[On the contractile function of the myocardium in middle-aged and elderly persons].
D000368:Aged; D002302:Cardiac Output; D002306:Cardiac Volume; D006321:Heart / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D009119:Muscle Contraction; D005082:Physical Exertion
O sokratitel'noĭ funktsii miokarda u lits pozhilogo vozrasta.