title: [Effect of exhaustive weightlifting exercise on EMG, biochemical markers of muscle damage and performance capacity in young male subjects].
abstract: The aim of this study was to examine the effect of exhaustive weightlifting exercise on electrical and biochemical variables and performance capacity in young male subjects. The onset of exercise (80-50% 1RM) was associated with a decrease in the amount of work performed, which was followed by a steady performance capacity at 40-10% 1RM. There were no significant changes of m. rectus femoris EMG maximal amplitude though it tended to be increased during the first half of exercise. A significant blood lactate concentration increase indicated that an anaerobic metabolism was a predominant mechanism of muscle contraction energy-supply. CK level in blood plasma did not change but plasma myoglobin concentration doubled immediately post-exercise. The data presented here suggest that decrease in performance capacity was likely due to progressive "refusal of work" of the fast motor units and work prolongation of weaker, intermediate and slow motor units. Unchangeable CK activity and relatively small increase in myoglobin concentration in plasma suggest that used weightlifting exercise did not induced substantial damage in myocytes' membranes in our subjects.
authors: A D
authors: AD
authors: Minigalin
authors: A R
authors: AR
authors: Shumakov
authors: A V
authors: AV
authors: Novozhilov
authors: A V
authors: AV
authors: Samsonova
authors: E A
authors: EA
authors: Kos'mina
authors: M I
authors: MI
authors: Kalinskiĭ
authors: T I
authors: TI
authors: Baranova
authors: I V
authors: IV
authors: Kubasov
authors: V I
authors: VI
authors: Morozov
mesh_terms: D000328:Adult; D001265:Athletic Injuries / Q000097:blood / Q000503:physiopathology; D004576:Electromyography; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D018482:Muscle, Skeletal / Q000293:injuries / Q000503:physiopathology; D009211:Myoglobin / Q000097:blood*; D014891:Weight Lifting
chemical_list: D009211:Myoglobin; D019344:Lactic Acid