Effects of aging on the diurnal pattern of water intake in rats

Rebecca D. Burwell; Julia Whealin; Michela Gallagher

doi:10.1016/0163-1047(92)90468-J

Effects of aging on the diurnal pattern of water intake in rats

Rebecca D. Burwell, Julia Whealin, Michela Gallagher

Research output: Contribution to journal › Article › peer-review

Abstract

This study was undertaken to confirm previous findings that Long-Evans rats exhibit age-related changes in the diurnal/nocturnal distribution of water intake and to examine the circadian pattern of these age-related changes. Twenty-one aged and 10 young pathogen-free rats were continuously monitored for water consumption over 12:12 h light/dark cycles. ANOVA, profile analysis, and cosinor analysis each demonstrated that aged rats differed from young rats. The age-related changes in circadian pattern can be described as a blunted rhythm (decreased amplitude) and an altered timing of peak activity (advanced acrophase). These differences, however, were only apparent in a subset of aged rats with the remaining aged rats exhibiting a circadian pattern indistinguishable from that of the young group.

Original language	English (US)
Pages (from-to)	196-203
Number of pages	8
Journal	Behavioral and Neural Biology
Volume	58
Issue number	3
DOIs	https://doi.org/10.1016/0163-1047(92)90468-J
State	Published - Nov 1992
Externally published	Yes

ASJC Scopus subject areas

Physiology

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abstract = "This study was undertaken to confirm previous findings that Long-Evans rats exhibit age-related changes in the diurnal/nocturnal distribution of water intake and to examine the circadian pattern of these age-related changes. Twenty-one aged and 10 young pathogen-free rats were continuously monitored for water consumption over 12:12 h light/dark cycles. ANOVA, profile analysis, and cosinor analysis each demonstrated that aged rats differed from young rats. The age-related changes in circadian pattern can be described as a blunted rhythm (decreased amplitude) and an altered timing of peak activity (advanced acrophase). These differences, however, were only apparent in a subset of aged rats with the remaining aged rats exhibiting a circadian pattern indistinguishable from that of the young group.",

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