Document Detail


Ventilatory control during exercise in children with mild or moderate asthma.
MedLine Citation:
PMID:  2494415     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this study was to specify whether during exercise the neural response to increased resistive load in asthmatic children corresponds to a modification of the neuromuscular inspiratory drive, to a modification of the breathing pattern, or to both. Thus, nine children with mild or moderate asthma (aged 10-15 yr) and nine normal children (aged 11-16 yr) were studied during an incremental load exercise with a cyclic ergometer, the load of which was increased by steps of 30 W.3 min-1. During the 3rd min of each workload, we measured the following parameters: O2 consumption (VO2), CO2 production (VCO2), ventilation (VE), tidal volume (VT), respiratory frequency (f), ratio of inspiratory to total time of respiratory cycle (T1/TTOT), mean inspiratory flow (VT/T1) as well as mouth occlusion pressure measured at 100 ms (P0.1), and inspiratory power for breathing (W). At maximum level, the two groups showed identical values for heart rate, ventilation divided by weight (VEBW), T1/TTOT), VT/T1, P0.1, and W. However, asthmatic children had lower maximal power (P less than 0.02), higher tidal volume divided by weight (VTBW) (P less than 0.05), and lower f (P less than 0.01). At a same level of exercise (60, 90, or 120 W), in both groups, we found identical values for P0.1, VEBW, VO2, T1/TTOT, and VTBW/T1. However, asthmatic patients exhibited higher VTBW and lower f(limit of significance). This resulted from higher inspiratory and total time durations. Furthermore, they showed a higher inspiratory power for breathing. It was the same for f and VTBW if the results were expressed in relation to the VO2 in ml.kg-1.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
M Ramonatxo; F A Amsalem; J G Mercier; R Jean; C G Prefaut
Related Documents :
7380705 - Diaphragmatic function in healthy subjects during partial curarization.
2917945 - Calibration of respiratory inductive plethysmograph during natural breathing.
21525045 - Development of nuclear emergency exercise programme (neep) in korea.
16959365 - Lactate and ventilatory thresholds in type 2 diabetic women.
407805 - Serum total and free thyroxine and triiodothyronine during dynamic muscular exercise in...
25323335 - Benefits of an oxygen reservoir cannula versus a conventional nasal cannula during exer...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  21     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1989 Feb 
Date Detail:
Created Date:  1989-05-11     Completed Date:  1989-05-11     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  11-7     Citation Subset:  IM; S    
Affiliation:
Laboratoire de Physiologie Respiratoire, Hôpital Aiguelongue, Montpellier, France.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adolescent
Asthma / physiopathology*
Carbon Dioxide / analysis
Child
Forced Expiratory Flow Rates
Humans
Inspiratory Capacity
Lung Volume Measurements
Maximal Midexpiratory Flow Rate
Oxygen Consumption
Physical Exertion*
Respiration*
Respiratory Muscles / physiopathology
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide

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


Previous Document:  Blood serum galactosyltransferase in oncologic diseases
Next Document:  Effects of low- and moderate-intensity training in spinal cord-injured persons.