title: [Changes in the myofibrillary apparatus of the heart in early postnatal ontogenesis of rats in conditions of high altitude and physical exertion].
abstract: During postnatal development of rats under high-altitude conditions, the cardiac mass was enlarged as a result of cellular and intracellular hyperplastic processes. Under additional physical exercise the enlargement of the myocardial mass in high-altitude conditions resulted from the hypertrophy of muscle cells, i.e. from intracellular hyperplastic processes. The correlation between these two ways of the cardiac mass enlargement depends on the animals' age and the period of stay in mountains.
mesh_terms: D000531:Altitude; D000818:Animals; D006321:Heart / Q000254:growth & development*; D009206:Myocardium / Q000166:cytology*; D009210:Myofibrils; D005082:Physical Exertion; D051381:Rats
vernacular_title: Izmeneiia miofibrilliarnogo apparata serdtsa v rannem postnatal'nom ontogeneze krys v usloviiakh vysokogor'ia i fizicheskikh nagruzok.