Journal of Applied Physiology
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J Appl Physiol 87: 1491-1495, 1999;
8750-7587/99 $5.00
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Vol. 87, Issue 4, 1491-1495, October 1999

INVITED REVIEW
Lung elastic recoil during breathing at increased lung volume

Joseph R. Rodarte1, Gassan Noredin1, Charles Miller1, Vito Brusasco2
Riccardo Pellegrino3
(With the Technical Assistance of Todd M. Officer)

1 Department of Medicine, Pulmonary Section, Baylor College of Medicine, Houston, Texas 77030; 2 Dipartimento di Scienze Motorie e Riabilitative, Università degli Studi di Genova, 16132 Genova; and 3 Fisiopatalogia Respiratoria, Ospedale A. Carle, 12100 Cuneo, Italy

During dynamic hyperinflation with induced bronchoconstriction, there is a reduction in lung elastic recoil at constant lung volume (R. Pellegrino, O. Wilson, G. Jenouri, and J. R. Rodarte. J. Appl. Physiol. 81: 964-975, 1996). In the present study, lung elastic recoil at control end inspiration was measured in normal subjects in a volume displacement plethysmograph before and after voluntary increases in mean lung volume, which were achieved by one tidal volume increase in functional residual capacity (FRC) with constant tidal volume and by doubling tidal volume with constant FRC. Lung elastic recoil at control end inspiration was significantly decreased by ~10% within four breaths of increasing FRC. When tidal volume was doubled, the decrease in computed lung recoil at control end inspiration was not significant. Because voluntary increases of lung volume should not produce airway closure, we conclude that stress relaxation was responsible for the decrease in lung recoil.

hyperinflation; elastic recoil; asthma


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