Velocity of shortening of inspiratory muscles and inspiratory flow

Détails

ID Serval
serval:BIB_B983EE975BBA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Velocity of shortening of inspiratory muscles and inspiratory flow
Périodique
Journal of Applied Physiology
Auteur(s)
Fitting  J. W., Easton  P. A., Grassino  A. E.
ISSN
8750-7587 (Print)
Statut éditorial
Publié
Date de publication
02/1986
Volume
60
Numéro
2
Pages
670-7
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Feb
Résumé
Respiratory muscle length was measured with sonomicrometry to determine the relation between inspiratory flow and velocity of shortening of the external intercostal and diaphragm. Electromyographic (EMG) activity and tidal shortening of the costal and crural segments of the diaphragm and of the external intercostal were recorded during hyperoxic CO2 rebreathing in 12 anesthetized dogs. We observed a linear increase of EMG activity and peak tidal shortening of costal and crural diaphragm with alveolar CO2 partial pressure. For the external intercostal, no consistent pattern was found either in EMG activity or in tidal shortening. Mean inspiratory flow was linearly related to mean velocity of shortening of costal and crural diaphragm, with no difference between the two segments. Considerable shortening occurred in costal and crural diaphragm during inspiratory efforts against occlusion. We conclude that the relation between mean inspiratory flow and mean velocity of shortening of costal and crural diaphragm is linear and can be altered by an inspiratory load. There does not appear to be a relationship between inspiratory flow and velocity of shortening of external intercostals.
Mots-clé
Animals Carbon Dioxide Diaphragm/anatomy & histology/*physiology Dogs Electromyography Lung Volume Measurements Muscle Contraction *Respiration
Pubmed
Web of science
Création de la notice
25/01/2008 9:43
Dernière modification de la notice
20/08/2019 15:27
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