| Different patterns of myometrial activity and 24-h rhythms in myometrial contractility in the gravid baboon during the second half of pregnancy. | |
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MedLine Citation:
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PMID: 1391314 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two clearly distinct epochs of myometrial contractility were observed in 13 pregnant baboons when recorded either as intraamniotic pressure (IAP) or myometrial electromyogram (EMG). Contractures, epochs lasting longer than 3 min, were the characteristic form of myometrial activity throughout pregnancy. Contractures generated only small increases in IAP. Short-lived contractions, generating larger increases in IAP, were characteristic of labor and delivery. Power spectral analysis of IAP and myometrial EMG activity proved to be an effective means whereby periods when the myometrium was in the contractures or contractions mode could be easily distinguished. Concomitantly recorded maternal intraabdominal temperature showed significant 24-h variations. When myometrial activity switched from low-amplitude, long-lasting regular contractures of pregnancy to contractions, the switch always occurred around the onset of darkness. Five baboons went into spontaneous labor, 3 prematurely and 2 at term. In these animals the switch from contractures to contractions occurred for several nights before delivery. The recurrence and timing of the switch from contractures to contractions for several nights before delivery were similar to the pattern we and others have observed in the pregnant rhesus monkey. The presence of 24-h periodicity in the patterns of specific types of myometrial activity in another nonhuman primate lends support to the view that similar 24-h patterns of myometrial activity may occur in pregnant women. |
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Authors:
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M A Morgan; S L Silavin; R A Wentworth; J P Figueroa; B O Honnebier; J I Fishburne; P W Nathanielsz |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Biology of reproduction Volume: 46 ISSN: 0006-3363 ISO Abbreviation: Biol. Reprod. Publication Date: 1992 Jun |
Date Detail:
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Created Date: 1992-11-05 Completed Date: 1992-11-05 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0207224 Medline TA: Biol Reprod Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1158-64 Citation Subset: IM |
Affiliation:
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Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center Oklahoma City 73190. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Circadian Rhythm* Female Labor, Obstetric / physiology Myometrium / physiology* Papio Pregnancy Time Factors Uterine Contraction / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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HD 21350/HD/NICHD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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