By the way, doctor: Should I worry about this irregular heartbeat?

At 86, I’m still competitively racing frostbite dinghies. I’ve noticed that my 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?

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Ask the doctor: How do I handle conflicting advice about exercise?

Last year, I had an aortic dissection. My surgeon says not to do any cardio or resistance exercise and to keep my heart rate down. My cardiologist says I can do light cardio and resistance exercise but to watch my blood pressure. Whom should I believe?

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