We analyzed effects of aging on behavioral rhythms in the mouse showing senescence acceleration, SAMP8 strains. The free-running rhythms had longer free-running periods (τ) in SAMP8 than in the control strain (SAMR1). Drinking of melatonin promoted the adaptation to advanced LD in SAMR1 but not in SAMP8, although both strains exhibited melatonin MT1 and MT2 receptors. The present results suggest that melatonin promotes the adaptation to advanced LD cycles in normal aging mice. (C) 2000 Elsevier Science B.V.
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