Journal of Applied Physiology AJP: Advances in Physiology Education
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 66: 1699-1705, 1989;
8750-7587/89 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Brancatisano, A.
Right arrow Articles by Engel, L. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Brancatisano, A.
Right arrow Articles by Engel, L. A.

Journal of Applied Physiology, Vol 66, Issue 4 1699-1705, Copyright © 1989 by American Physiological Society

ARTICLES

Postural changes in spontaneous and evoked regional diaphragmatic activity in dogs

A. Brancatisano, S. M. Kelly, A. Tully, S. H. Loring and L. A. Engel
Thoracic Medicine Unit, Westmead Hospital, Sydney, New South Wales, Australia.

We addressed the question whether gravity-dependent differences in passive tension and length of the diaphragm are associated with differences in its regional activation. By using intramuscular electrodes, we measured the electromyographic activity of different parts of the diaphragm (Edi) during quiet breathing in several postures in 13 anesthetized mongrel dogs. The Edi of the left and right costal hemi-diaphragm was compared between the left and right lateral decubitus postures, whereas that from the substernal and crural regions was compared between the supine and prone positions. On changing posture, the Edi of the dependent part of the diaphragm decreased in both cases, whereas that of the non-dependent part increased. The results were consistent with reflex modulation of regional diaphragm activation in response to postural changes in local resting length. However, these changes in Edi persisted after bilateral vagotomy, cordotomy (C7-T1) and dorsal rhizotomy of the C5-C7 roots. Compound muscle action potentials, recorded in different regions of the diaphragm and evoked by supramaximal stimulation of the phrenic nerves, were altered with changes in posture in the same direction as Edi. Because the stimuli were supramaximal, these changes reflected systematic changes in the recording conditions with posture, possibly because of a combination of 1) changes in the electrical environment surrounding the intramuscular electrodes and 2) passive changes in muscle length. Our results demonstrate systematic, reproducible, posture-dependent changes in regional Edi that may not be due to different neural drive.(ABSTRACT TRUNCATED AT 250 WORDS)


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
D. Leduc and A. De Troyer
Dysfunction of the canine respiratory muscle pump in ascites
J Appl Physiol, February 1, 2007; 102(2): 650 - 657.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
K. E. Finucane, J. A. Panizza, and B. Singh
Efficiency of the normal human diaphragm with hyperinflation
J Appl Physiol, October 1, 2005; 99(4): 1402 - 1411.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
J. E. Butler, D. K. McKenzie, and S. C. Gandevia
Discharge frequencies of single motor units in human diaphragm and parasternal muscles in lying and standing
J Appl Physiol, January 1, 2001; 90(1): 147 - 154.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online