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Pulmonary tolerance in man to continuous oxygen exposure at 3.0, 2.5, 2.0, and 1.5 ATA in Predictive Studies VOxygen effects on pulmonary function were measured in normal, resting men who breathed oxygen continuously at 3.0, 2.5, 2.0, and 1.5 ATA to predefined limits of CNS, cardiac, or pulmonary tolerance. Rates of pulmonary symptom intensification and decrease in vital capacity (VC) increased progressively with elevation of inspired oxygen pressure. Although VC decrements occurred concurrently with symptoms, the lung volume changes became prominent when symptoms were still mild. The observed effects were consistent with the interpretation that small airway function is impaired more selectively by oxygen exposure at 3.0 and 2.5 ATA than by exposure at 2.0 and 1.5 ATA. Despite similar VC changes after oxygen exposure at 2.0 ATA for nearly 10 hr and exposure at 1.5 ATA for almost 18 hr, the 2.0 ATA exposure caused greater impairment of pulmonary function and required a longer recovery period.
Document ID
19890066327
Document Type
Conference Paper
Authors
Clark, J. M.
Gelfand, R.
Flores, N. D.
Lambertsen, C. J.
Pisarello, J. B.
Date Acquired
August 14, 2013
Publication Date
March 1, 1987
Subject Category
AEROSPACE MEDICINE
Funding Number(s)
CONTRACT_GRANT: N00014-81-C-0826
CONTRACT_GRANT: NAS9-17238
Distribution Limits
Public
Copyright
Other