Millions of Americans are at risk of a stroke if they exercise too hard, a study suggests.Researchers found people with carotid artery stenosis, estimated to affect five percent of the country, are at risk of suffering sudden clots in the brain from simple activities like a brisk walk, swimming or even Zumba.During strenuous exercise, plaque in major arteries can become dislodged and travel to the brain where it blocks a blood vessel — causing a stroke.
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