期刊
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
卷 142, 期 4, 页码 389-396出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpa.2005.07.019
关键词
acrophase; blood pressure; circadian rhythm; Equus caballus; heart rate; locomotor activity; melatonin; Ovis aries; rectal temperature
资金
- NIMH NIH HHS [MH 066826] Funding Source: Medline
Daily or circadian oscillation has been documented in a variety of physiological and behavioral processes. Although individual variables have been studied in great detail, very few studies have been conducted oil the temporal relationships between the rhythms of different variables. It is not known whether the circadian pacemaker generates each and every rhythm individually or whether most rhythms are simply derived from a few clock-controlled rhythms. As a first step in elucidating this issue, 21 physiological variables were recorded simultaneously in horse and sheep. The results indicated that, in both species, different variables exhibit different degrees of daily rhythmicity and reach their daily peaks at different times of the day. The variables exhibiting strongest rhythmicity were locomotor activity, rectal temperature, and plasma concentrations of melatonin and glucose. Comparison of rhythmicity and acrophase in the various rhythms allowed inferences to be made about mechanisms of causation. (C) 2005 Elsevier Inc. All rights reserved.
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