The relation of inspiratory effort sensation to fatiguing patterns of the diaphragm

Détails

ID Serval
serval:BIB_5A712EAB19FA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
The relation of inspiratory effort sensation to fatiguing patterns of the diaphragm
Périodique
American Review of Respiratory Disease
Auteur⸱e⸱s
Bradley  T. D., Chartrand  D. A., Fitting  J. W., Killian  K. J., Grassino  A.
ISSN
1073-449X
0003-0805 (Print)
Statut éditorial
Publié
Date de publication
12/1986
Volume
134
Numéro
6
Pages
1119-24
Notes
Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't --- Old month value: Dec
Résumé
Tension in the respiratory muscles and the subsequent intrathoracic subatmospheric pressure swing plays a role in respiratory effort sensation. However, the role of a diaphragmatic fatiguing process in the genesis of this sensation has not been examined. Therefore, we studied the effect of fatiguing contractions of the diaphragm on inspiratory effort sensation (IES) in 6 normal male subjects during inspiratory resistive loading. Four diaphragmatic fatiguing and 4 diaphragmatic nonfatiguing patterns were developed for each subject. These 8 patterns were imposed in random order for 10 breaths (50 s) with duty cycle and tidal volume fixed. The presence or absence of a diaphragmatic fatiguing process was confirmed by analysis of the high to low ratio of the electromyographic signal from an esophageal electrode. Subjects scored their IES immediately after each run using a modified Borg scale. There was a very strong correlation between IES and esophageal pressure (Pes) expressed as a percentage of maximal inspiratory esophageal pressure (Pes/Pesmax %) (r = 0.88, p less than 0.001). However, IES was independent of the presence of a diaphragmatic fatiguing pattern. Furthermore, there was no difference in the slope or intercept of the regression lines relating IES to Pes/Pesmax % when fatiguing and nonfatiguing runs were analyzed separately. We conclude that the severity of IES during resistive loading held for 50 s is independent of the development of diaphragmatic fatigue.
Mots-clé
Adult Diaphragm/*physiology Electromyography/instrumentation/methods Fatigue/physiopathology Humans Male Muscle Contraction Pressure *Respiration Respiratory Function Tests/instrumentation/methods Respiratory Muscles/*physiology Sensation/*physiology
Pubmed
Web of science
Création de la notice
25/01/2008 10:43
Dernière modification de la notice
20/08/2019 15:13
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