5) and 36 x 10(5) Pa and temperature 30.5 degrees C to 34.5 degrees C. The concentration of cations was studied in the blood serum and cortex, outer medulla and papilla of the kidney. At the optimal temperature of the helio-oxygen mixture, the concentrations of sodium, potassium, calcium, magnesium and osmotically active substances did not differ from the control in the blood serum. In these conditions, the renal ability to create osmotic gradient does not change, i.e. the systems responsible for the permanence of the cation composition of internal milieu work in a sufficiently effective way and maintain a stable concentration of ions in the blood serum.