[Determination of the functional activity of the sea man's body]

Central hemodynamics was examined in members of 5 crews on 75- to 167-d voyages in different areas of the world ocean (1496 observations). Also, 461 observations were made in a nuclear submarine on a 73-d submerged cruise. As a result of testing the fidelity of Myznikov's index (MI = SBP/DBP (HR). levels of the seaman's body functional activity was quantified by isolating sigma corridors. In approximately 70% of the seamen in both groups the body functional activity was moderate. Low functional activity was 1.9 times and very high functional activity--1.9 times less often among submariners as compared with the surface crew which means inequality in the physiological activity of the seamen. From these results we deduce that MI can be instrumental in monitoring adaptation to the sea duties as it permits determine the physiological adaptability of seamen and dynamics of the body adjustment.