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The circadian rhythm of serum corticosterone was assessed in rats entrained to a 12:12 LD cycle and treated with tricyclic imipramine (25 mg/kg/day) via osmotic pumps for a period of 14 days; urinary excretion of catecholamines, serotonin and their catabolites was also assessed. We observed that imipramine did not modify the phase position of the corticosterone rhythm but rather lowered the animal's responsiveness as shown by the lower peak of corticosterone at 2000 and by the smaller amplitude of its circadian rhythm; moreover imipramine had no effect on urinary excretion of catecholamines, serotonin and their catabolites during LD cycle.
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