title: Studies reshape some views of the aging heart.
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D002302:Cardiac Output; D002395:Catecholamines / Q000378:metabolism; D004071:Digitalis Glycosides / Q000627:therapeutic use; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion
chemical_list: D002395:Catecholamines; D004071:Digitalis Glycosides