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Stress hormone activation. The hormones ACTH, corticosterone, and melatonin were quantified after a brief 2‐hr physical restraint stress. Compared to LRT rats, HRT rats displayed a significant increase in ACTH (a). A non‐significant reduction in Corticosterone levels was found in HRT rats relative to the LRT rats (b). Melatonin activation was not different between LRT and HRT rats (c)
