title: Changes of beta-endorphin level in blood during prolonged exercise.
abstract: In 49 healthy subjects during 2 h exercise on bicycle ergometer four variants of changes of beta-endorphin level were observed: 1. an increase during first 30 min followed by a decreased below initial values; 2. biphasic increase (peak values at the 30th and 120th min); 3. increase only during the 2nd h of exercise; 4. decrease during the whole period of exercise. For trained subjects the most common was the biphasic increase, for untrained ones--the overall decrease.
authors.affiliation: Department of Sports Physiology, Tartu University, Estonia, U.S.S.R.
authors.forename: A
authors.initials: A
authors.lastname: Viru
authors.forename: Z
authors.initials: Z
authors.lastname: Tendzegolskis
authors.forename: T
authors.initials: T
authors.lastname: Smirnova
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000097:blood; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D008297:Male; D005082:Physical Exertion / Q000502:physiology*; D011863:Radioimmunoassay; D013997:Time Factors; D001615:beta-Endorphin / Q000097:blood*
chemical_list: D001615:beta-Endorphin; D000324:Adrenocorticotropic Hormone; D006854:Hydrocortisone