Circadian Oscillations in Rodents: A Systematic Increase of Their Frequency with Age

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Science  08 Nov 1974:
Vol. 186, Issue 4163, pp. 548-550
DOI: 10.1126/science.186.4163.548


The circadian activity rhythms of golden hamsters and two species of deermouse, when released from a light-dark cycle of 12 hours light and 12 hours of darkness into constant darkness, had progressively shorter periods as the animals became older. A possible bearing of this fact on the aging process is briefly outlined.