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  • Title: [Brain blood circulation and oxygen supply in the healthy human being during measured physical loading in a head-down tilt posture].
    Author: Katkov VE, Pravetskiĭ NV.
    Journal: Kosm Biol Aviakosm Med; 1985; 19(6):32-4. PubMed ID: 4087857.
    Abstract:
    Eleven healthy male test subjects performed exercises of 600 kgm/min (98 W) for 20 min in the head-down position (-15 degrees). A day before exercises they were catheterized, with catheters implanted into the internal jugular vein and brachial artery. It was shown that exercises in the head-down position led to an increase in cerebral circulation, a decrease in oxygen utilization and a decrease in jugular pressure. CO2 tension in arterial blood and blood outflowing from the brain remained comparatively stable, while base deficiency and buffer capacity decreased by a similar value.
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