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Cited by 16Circadian rhythm and melatoninSleep and Wakefulness ResearchHypothalamic control of reproductive hormones

Sex differences in the development of the motor activity circadian rhythm in rats under constant light

Díez-Noguera, A., Cambras, T.·1990·Physiology & Behavior
DOI 10.1016/0031-9384(90)90014-u
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Abstract

Differences between sexes in the maturation of the motor activity rhythm have been studied in rats (10 females and 7 males) born and raised under LL and isolated from the day of weaning. Motor activity data were registered every 30 minutes for 45 days after weaning. Periodogram analysis was applied to each animal data and the daily power spectra were calculated on the basis of the period, tau. The process of rhythm evolution was studied by means of an analysis of variance of a multivariant linear model, and by defining two mathematical functions that fit to the evolution of the total daily motor activity (TDMA) and the power content of the circadian harmonic (PCCH) through time: a sigmoidal function, which presents an inflexion was used for the study of the evolution of the PCCH values through time: and a gaussian function, which presents a minimum was used for the evolution of the TDMA values. Results indicate that males show more ultradian components than females just after weaning, and take a longer time to acquire the circadian harmonic as the main harmonic in the daily power spectrum. The acquisition of the circadian character is preceded by a decrease in the TDMA, in the case of the males and is followed by a decrease in TDMA in the case of the females. These results suggest sexual differences in the organization and maturation of the circadian system in rats.

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  • There is a prevalence of ultradian components in the rhythms of young rodents under both entrained and free-running conditions which disappears in the post-weaning and pubertal periods.

    “For example, multiple authors have commented that there is a prevalence of ultradian components in the rhythms of young rodents under both entrained and free-running conditions which disappears in the post-weaning and pubertal periods [26, 38, 52, 76, 85, 93].”

    From The neuroendocrine control of the circadian system: Adolescent chronotype (2012) · cites this paper as [52]

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Authors
Díez-Noguera, A., & Cambras, T.
Affiliations
Universitat de Barcelona (ES)
ORCID
Cambras, T.
Venue
Physiology & Behavior
Publisher
Elsevier BV
Published
1990-05
Volume
47
Issue
5
Pages
889-894
ISSN
0031-9384 (ISSN-L)
DOI
10.1016/0031-9384(90)90014-u
OpenAlex
W2017558582
Cited by
16
References
20
Citations by year
2025: 2 · 2022: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2014: 1 · 2013: 1 · 2012: 1
FWCI
0.26
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Physiology & Behavior (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Keywords
sex differences, circadian rhythm, motor activity, constant light, ultradian rhythms, rats
MeSH terms
Animals, Brain, Circadian Rhythm, Female, Light, Male, Motor Activity, Psychophysiology, Rats, Inbred Strains, Sex Differentiation, Social Environment, Rats

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