title: [Productivity of the "athletic heart" in children].
mesh_terms: D000293:Adolescent; D002302:Cardiac Output; D002306:Cardiac Volume; D006332:Cardiomegaly / Q000503:physiopathology*; D002648:Child; D005080:Exercise Test; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D008297:Male; D013178:Sports Medicine
vernacular_title: Proizvoditel'nost' "sportivnogo serdtsa" u deteĭ.