Abstract
Summary
Mice were exposed progressively to equivalent degrees of hypoxia breathing air and breathing 100% O2. The inspired pO2 level at which unconsciousness set in was found to be significantly lower when air was breathed than when 100% oxygen was breathed provided the rate of ascent was 2 × 103 ft/min or greater. This advantage of air over oxygen is attributed to the transient “N2 dilution” or R.Q. effect.
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