Here’s some more good news about Parkinson’s disease: the more you exercise, the less likely you are to develop it. This finding comes from a study involving more than 143,000 men and women in the United States who were followed for almost 10 years. At the study’s outset in 1992, the average age of the participants was 63. By the end of the study, 413 participants had been diagnosed with Parkinson’s but those who engaged in moderate to vigorous exercise (swimming, biking, aerobics) were 40 percent less likely to be affected. Those who exercised most did the equivalent of five to six hours of aerobics or three to four hours of lap swimming per week. The researchers from the Harvard School of Public Health said the more hours of exercise and the more vigorous it was proved more important than the type of activity. The study was reported at the 59th Annual Meeting of the American Academy of Neurology in Boston, April 28-May 5, 2007.