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ULTRADIAN AND CIRCADIAN RHYTHMS IN THE PLASMA CONCENTRATION OF CORTISOL IN SHEEP
Abstract
Three Merino ewes, adapted for about 3 weeks to their environment, were bled at 10 min intervals through a jugular venous cannula. Radioimmunoassay of plasma samples for cortisol revealed marked diurnal variations with peak levels just after midnight and lowest values in the afternoon. This rhythm appeared to result from a changing amplitude associated with a distinct ultradian rhythm (frequency 0·8–1·2 cycles/h) in the plasma level of cortisol. Calculation of the daily rate of secretion of cortisol from the hormone profiles gave a mean value of 8·49 mg. Arguments are put forward in favour of this method for obtaining the true rate of secretion of cortisol.
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“Several physiological systems exhibit ultradian rhythms (URs) in the 1–3 h range, including the HPG axis60–65, the HPA axis66–72, and the suprachiasmatic nucleus73, 74 – the principal orchestrating brain area for circadian rhythms.”
From Maternal and Early-Life Circadian Disruption Have Long-Lasting Negative Consequences on Offspring Development and Adult Behavior in Mice (2017) · cites this paper as [67]
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“Instead, previous studies have identified at most an ultradian rhythm with a concentration minimum in the morning (Fulkerson and Tang, 1979) and a possible effect of stress (Przekop et al.”
Background
Metadata
- Authors
- FULKERSON, W. J., & TANG, B. Y.
- Venue
- Journal of Endocrinology
- Publisher
- Bioscientifica
- Published
- 1979-04-01
- Volume
- 81
- Issue
- 1
- Pages
- 135-141
- ISSN
- 0022-0795 (ISSN-L)
- 1479-6805
- OpenAlex
- W2039679866
- Cited by
- 115
- References
- 0
- Citations by year
- 2026: 1 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 2 · 2017: 5 · 2016: 5 · 2015: 4 · 2014: 2 · 2013: 1 · 2012: 2
- FWCI
- 2.98
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Endocrinology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
- Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Keywords
- ultradian rhythms, circadian rhythm, cortisol, diurnal variation, cortisol secretion rate, Merino ewes, sheep, radioimmunoassay
- MeSH terms
- Animals, Circadian Rhythm, Female, Hydrocortisone, Periodicity, Radioimmunoassay, Sheep
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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