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


     

J Appl Physiol 64: 1203-1209, 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 Manohar, M.
Right arrow Articles by Nganwa, D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Manohar, M.
Right arrow Articles by Nganwa, D.

Journal of Applied Physiology, Vol 64, Issue 3 1203-1209, Copyright © 1988 by American Physiological Society

ARTICLES

Diaphragmatic O2 and lactate extraction during submaximal and maximal exertion in ponies

M. Manohar, T. E. Goetz, L. C. Holste and D. Nganwa
Department of Veterinary Biosciences, College of Veterinary Medicine, University of Illinois, Urbana-Champaign 61801.

Diaphragmatic O2 and lactate extraction were studied in 10 healthy ponies at rest and during treadmill exercise. The phrenic vein was aseptically catheterized via a lateral thoracotomy 8-35 days before the study. Arterial and phrenic venous blood samples were obtained simultaneously at rest and at 30-s intervals during 4 min of exertion. Three levels of exertion were studied (moderate, 10 mi/h; heavy, 15 mi/h; maximal, 20 mi/h), and a rest period of at least 90 min was allowed between them. Each pony was studied twice at least 2-3 days apart. At rest the diaphragmatic venous PO2, O2 saturation, arteriovenous O2 content difference, and O2 extraction were 43.2 +/- 2.0 Torr, 76.1 +/- 3.2%, 3.14 +/- 0.43 ml/dl, and 23.60 +/- 3.61%, respectively. Significant decrease in phrenic venous PO2 and O2 saturation occurred within 30 s of exercise. Phrenic venous PO2 decreased to 20.3 +/- 1.0, 18.9 +/- 1.1, and 15.4 +/- 0.9 Torr at 120 s of moderate, heavy, and maximal exercise, respectively. Corresponding values of phrenic venous O2 saturation were 33.6 +/- 2.2, 25.8 +/- 2.1, and 17.9 +/- 0.5%, respectively. Diaphragmatic arteriovenous O2 content difference expanded to 13.11 +/- 0.49, 15.00 +/- 0.60, and 16.90 +/- 0.60 ml/dl at 120 s of moderate, heavy, and maximal exercise, respectively, as O2 extraction rose to 65.93 +/- 1.98, 73.90 +/- 1.99, and 80.95 +/- 0.47%, respectively. During heavy and maximal exercise, the diaphragmatic venous lactate concentration remained similar to the arterial concentration.(ABSTRACT TRUNCATED AT 250 WORDS)


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
L. E. Gosselin, D. Megirian, J. Rodman, D. Mueller, and G. A. Farkas
Respiratory muscle reserve in rats during heavy exercise
J Appl Physiol, October 1, 1997; 83(4): 1405 - 1405.
[Abstract] [Full Text] [PDF]


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