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The researchers, who reported their findings in the Canadian Journal of Cardiology, say previous studies have found that many sports competitors show signs of injury to the heart muscle and cardiac abnormalities after they exercise for long periods of time.The new study was created to assess the degree to which running a marathon stresses the heart, and whether it might cause permanent damage.As such, the researchers studied 20 amateur long-distance runners between the ages of 18 and 60, who were going to run in the Quebec City Marathon.