Abstract
Adult ovariectomized hamsters which were implanted with Silastic capsules containing estradiol benzoate (EB), progesterone (P) or nothing (Blank) were exposed to prolonged constant light (LL) with free access to running wheels. Freerunning locomotor rhythms were recorded on an event recorder. Light energy levels averaged 12.2 uwatts/cm 2 or 48.3 Lux. Rhythm splitting occurred in 1 7 animals given EB, 5 7 given P and 5 11 Blank implanted animals. Altogether, 1 7 EB, 6 7 P and 8 11 Blank implanted animals showed some form of splitting or other rhythm anomaly such as desynchrony of endogenous oscillations. There was a high incidence ( 10 11 ) of animals showing an additional transient rhythmical component running across the split condition. The study supports the concept that a multi-oscillatory system normally generates a cohesive circadian behavioral rhythm. Estradiol appears to facilitate the synchrony of these oscillations.
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