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J Appl Physiol 61: 312-317, 1986;
8750-7587/86 $5.00
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Journal of Applied Physiology, Vol 61, Issue 1 312-317, Copyright © 1986 by American Physiological Society

ARTICLES

Effect of breathing dry air on structure and function of airways

J. C. Van Oostdam, D. C. Walker, K. Knudson, P. Dirks, R. W. Dahlby and J. C. Hogg

We compared the effect of breathing dry air (0.70 mg H2O/l) with that of breathing room air (8.62 mg H2O/l) in guinea pigs anesthetized with urethane. The data showed that breathing dry air caused a reduction of extravascular water (EVW) in the trachea (P less than 0.01) but not the lung. Structural analysis showed that this water loss occurred from the loose connective tissue of the submucosa. Histamine dose response curves performed on the animals showed that breathing dry air caused an increase in the maximum response (delta max RL) (P less than 0.01) without changing either the dose required to produce 50% of the delta max RL or the ratio of delta max RL to this dose. We conclude that breathing dry air produces an acute reduction of EVW of the loose connective tissue of the airways and an increase in the maximum response to histamine.


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