[Specifics of the stroke volume distribution in man before and after 3 day immersion].
Central blood circulation and local blood flow in the brain and lower extremities were studied in six healthy male subjects with the tetrapolar rheography before and after 3-day water immersion. Standing test was applied for functional evaluation. After immersion, distribution of the stroke volume along the arterial bed was modified as evidenced by relative growth of pulse filling in the lower extremities and relative reduction of pulse filling in the cranial vessels equally in horizontal and orthostatic position. Minute blood flow was unchanged in the brain and significantly increased in the lower extremities following immersion. Immersion did not alter the amplitude of the orthostatic reaction of pulse blood flow in the lower extremities but it was considerably behind the orthostatic reduction in the stroke volume in the brain. Possible mechanisms of this hemodynamic phenomenon are discussed.
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D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D001921:Brain / Q000098:blood supply; D006112:Gravitation; D006339:Heart Rate / Q000502:physiology; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D007024:Hypotension, Orthostatic / Q000175:diagnosis; D007101:Immersion / Q000503:physiopathology*; D008297:Male; D013318:Stroke Volume / Q000502:physiology*; D013997:Time Factors