| Popis: |
This chapter discusses the arterial blood gases, heart rate, and gas exchange during rest and exercise in men saturated at a simulated seawater depth of 1000 ft. In a study described in the chapter, physiological measurements were obtained from each of three healthy male volunteers during alternating periods of exercise and rest. Studies were performed on two or more occasions at the surface, once when the subjects were saturated at a simulated seawater depth of 320 ft, and once when they were saturated at a simulated depth of 1000 FSW, within a dry compression chamber. At 31.3 atm abs, the inspired O 2 pressure ranged from 216 to 221 mmHg, and the inspired P co 2 was never more than 0.5 mmHg. There did not appear to be any consistent difference between pulmonary-gas-exchange values obtained during rest at surface pressure and those obtained at depth, except for the higher arterial P O2 and larger alveolar–arterial P o 2 differences. Alveolar hypoventilation with concomitant elevations in P a co 2 has been reported during exercise in hyperbaric conditions. |
