[Status of human hemodynamics during water immersion in different postures of immersion].

Central and peripheral hemodynamics was investigated in 16 essentially healthy volunteers who performed a routine tilt test or a tilt test in water immersion. Unlike tilt tests carried out before water immersion, the supine to up-right transfer in water did not change cardiac rhythm, cardiac output, leg blood flow or other circulation parameters. The fact that there are no posture-related circulation changes in water immersion suggests that the horizontal and upright positions in water can be viewed as hemodynamically similar.