Dissociation of Persistent Estrus and a Free-Running Activity Cycle in Different Light Cycles
- 1 September 1978
- journal article
- research article
- Published by Oxford University Press (OUP) in Biology of Reproduction
- Vol. 19 (2) , 425-430
- https://doi.org/10.1095/biolreprod19.2.425
Abstract
Persistent estrus and free-running activity cycles of female albino rats have been shown in previous studies to develop in long photoperiods and non-24 h light cycles. In the present study, estrous cyclicity and running activity were monitored simultaneously in varying photoperiods (LD 12:12, 20:4, 22:2 and 23:1) and cycle lengths (22, 23, 24, 25 and 26.5 h). Contrary to expectations, there was no correlation between the induction of persistent estrus and a free-running activity cycle. The data support the notion that although estrous cyclicity and running activity are related, the controlling elements for these rhythms are separable.This publication has 2 references indexed in Scilit:
- Circadian organization of the estrous cycle of the golden hamster.Proceedings of the National Academy of Sciences, 1976
- Pituitary-Ovarian Function in Rats Exposed to Constant Light: A Chronological StudyEndocrinology, 1967