VOLUME DEPENDENCE OF INSTANTANEOUS TIME CONSTANTS DERIVED FROM MAXIMAL EXPIRATORY FLOW-VOLUME CURVE
- 1 January 1977
- journal article
- research article
- Published by Elsevier
- Vol. 115 (5) , 805-810
- https://doi.org/10.1164/arrd.1977.115.5.805
Abstract
A simple expansion of the information in the maximal expiratory flow-volume curve was used to measure the convexity to the volume axis of maximal expiratory flow-volume curves produced by 11 asymptomatic smokers and 11 asymptomatic nonsmokers. The ratio of remaining volume to maximal flow was equal to the product of upstream resistance and chord compliance. This instantaneous time constant increased more near residual volume in the smokers. Using this method, plethysmographically obtained maximal expiratory flow-volume curves were more sensitive than spirometrically obtained maximal expiratory flow-volume curves. This method compared favorably with moment analysis and He response of maximal expiratory flow as a separator of asymptomatic smokers and nonsmokers.This publication has 1 reference indexed in Scilit:
- Determinants of maximal expiratory flow from the lungs.Journal of Applied Physiology, 1967