Neuropeptide Y (NPY) and catecholamines are synthesized in response to stress. Adrenal NPY mRNA and tyrosine hydroxylase (TH) mRNA were measured by Northern analysis 2 h after a single 20 min bout of shaker stress in exercised and sedentary male Sprague–Dawley rats. Long-term exercise (18 weeks of voluntary wheel running) alone did not significantly alter adrenal NPY mRNA or TH mRNA levels. However, increases in stress-induced NPY and TH mRNA abundances were significantly enhanced by long-term exercise ( P <0.01). These results suggest that long-term physical activity may enhance the ability to synthesize NPY and catecholamines under conditions of stress.
Neuroscience Letters – Elsevier
Published: Feb 20, 1998
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