Velocity of shortening of inspiratory muscles and inspiratory flow

Details

Serval ID
serval:BIB_B983EE975BBA
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Velocity of shortening of inspiratory muscles and inspiratory flow
Journal
Journal of Applied Physiology
Author(s)
Fitting  J. W., Easton  P. A., Grassino  A. E.
ISSN
8750-7587 (Print)
Publication state
Published
Issued date
02/1986
Volume
60
Number
2
Pages
670-7
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Feb
Abstract
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.
Keywords
Animals Carbon Dioxide Diaphragm/anatomy & histology/*physiology Dogs Electromyography Lung Volume Measurements Muscle Contraction *Respiration
Pubmed
Web of science
Create date
25/01/2008 9:43
Last modification date
20/08/2019 15:27
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