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


     

J Appl Physiol 65: 2427-2433, 1988;
8750-7587/88 $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 Farkas, G. A.
Right arrow Articles by Rochester, D. F.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Farkas, G. A.
Right arrow Articles by Rochester, D. F.

Journal of Applied Physiology, Vol 65, Issue 6 2427-2433, Copyright © 1988 by American Physiological Society

ARTICLES

Characteristics and functional significance of canine abdominal muscles

G. A. Farkas and D. F. Rochester
Department of Internal Medicine, University of Virginia School of Medicine, Charlottesville 22908.

To assess the characteristics and function of the muscles of the anterolateral abdominal wall, we have examined the isometric contractile properties of bundles of canine rectus abdominis (RA) and external oblique (EO) muscles. In addition, we have related the lengths of these muscles measured sonometrically in vivo at supine functional residual capacity (FRC) to in vitro optimal force-producing length (Lo). We also investigated the action of the abdominal muscles on the displacement of costal and crural diaphragm. We found that 1) contraction time of RA was longer and that the RA developed greater force than the EO at submaximal stimulation frequencies; 2) maximal tetanic force and the active length-tension curves were similar in both abdominal muscles; 3) on passive stretch, the compliance of the RA was one-third that of the EO; 4) at supine FRC, the EO is operating at 83% of Lo, whereas the RA is operating at 105% of Lo; 5) stimulation of either RA or EO (abdominal pressure of 15 cmH2O) lengthened the costal and crural diaphragm toward their Lo values, with greater crural excursion occurring than costal. We conclude that the RA is well suited for restraining the abdominal viscera in prone quadrupeds, whereas the EO is better designed to assist expiration. Stimulation of both muscles improves in situ diaphragmatic operating length.


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
D. Leduc and A. De Troyer
Impact of acute ascites on the action of the canine abdominal muscles
J Appl Physiol, June 1, 2008; 104(6): 1568 - 1573.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
L. A. Cotter, H. E. Arendt, J. G. Jasko, C. Sprando, S. P. Cass, and B. J. Yates
Effects of postural changes and vestibular lesions on diaphragm and rectus abdominis activity in awake cats
J Appl Physiol, July 1, 2001; 91(1): 137 - 144.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
A. F. DiMarco, J. R. Romaniuk, K. E. Kowalski, and G. Supinski
Mechanical contribution of expiratory muscles to pressure generation during spinal cord stimulation
J Appl Physiol, October 1, 1999; 87(4): 1433 - 1439.
[Abstract] [Full Text] [PDF]


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