[Human adrenal function during prolonged exposure to hyperbaric conditions (N2-02, 5 atm)].

Test subjects were exposed to a nitrogen-oxygen atmosphere at 5 ata, performing various activities. The adrenal function of the subjects was examined with respect to the catecholamine and corticosteroids excretion in the urine. During adaptation to the environment the excretion of catecholamines and corticosteroids varied phasically. After 3 days of the 7-day exposure to the hyperbaric atmosphere and during decompression the excretion of norepinephrine increased and that of corticosteroids, particularly 17-corticosteroids, decreased. The diurnal rhythm of the excretion changed though the life regimen of the test subjects remained unaltered. These variations can be considered as adaptive-protective responses of the human body.