Abstract
Subcutaneous adipose tissue blood flow (ATBF) was measured by the 133Xe washout method in normal men breathing oxygen at partial pressures from 0.1 to 2 atmospheres. Breathing oxygen at partial pressures of 0.1 and 1 atm. increased and reduced ATBF by 56% and 26%, respectively as compared to air breathing. These effects were highly significant. Breathing of oxygen at 2 atm. partial pressure had no consistent effect on ATBF, although considerable changes--positive or negative--could been seen in some experiments. Oxygen-breathing at 1 atm. partial pressure is associated with a slight hyperventilation and fall in PACO2. This was shown to be without importance for the effect of oxygen on adipose tissue blood flow.
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