[Feasibility of using a test involving exposure of the lower half of the body to negative pressure for selection of cosmonaut candidates]. / Izuchenie vozmozhnosti ispol'zovaniia proby s vozdeistviem otritsatel'nogo davleniia na nizhniuiu polovinu tela primenitel'no k otboru kandidatov v kosmonavty.

By means of regional rheography and electrocardiography cardiovascular reactions to LBNP (25 mm Hg--2 min; 35 mm Hg--3 min; 40 mm Hg--5 min; 50 mm Hg--5 min) were studied in 60 young male test subjects (aged 25--42). Changes in the content and excretion of catecholamines were followed before and after LBNP in II test subjects. The investigations helped to elucidate mechanisms of compensatory and related reactions of the cardiovascular and sympathoadrenal systems. Diagnostic and prognostic criteria to evaluate LBNP tolerance were established. The criteria can be used to assess functional capabilities of the cardiovascular system and to predict orthostatic tolerance of cosmonaut candidates.