title: By the way, doctor. At 86, I'm still competitively racing frostbite dinghies for about two hours once a week, but only in light winds. I've noticed that my usually regular heartbeat becomes irregular during the races and for hours afterward. It feels like a weak beat after every two normal heartbeats. Is this a normal exercise reaction?
authors.forename: Thomas H
authors.initials: TH
authors.lastname: Lee
mesh_terms: D000369:Aged, 80 and over; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D006801:Humans; D005082:Physical Exertion / Q000502:physiology*; D013177:Sports / Q000502:physiology*