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


     

J Appl Physiol 73: 234-239, 1992;
8750-7587/92 $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 Jones, M. T.
Right arrow Articles by Robertshaw, D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Jones, M. T.
Right arrow Articles by Robertshaw, D.

Journal of Applied Physiology, Vol 73, Issue 1 234-239, Copyright © 1992 by American Physiological Society

ARTICLES

Determination of maximal oxygen consumption in exercising pregnant sheep

M. T. Jones, R. E. Rawson and D. Robertshaw
Department of Physiology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853.

Previous work with pregnant ewes has shown that acute bouts of exercise may cause changes in plasma hormone concentrations, blood flow distribution, and maternal and fetal temperatures. However, most of these studies do not quantify the chosen exercise intensity through measurement of oxygen consumption (VO2). Therefore the purpose of this study was to statistically model the VO2 response of pregnant sheep to treadmill (TM) exercise to determine the exercise intensities (% maximal VO2) of previous studies. Ewes with either single (n = 9) or twin (n = 5) fetuses were studied from 100 to 130 days of gestation. After 1-2 wk of TM habituation, maximal VO2 (VO2max) was determined by measurements of VO2 (open flow-through method) and blood lactate concentration. VO2 was measured as a function of TM incline (0, 3, 5, and 7 degree) and speed (0.8-3.4 m/s). VO2max averaged 57 +/- 7 (SD) ml.min-1.kg-1, and peak lactate concentration during exercise averaged 22 +/- 2 mmol/l. The relationship between VO2 (ml.min-1.kg-1) and incline (INC) and speed (SP) [VO2 = 0.70(INC) + 13.95(SP) + 1.07(INC x SP) - 1.18] was linear (r2 = 0.94). Our findings suggest that most previous research used exercise intensities less than 60% VO2max and indicate the need for further research that examines the effect of exercise during pregnancy at levels greater than 60% VO2max.


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
P. L. Entin, D. Robertshaw, and R. E. Rawson
Effect of locomotor respiratory coupling on respiratory evaporative heat loss in the sheep
J Appl Physiol, November 1, 1999; 87(5): 1887 - 1893.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
P. L. Entin, D. Robertshaw, and R. E. Rawson
Thermal drive contributes to hyperventilation during exercise in sheep
J Appl Physiol, July 1, 1998; 85(1): 318 - 325.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
R. E. Rawson, P. W. Concannon, P. J. Roberts, and B. C. Tennant
Seasonal differences in resting oxygen consumption, respiratory quotient, and free thyroxine in woodchucks
Am J Physiol Regulatory Integrative Comp Physiol, April 1, 1998; 274(4): R963 - R969.
[Abstract] [Full Text] [PDF]


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