| Changing patterns of daily rhythmicity across reproductive states in diurnal female Nile grass rats (Arvicanthis niloticus). | |
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MedLine Citation:
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PMID: 19744504 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A suite of changes in circadian rhythms have been described in nocturnal rodents as females go through pregnancy and lactation, but there is no information on such patterns in diurnal species. As the challenges faced by these two groups of animals are somewhat different, we characterized changes in activity and core body temperature (T(b)) in female diurnal Nile grass rats (Arvicanthis niloticus) as they went through a series of reproductive states: virgin, pregnant, pregnant and lactating, lactating only, and post-weaning. The phase of neither rhythm varied, but the amplitude did. Females increased their overall levels of daily activity from early to late pregnancy, regardless of whether they were also lactating. The pattern of activity was less rhythmic during early than mid-lactation, in both non-pregnant and pregnant females, as a consequence of a decrease in daytime relative to nighttime activity. The T(b) rhythm amplitude dropped from mid-pregnancy through mid-lactation, and there were rises in T(b) troughs during the mid-light and mid-dark phases of the day, though pregnancy and lactation affected T(b) at these times in somewhat different ways. This study demonstrates that rhythms in diurnal grass rats change during pregnancy and lactation in different ways than those of nocturnal species that have been studied to date and that the effects of pregnancy and lactation are not additive in any simple way. |
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Authors:
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Jessica A Schrader; Erin J Walaszczyk; Laura Smale |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S. Date: 2009-09-08 |
Journal Detail:
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Title: Physiology & behavior Volume: 98 ISSN: 1873-507X ISO Abbreviation: Physiol. Behav. Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-11-10 Completed Date: 2010-01-27 Revised Date: 2011-03-03 |
Medline Journal Info:
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Nlm Unique ID: 0151504 Medline TA: Physiol Behav Country: United States |
Other Details:
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Languages: eng Pagination: 547-56 Citation Subset: IM |
Affiliation:
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Department of Zoology, Michigan State University, East Lansing, Michigan 48824, USA. stjohnj4@msu.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Temperature / physiology Circadian Rhythm / physiology* Female Male Motor Activity / physiology* Murinae / physiology* Nesting Behavior / physiology Pregnancy Reproduction / physiology* Video Recording / methods |
| Grant Support | |
ID/Acronym/Agency:
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R01 MH053433-13/MH/NIMH NIH HHS; R01-MH53433/MH/NIMH NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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