title: Dissociation of estrous cycle and activity rhythm in rats.
abstract: When rats were kept in continuous light there was a time-lag between the onset of activity arrhythmia and that of persistent estrus. When animals showing both arrhythmias in continuous light were kept under a LD 21:3 photoperiod, the activity rhythm returned to normal but the estrous cycle did not.
mesh_terms: D000204:Activity Cycles / Q000528:radiation effects*; D000818:Animals; D002940:Circadian Rhythm / Q000528:radiation effects*; D004971:Estrus / Q000528:radiation effects*; D005260:Female; D008027:Light; D010507:Periodicity; D011247:Pregnancy; D051381:Rats; D011919:Rats, Inbred Strains