Effect of transdiaphragmatic pressure partitioning on activation and fatigue of the diaphragm

Détails

ID Serval
serval:BIB_03A2BD9E36F3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Effect of transdiaphragmatic pressure partitioning on activation and fatigue of the diaphragm
Périodique
American Review of Respiratory Disease
Auteur⸱e⸱s
Bradley  T. D., Chartrand  D. A., Fitting  J. W., Comtois  A., Grassino  A.
ISSN
1073-449X
0003-0805 (Print)
Statut éditorial
Publié
Date de publication
06/1988
Volume
137
Numéro
6
Pages
1395-400
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Jun
Résumé
Fatiguing contractions of the diaphragm during inspiratory resistive loading are accompanied by a predictable rate of decay in the high/low (H/L) frequency ratio of the diaphragmatic EMG (EMG-DI) when the esophageal and gastric pressure (Pes and Pga) components of transdiaphragmatic pressure (Pdi) are equal. However, Pes and Pga do not contribute equally to Pdi under a number of clinical and physiologic conditions. We therefore tested the effect of varying the Pes and Pga contribution to Pdi on the EMG-DI using an esophageal electrode in 5 normal men during fatiguing contractions. Falls in the H/L occurred in all subjects regardless of the relative contribution of Pes and Pga to Pdi at a tension-time index of 0.29 +/- 0.1 (mean +/- SE). However, the time constant of decay of the H/L varied widely among subjects when Pes predominated (173.9 +/- 45.7 s; coefficient of variation, 58.7%) or Pga predominated (78.4 +/- 19.4 s; coefficient of variation, 55.2%), whereas it was consistent among subjects when Pes and Pga were equal (72.3 +/- 3.8 s; coefficient of variation, 11.6%). In addition, a significant relationship was found between the mean integrated activity of the EMG-DI compared with maximum and the time constant of decay of the H/L (r = 0.57, p less than 0.03). We conclude that the differences in the rate of decay of the H/L was at least partly a result of differences in the relative activation of the crural diaphragm at the same Pdi.
Mots-clé
Adult Diaphragm/*physiology Electromyography Esophagus/physiology Humans Male Muscle Contraction Pressure Regression Analysis Stomach/physiology
Pubmed
Web of science
Création de la notice
25/01/2008 9:43
Dernière modification de la notice
20/08/2019 12:25
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