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Prolonged oxygen exposures in immersed exercising divers at 25 fsw (1.76 ATA).

Publication ,  Journal Article
Piantadosi, CA; Clinton, RL; Thalmann, ED
Published in: Undersea Biomed Res
December 1979

Twenty-four oxygen exposures lasting 80 to 271 min were performed by six immersed exercising subjects at 25 fsw (1.76 ATA) in both warm and cold water. Two types of exercise were performed, moderate work (50 watts) for long periods of time, and graded exercise (25-150 watts) lasting 85 min. In 21 degrees C water, moderate exercise lasted 228 +/- 39 min, with a mean VO2 of 1.72 +/- 0.11 liter/min. In 4 degree C water, the duration was 163 +/- 22 min, with a mean VO2 of 1.83 +/- 0.16 liter/min. The differences in duration of oxygen exposure in warm and cold water reflect termination at an inspired PCO2 of 7.6 mmHg, a level reached earlier in cold water because of CO2 absorbent exhaustion. In 21 degrees C water, the VO2 for graded exercise ranged from 1.51 to 3.00 liter/min and in 4 degrees C water, from 2.00 to 3.16 liter/min. Central nervous system oxygen toxicity was not observed during these exposures, although two divers had clinical and spirometric evidence of early pulmonary oxygen toxicity. The absence of CNS oxygen toxicity is attributed to low resistance and minimization of dead space, which caused a low inspired PCO2, although the divers' experience with oxygen diving and their excellent physical condition may have contributed as well.

Duke Scholars

Published In

Undersea Biomed Res

ISSN

0093-5387

Publication Date

December 1979

Volume

6

Issue

4

Start / End Page

347 / 356

Location

United States

Related Subject Headings

  • Temperature
  • Physical Exertion
  • Oxygen
  • Male
  • Humans
  • Diving
  • Carbon Dioxide
  • Airway Resistance
  • Adult
 

Citation

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Piantadosi, C. A., Clinton, R. L., & Thalmann, E. D. (1979). Prolonged oxygen exposures in immersed exercising divers at 25 fsw (1.76 ATA). Undersea Biomed Res, 6(4), 347–356.
Piantadosi, C. A., R. L. Clinton, and E. D. Thalmann. “Prolonged oxygen exposures in immersed exercising divers at 25 fsw (1.76 ATA).Undersea Biomed Res 6, no. 4 (December 1979): 347–56.
Piantadosi CA, Clinton RL, Thalmann ED. Prolonged oxygen exposures in immersed exercising divers at 25 fsw (1.76 ATA). Undersea Biomed Res. 1979 Dec;6(4):347–56.
Piantadosi, C. A., et al. “Prolonged oxygen exposures in immersed exercising divers at 25 fsw (1.76 ATA).Undersea Biomed Res, vol. 6, no. 4, Dec. 1979, pp. 347–56.
Piantadosi CA, Clinton RL, Thalmann ED. Prolonged oxygen exposures in immersed exercising divers at 25 fsw (1.76 ATA). Undersea Biomed Res. 1979 Dec;6(4):347–356.

Published In

Undersea Biomed Res

ISSN

0093-5387

Publication Date

December 1979

Volume

6

Issue

4

Start / End Page

347 / 356

Location

United States

Related Subject Headings

  • Temperature
  • Physical Exertion
  • Oxygen
  • Male
  • Humans
  • Diving
  • Carbon Dioxide
  • Airway Resistance
  • Adult