Dissociation between diaphragmatic and rib cage muscle fatigue

Détails

ID Serval
serval:BIB_921C772F0BE1
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Dissociation between diaphragmatic and rib cage muscle fatigue
Périodique
Journal of Applied Physiology
Auteur(s)
Fitting  J. W., Bradley  T. D., Easton  P. A., Lincoln  M. J., Goldman  M. D., Grassino  A.
ISSN
8750-7587 (Print)
Statut éditorial
Publié
Date de publication
03/1988
Volume
64
Numéro
3
Pages
959-65
Notes
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S. --- Old month value: Mar
Résumé
To assess rib cage muscle fatigue and its relationship to diaphragmatic fatigue, we recorded the electromyogram (EMG) of the parasternal intercostals (PS), sternocleidomastoid (SM), and platysma with fine wire electrodes and the EMG of the diaphragm (DI) with an esophageal electrode. Six normal subjects were studied during inspiratory resistive breathing. Two different breathing patterns were imposed: mainly diaphragmatic or mainly rib cage breathing. The development of fatigue was assessed by analysis of the high-to-low (H/L) ratio of the EMG. To determine the appropriate frequency bands for the PS and SM, we established their EMG power spectrum by Fourier analysis. The mean and SD for the centroid frequency was 312 +/- 16 Hz for PS and 244 +/- 48 Hz for SM. When breathing with the diaphragmatic patterns, all subjects showed a fall in H/L of the DI and none had a fall in H/L of the PS or SM. During rib cage emphasis, four out of five subjects showed a fall in H/L of the PS and five out of six showed a fall in H/L of the SM. Four subjects showed no fall in H/L of the DI; the other two subjects were unable to inhibit diaphragm activity to a substantial degree and did show a fall in H/L of the DI. Activity of the platysma was minimal or absent during diaphragmatic emphasis but was usually strong during rib cage breathing. We conclude that fatigue of either the diaphragm or the parasternal and sternocleidomastoid can occur independently according to the recruitment pattern of inspiratory muscles.(ABSTRACT TRUNCATED AT 250 WORDS)
Mots-clé
Adult Diaphragm/*physiopathology Electromyography Fatigue/*physiopathology Humans Male Middle Aged Pressure Respiration Respiratory Muscles/*physiopathology
Pubmed
Web of science
Création de la notice
25/01/2008 10:43
Dernière modification de la notice
03/03/2018 19:30
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