There are limits with high-intensity workouts, experts say

08/20/2013 | Dallas Morning News (free content), The

High-intensity workouts are getting attention, but fitness experts caution that, like medicine, there are dosage and frequency limitations for safety. Allen Jackson of the University of North Texas said four minutes at 90% of maximum heart rate is the highest range of intensity recommended by the American College of Sports Medicine, and no one should attempt that four minutes unless they have worked up to that extreme.

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Dallas Morning News (free content), The

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