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Extreme Exercise Should Be Limited To 30- 50 Minutes A Day, Or It Can Be Harmful

November 29, 2012: 12:00 AM EST
U.S. cardiologists report that vigorous exercise is not necessarily the road to health that many avid runners claim. In fact, it can cause excessive wear-and-tear on the heart, unless it is limited to about 30 to 50 minutes a day. Longer periods of “chronic extreme exercise” – such as running marathons – induce adverse structural and electrical remodeling, “which offsets some of the cardiovascular benefits and longevity improvements conferred by moderate physical activity”, the doctors wrote. They noted that extreme exercise over the long term isn’t necessarily deadly, but it may wipe away many of the health advantages of regular moderate exercise.
J. H. O'Keefe et al., "Run for your life .. at a comfortable speed and not too far", Heart, November 29, 2012, © BMJ Publishing Group Ltd & British Cardiovascular Society
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