Lung elastic recoil during breathing at increased lung volume

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...

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Bibliographic Details
Published in:	Journal of applied physiology (1985) Vol. 87; no. 4; pp. 1491 - 1495
Main Authors:	Rodarte, Joseph R, Noredin, Gassan, Miller, Charles, Brusasco, Vito, Pellegrino, Riccardo
Format:	Journal Article
Language:	English
Published:	Bethesda, MD Am Physiological Soc 01-10-1999 American Physiological Society
Subjects:	Adult Air breathing Anatomy & physiology Asthma Biological and medical sciences Elasticity Functional Residual Capacity Fundamental and applied biological sciences. Psychology Humans Lung - physiology Lung Compliance Lung Volume Measurements Lungs Male Plethysmography Reference Values Respiratory Physiological Phenomena Respiratory system Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics Tidal Volume Vertebrates: respiratory system Biomechanics Human Lung volume Lung Elasticity Recoil pressure Respiratory system Physical properties
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Summary:	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
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	8750-7587 1522-1601
DOI:	10.1152/jappl.1999.87.4.1491