Journal of Applied Physiology AJP: Gastrointestinal and Liver Physiology
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J Appl Physiol 50: 650-657, 1981;
8750-7587/81 $5.00
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Journal of Applied Physiology, Vol 50, Issue 3 650-657, Copyright © 1981 by American Physiological Society

ARTICLES

Breathing at low lung volumes and chest strapping: a comparison of lung mechanics

N. J. Douglas, G. B. Drummond and M. F. Sudlow

In six normal subjects forced expiratory flow rates increased progressively with increasing degrees of chest strapping. In nine normal subjects forced expiratory flow rates increased with the time spent breathing with expiratory reserve volume 0.5 liters above residual volume, the increase being significant by 30 s (P less than 0.01), and flow rates were still increasing at 2 min, the longest time the subjects could breathe at this lung volume. The increase in flow after low lung volume breathing (LLVB) was similar to that produced by strapping. The effect of LLVB was diminished by the inhalation of the atropinelike drug ipratropium. Quasistatic recoil pressures were higher following strapping and LLVB than on partial or maximal expiration, but the rise in recoil pressure was insufficient to account for all the observed increased in maximum flow. We suggest that the effects of chest strapping are due to LLVB and that both cause bronchodilatation.


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