PMID: 6411577Jan 1, 1983Paper

Influence of age, strain and season on circadian periodicity of pituitary, gonadal and adrenal hormones in the serum of male laboratory rats

Hormone Research
C C WongA von zur Mühlen

Abstract

The influence of age, strain and season on the circadian pattern of serum levels of LH, FSH, prolactin androgens and corticosterone was studied in five groups of male laboratory rats. Significant 24-hour periodicity was observed for serum levels of corticosterone in all five groups, for androgen levels in four, for prolactin levels in three, for LH levels in two and for FSH levels in one group of rats. There were significant influences of age, strain and season on the temporal patterns and/or on 24-hour mean serum hormone levels. The results indicate that some of the disagreements on existence or nonexistence of circadian rhythms and on rhythm patterns in serum hormone levels may be explained by the fact that animals of different ages or strains had been used or that experiments were performed at different times of the year.

Citations

Oct 1, 1996·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·G W Peters-VollebergG J Speijers
Jan 1, 1989·Annals of the New York Academy of Sciences·B Robaire, S F Bayly
Sep 1, 1987·The American Journal of Anatomy·J E Anderson, J A Thliveris
Jan 1, 1988·Chronobiology International·M A VillanúaA I Esquifino
Aug 17, 2001·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·L C SolbergE Redei
Dec 22, 2019·Frontiers in Neuroendocrinology·Scott A Kinlein, Ilia N Karatsoreos

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