title: Exercise-induced catabolic responses in various muscle fibres.
abstract: In Wistar rats a 10-hr swim caused an immediate increase of 3-methylhistidine and free tyrosine content in the white portion of quadriceps muscle. In the red portion the elevated levels of these amino acids were observed within 6 to 48 hrs of postexercise recovery. The glycogen depletion was substantially higher in the red portion of the muscle, indicating that the most active were oxidative-glycolytic fibres during the exercise. In conclusion, during exercise the most active muscle fibres do not contribute to the mobilization of protein resources. In a later part of postexercise recovery, catabolic changes occur in most active fibres, constituting, reasonably, a part of enhanced protein turnover.
authors.affiliation: Laboratory of Hormonal Regulation of Muscular Activity, Tartu University, Ylikooli, Estonia.
authors.forename: E
authors.initials: E
authors.lastname: Varrik
authors.forename: A
authors.initials: A
authors.lastname: Viru
authors.forename: V
authors.initials: V
authors.lastname: Oöpik
authors.forename: M
authors.initials: M
authors.lastname: Viru
mesh_terms: D000818:Animals; D006003:Glycogen / Q000032:analysis; D008112:Liver Glycogen / Q000032:analysis; D008762:Methylhistidines / Q000032:analysis; D009124:Muscle Proteins / Q000032:analysis; D009132:Muscles / Q000737:chemistry / Q000378:metabolism*; D005082:Physical Exertion / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D013550:Swimming
chemical_list: D008112:Liver Glycogen; D008762:Methylhistidines; D009124:Muscle Proteins; D006003:Glycogen; C028118:3-methylhistidine