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  • Title: Assessment of plasma opioid peptides, beta-endorphin and met-enkephalin, at the end of an international nordic ski race.
    Author: Mougin C, Baulay A, Henriet MT, Haton D, Jacquier MC, Turnill D, Berthelay S, Gaillard RC.
    Journal: Eur J Appl Physiol Occup Physiol; 1987; 56(3):281-6. PubMed ID: 2952498.
    Abstract:
    Plasma met-enkephalin, beta-endorphin, cortisol and lactic acid concentrations were measured in seventeen volunteer male subjects at rest and after a long-distance nordic ski race. Immediately after the race, mean plasma met-enkephalin did not show any significant change, but significant rises in beta-endorphin, cortisol and lactic acid were noted in all skiers. The change in beta-endorphin with exercise was significantly related to the change in cortisol (r = 0.68; p less than 0.001) and to the change in plasma lactic acid (r = 0.60; p less than 0.001). Furthermore, the experienced skiers training over 150 km X week-1 of nordic ski had significantly faster skiing times in this event and showed greater beta-endorphin, cortisol and lactic acid levels than the recreational skiers who trained for 20 km X week-1. Our results imply that the changes in plasma beta-endorphin depend on the intensity of exercise. However the significance of higher levels of skiing training or previous nordic ski experience in the release of beta-endorphin is expected and cannot be excluded.
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