Document Detail

Determination of maximal oxygen consumption in exercising pregnant sheep.
MedLine Citation:
PMID:  1506375     Owner:  NLM     Status:  MEDLINE    
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), and peak lactate concentration during exercise averaged 22 +/- 2 mmol/l. The relationship between VO2 ( 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.
M T Jones; R E Rawson; D Robertshaw
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  73     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1992 Jul 
Date Detail:
Created Date:  1992-09-21     Completed Date:  1992-09-21     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  234-9     Citation Subset:  IM    
Department of Physiology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853.
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MeSH Terms
Lactates / blood
Methane / metabolism
Oxygen / blood
Oxygen Consumption / physiology*
Physical Exertion / physiology*
Pregnancy, Animal / metabolism*
Grant Support
Reg. No./Substance:
0/Lactates; 74-82-8/Methane; 7782-44-7/Oxygen

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