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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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“While the circadian pattern appears to be robust to acute changes in glucocorticoids (e.g., Becker et al., 1985), chronic stressors can cause a flatter slope due to lower peak levels and higher nadir levels (Fulkerson & Tang, 1979; Lane, 2006).”
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Foldes, A., Donnelly, J., Maxwell, C. A., et al. (1985) · The Journal of Agricultural Science · doi:10.1017/s0021859600044087 · Cited by 1
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Physiological adaptations to acute stress in the ewe
Newman, R. E. (1995) · Research Online (University of Wollongong)
Maria, A. C. B. E. (2016) · Digital Library of Theses and Dissertations (Universidade de São Paulo) · doi:10.11606/t.10.2016.tde-16092015-115043 · Cited by 1
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Haller, J., & Kruk, M. R. (2001)
Kallman, M. J. (2015) · Springer eBooks · doi:10.1007/978-3-642-27728-3_27-1
Kallman, M. J. (2017) · Springer eBooks · doi:10.1007/978-3-642-27728-3_27-2
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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
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