[Central and general hemodynamics in healthy persons during simulated weightlessness].
The pumping and contractile functions of the left ventricle were investigated during combined exposure to water immersion and head-down tilt (at -6 degrees) that simulated microgravity. This 7-day exposure caused noticeable changes in central and systemic circulation which developed as a function of time. It is assumed that the deficiency of venous blood return seen on test days 1-3 was a compensatory response to initial blood displacement which was induced by a reduction of the circulating blood volume. The reduction was in turn a result of responses from volumoreceptors of the heart and intrathoracic vessels to "excessive" intrathoracic blood volume.
Kazanova
R T
RT
Katuntsev
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VP
D000328:Adult; D000337:Aerospace Medicine; D002940:Circadian Rhythm; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D007101:Immersion; D007103:Immobilization; D008297:Male; D008955:Models, Cardiovascular; D009200:Myocardial Contraction / Q000502:physiology*; D011187:Posture; D013997:Time Factors; D014893:Weightlessness
Sostoianie tsentral'noĭ i obshcheĭ gemodinamiki u zdorovogo cheloveka v usloviiakh modelirovannoĭ nevesomosti.