Ultrasonic dopplerograpy of peripheral, including transcranial, blood circulation was performed in 8 normal volunteers for 7-day dry immersion experiment. Linear blood velocity (LBV) was measured in main arteries and veins of the head and lower extremities. Investigations were conducted on days 2 and 5 of immersion and on day 2 of recovery. The data were compared with baseline values determined before the experiment. LBV slowed down in all the vessels under investigation; the effect was most pronounced in the veins. On day 5, behavior of venous cerebral circulation in some of the volunteers indirectly attested to elevation of intracranial pressure. In the period of recovery, arterial LBV was largely equal to baselines values. Slower recovery of venous blood circulation was treated as an aftereffect of support deprivation.
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