Know Your Limits
How much running can compromise your immune system to the point of making you sick? For average runners, the dividing line seems to be 60 miles a week, according to David Nieman, Ph.D., of the Human Performance Laboratory at Appalachian State University. Nieman conducted the largest study ever done on this question by examining 2,300 runners who competed in the 1987 Los Angeles Marathon. "The odds of getting sick were six times higher than normal after the marathon," says Nieman, "and those who ran 60 miles a week or more doubled their chance of getting sick." The illnesses were of the upper respiratory tract, including sinus infections. Nieman says there's no doubt these findings are still applicable to runners today. He's also used himself as a test case: When Nieman trained up to 90 miles a week, he constantly battled sore throats. When he dropped his weekly mileage below 60, the symptoms stopped.
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