[Effect of training on the structural-metabolic indicators in athletes' skeletal muscles].
Muscle biopsy samples were taken from m.vastus lateralis of ski-runners during the training season and 4 months after training (consisting presumably of aerobic exercises). Metabolic enzyme activities, fiber cross-sectional areas, capillary supply indices and parameters of oxygen uptake by intact mitochondria in skinned fibers were measured. Training did not induce any appreciable changes in the NADH-tetrazolium reductase activity, maximal oxygen uptake by mitochondria, mean fiber size or capillary density. At the same time, there were significant increases in the cytochrome c oxidase activity, respiratory control index and creatine-stimulated respiratory rate. The activities of alpha-glycerophosphate dehydrogenase, malate dehydrogenase and myoglobin peroxidase as well as the basal respiratory rate of mitochondria decreased as a result of training. The data obtained testify to the possibility of qualitative adaptations in the respiratory chain of mitochondria.
Nemirovskaia
T L
TL
Shenkman
B S
BS
Nekrasov
A N
AN
Kuznetsov
A V
AV
Saks
V A
VA
D000293:Adolescent; D004734:Energy Metabolism; D006801:Humans; D008931:Mitochondria, Muscle / Q000378:metabolism; D009132:Muscles / Q000033:anatomy & histology / Q000201:enzymology / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D010806:Physical Education and Training; D012865:Skiing
D010100:Oxygen
Vliianie trenirovki na strukturno-metabolicheskie pokazateli skeletnykhmyshts sportsmenov.