Abstract
Eight young male subjects, 21-25 years of age, were studied during isometric elbow flexion at each of 1.0, 1.5, 2.0, 2.5 and 3.0 atm abs ambient pressure to observe the effects of increased ambient pressure on pulmonary ventilation, carbon dioxide output, ratio of carbon dioxide annexing, oxygen uptake, ratio of oxygen removal and heart rate.The analysis of variance for each of these items showed that pulmonary ventilation, carbon dioxide output and heart rate decreased linealy in accordance with the increase in ambient pressure. Oxygen uptake and ratio of carbon dioxide annexing confirmed no statistically significant changes as a result of chang in ambient pressure. The ratio of oxygen removal was significantly affected by the quadratic component of ambient pressure factor, being the lowest at about 2.0 atm abs and increasing with pressure change from 2.0 atm abs either toward lower and higher ambient pressures.Observed changes in these cardiopulmonary functions could be attributed at least in part to the increased density of respired air and/or the rised partial pressure of oxygen.
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