HEALTH TOPICS 
Will exercising less vigorously fix my heart rhythm problem?
Q. I'm a fit 61-year-old who had bypass surgery 15 years ago. Recently, I've been having rapid heartbeats (what my doctor calls supraventricular tachycardia) during or just after vigorous exercise. Should I tone down my exercise?
A. First, congratulations on your commitment to staying physically fit.
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