Abstract

The circadian rhythms of hypothalamic norepinephrine (NE) and of circulating norepinephrine, epinephrine (E), corticosterone, aldosterone, and serotonin (5HT) were determined in group-housed and in individually housed male adult rats, adapted to a 12/12 light/dark cycle. After 5 weeks of individual housing, compared to group-housed animals, hypothalamic NE mesor decreased, while circulating NE, E, and corticosterone mesor increased. The circadian rhythms of aldosterone and 5HT were unaffected by individual housing.

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