| Effects on fetal and maternal body temperatures of exposure of pregnant ewes to heat, cold, and exercise. | |
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MedLine Citation:
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PMID: 11796695 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We exposed Dorper-cross ewes at approximately 120-135 days of gestation to a hot (40 degrees C, 60% relative humidity) and a cold (4 degrees C, 90% relative humidity) environment and to treadmill exercise (2.1 km/h, 5 degrees gradient) and measured fetal lamb and ewe body temperatures using previously implanted abdominal radiotelemeters. When ewes were exposed to 2 h of heat or 30 min of exercise, body temperature rose less in the fetus than in the mother, such that the difference between fetal and maternal body temperature, on average 0.6 degrees C before the thermal stress, fell significantly by 0.54 +/- 0.06 degrees C (SE, n = 8) during heat exposure and by 0.21 +/- 0.08 degrees C (n = 7) during exercise. During 6 h of maternal exposure to cold, temperature fell significantly less in the fetus than in the ewe, and the difference between fetal and maternal body temperature rose to 1.16 +/- 0.26 degrees C (n = 9). Thermoregulatory strategies used by the pregnant ewe for thermoregulation during heat or cold exposure appear to protect the fetus from changes in its thermal environment. |
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Authors:
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Helen P Laburn; Alida Faurie; Kathleen Goelst; Duncan Mitchell |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 92 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2002 Feb |
Date Detail:
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Created Date: 2002-01-17 Completed Date: 2002-04-08 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 802-8 Citation Subset: IM |
Affiliation:
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Brain Function Research Unit, Department of Physiology, University of the Witwatersrand, Parktown 2193, South Africa. 057Helen@chiron.wits.ac.za |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Temperature* Cold Temperature* Female Fetus / physiology* Hot Temperature* Motor Activity / physiology* Pregnancy Pregnancy, Animal / physiology* Sheep / embryology Telemetry |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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