Chronic exercise prevents characteristic age-related changes in rat cardiac contraction.
D000375:Aging; D000818:Animals; D006321:Heart / Q000254:growth & development*; D008297:Male; D009200:Myocardial Contraction; D009929:Organ Size; D005082:Physical Exertion; D051381:Rats; D011919:Rats, Inbred Strains