Journal of Applied Physiology Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 48: 977-981, 1980;
8750-7587/80 $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 Bjurstedt, H.
Right arrow Articles by Lindborg, B.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Bjurstedt, H.
Right arrow Articles by Lindborg, B.

Journal of Applied Physiology, Vol 48, Issue 6 977-981, Copyright © 1980 by American Physiological Society

ARTICLES

Responses to continuous negative-pressure breathing in man at rest and during exercise

H. Bjurstedt, G. Rosenhamer, C. M. Hesser and B. Lindborg

We studied the respiratory and circulatory effects in six healthy supine volunteers of continuous negative-pressure breathing (CNPB) at -15 and -30 cmH2O at rest and during dynamic leg exercies at 50% of individual working capacity. CNPB had no significant effects on respiratory minute volume, tidal volume, or arterial carbon dioxide tension. Mean arterial pressure remained essentially unchanged both at rest and during exercise, signifying that the reductions in intrathoracic pressure caused corresponding increases in left ventricular afterload. Nevertheless, cardiac output increased significantly in both conditions, causing reductions of mean central venous pressure that were considerably greater during exercise than at rest. These responses were reflected by increments in left ventricular work, amounting to 24 and 20% at rest and during exercise, respectively, at -30 cmH2O. We conclude that in CNPB at rest the increased activity of the left ventricle with associated juxtathoracic venous collapse protects the right heart and pulmonary circulation from congestion and that it does so even more effectively during exercise.


This article has been cited by other articles:


Home page
 ChestHome page
G. J. Gates, S. E. Mateika, R. C. Basner, and J. H. Mateika
Baroreflex Sensitivity in Nonapneic Snorers and Control Subjects Before and After Nasal Continuous Positive Airway Pressure
Chest, September 1, 2004; 126(3): 801 - 807.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
Y. Kamijo, Y. Takeno, A. Sakai, M. Inaki, T. Okumoto, J. Itoh, Y. Yanagidaira, S. Masuki, and H. Nose
Plasma lactate concentration and muscle blood flow during dynamic exercise with negative-pressure breathing
J Appl Physiol, December 1, 2000; 89(6): 2196 - 2205.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
K. Nagashima, H. Nose, A. Takamata, and T. Morimoto
Effect of continuous negative-pressure breathing on skin blood flow during exercise in a hot environment
J Appl Physiol, June 1, 1998; 84(6): 1845 - 1851.
[Abstract] [Full Text] [PDF]


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