Alveolar Pathways during 90-Foot, Breath-Hold Dives

See allHide authors and affiliations

Science  28 Sep 1962:
Vol. 137, Issue 3535, pp. 1051-1052
DOI: 10.1126/science.137.3535.1051


The gas tensions of mixed expired and alveolar air were measured at various depths during descent and ascent. A reversed carbon dioxide gradient from the lungs into the blood was demonstrated at the 50-foot depth. At 90 feet, 45 percent of the pre-dive carbon dioxide content of the lungs had disappeared. There was no indication of a reversed oxygen gradient during ascent.