Opiate peptides stimulate the release of GH and PRL, and such changes have also been reported following physical exercise. To investigate opiate involvement in the exercise-induced release of these hormones, eight professional athletes were exercised to 80% of their maximal heart rate on a bicycle ergometer. This exercise alone induced an increase in circulating mean GH (basal to maximal level, 3.1 +/- 0.9 ng/ml-27.3 +/- 5.9 ng/ml) and mean PRL level (6.1 +/- 1.1 ng/ml-19.5 +/- 1.9 ng/ml). In...Expand abstract
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Naloxone inhibits exercise-induced release of PRL and GH in athletes.
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