Document Detail


Estimation of ventilatory capacity during submaximal exercise.
MedLine Citation:
PMID:  8514724     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
There is presently no precise way to determine ventilatory capacity for a given individual during exercise; however, this information would be helpful in evaluating ventilatory reserve during exercise. Using schematic representations of maximal expiratory flow-volume curves and individual maximal expiratory flow-volume curves from four subjects, we describe a technique for estimating ventilatory capacity. In these subjects, we measured maximal expiratory flow-volume loops at rest and tidal flow-volume loops and inspiratory capacity (IC) during submaximal cycle ergometry. We also compared minute ventilation (VE) during submaximal exercise with calculated ventilatory maxima (VEmaxCal) and with maximal voluntary ventilation (MVV) to estimate ventilatory reserve. Using the schematic flow-volume curves, we demonstrated the theoretical effect of maximal expiratory flow and lung volume on ventilatory capacity and breathing pattern. In the subjects, we observed that the estimation of ventilatory reserve with use of VE/VEmaxCal was most helpful in indicating when subjects were approaching maximal expiratory flow over a large portion of tidal volume, especially at submaximal exercise levels where VE/VEmaxCal and VE/MVV differed the most. These data suggest that this technique may be useful in estimating ventilatory capacity, which could then be used to evaluate ventilatory reserve during exercise.
Authors:
T G Babb; J R Rodarte
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  74     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1993 Apr 
Date Detail:
Created Date:  1993-07-19     Completed Date:  1993-07-19     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2016-22     Citation Subset:  IM    
Affiliation:
Department of Medicine, Baylor College of Medicine, Houston, Texas.
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MeSH Terms
Descriptor/Qualifier:
Adult
Evaluation Studies as Topic
Exercise / physiology*
Forced Expiratory Volume
Humans
Male
Maximal Expiratory Flow-Volume Curves
Middle Aged
Respiratory Function Tests / methods,  statistics & numerical data
Tidal Volume
Total Lung Capacity*
Vital Capacity
Grant Support
ID/Acronym/Agency:
HL-07222/HL/NHLBI NIH HHS; HL-21584/HL/NHLBI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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