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Can exercising too hard and too long cause heart problems?

from Minneapolis Star Tribune

Can exercising too hard and too long cause heart problems? Minneapolis Star Tribune In 2010, John Mandrola was 46 years old and training like a demon for the USA Cycling Masters Road National Championships when, out on a ride, his heart started beating erratically. He diagnosed it immediately, because, in addition to being an accomplished endurance athlete, Mandrola is also a cardiac electrophysiologist. READ MORE

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