title: Ask the doctor. I know that exercise is good for my heart, which is one reason why I took up long-distance running. But I have heard that marathon running damages the heart. Is that true?
authors.forename: Thomas
authors.initials: T
authors.lastname: Lee
mesh_terms: D052279:Creatine Kinase, MB Form / Q000097:blood; D006321:Heart / Q000502:physiology*; D006801:Humans; D018482:Muscle, Skeletal / Q000378:metabolism; D009206:Myocardium / Q000378:metabolism; D012420:Running / Q000502:physiology*; D020107:Troponin T / Q000097:blood
chemical_list: D020107:Troponin T; D052279:Creatine Kinase, MB Form