[Effect of reduced physical activity on the skeletal muscle].
The musculus masseter has been studied in 12 bioptates of 19-24-year-old men after they have been operated on for correction of true progeny which results in a decreasing functional loading on the masticatory musculature. SDG activity, ratio of myons of various types, cross section area of muscle fibres, content ratio of the connective tissue layers, number of blood capillaries around the myons, relative volume of the submicroscopic structures of the muscle fiber have been estimated. Pronounced pathological disorders in the muscle are absent, it is connected with a gradual change in conditions of functioning and a prolonged time for adaptation. The first type myons ratio increases, comparing to that in the control, the number of the capillaries around the myons decreases, while the amount of the connective tissue grows large. Marked quantitative ultrastructural changes of the energy and contractile-myofibrillar apparatus take place.
D000328:Adult; D006801:Humans; D007103:Immobilization; D008297:Male; D009132:Muscles / Q000201:enzymology / Q000648:ultrastructure*; D013385:Succinate Dehydrogenase / Q000378:metabolism
D013385:Succinate Dehydrogenase
Vliianie ponizhennoĭ funktsional'noĭ nagruzki na skeletnuiu myshtsu.