title: Effect of chronic exercise on myocardial function.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D006332:Cardiomegaly / Q000209:etiology; D005260:Female; D006321:Heart / Q000502:physiology*; D009929:Organ Size; D005082:Physical Exertion; D051381:Rats; D013550:Swimming