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


     

J Appl Physiol 50: 315-319, 1981;
8750-7587/81 $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 Maskrey, M.
Right arrow Articles by Fawcett, A. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Maskrey, M.
Right arrow Articles by Fawcett, A. A.

Journal of Applied Physiology, Vol 50, Issue 2 315-319, Copyright © 1981 by American Physiological Society

ARTICLES

Effect of a constant arterial CO2 tension on respiratory pattern in hear-stressed sheep

M. Maskrey, J. R. Hales and A. A. Fawcett

Sheep were exposed in a climate chamber to a hot humid environment under two conditions: breathing atmospheric air and breathing air enriched with CO2. Measurements were made of rectal temperature (Tre), respiratory frequency (fR), mean arterial pressure (BP), heart rate (fH), and arterial O2 tension (PO2), CO2 tension (PCO2), and pH; depth of breathing was also estimated. Tre increased at a similar rate under both conditions. When breathing air, sheep exhibited rapid shallow panting followed by slower deeper (second phase) breathing during which they became severely hypocapnic and alkalotic. When the sheep breathed CO2-enriched air at a rate allowing normocapnia to be maintained, fR was lower and the depth of breathing greater, but the sequence of changes in respiratory activity was similar to that with air breathing. BP, fH, and PO2 each increased to a similar extent under both conditions. It is concluded that the normal biphasic panting response to severe heat stress in sheep is largely independent of arterial PCO2.


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
D. Robertshaw
Mechanisms for the control of respiratory evaporative heat loss in panting animals
J Appl Physiol, August 1, 2006; 101(2): 664 - 668.
[Abstract] [Full Text] [PDF]


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