Arthritis Trips Up Middle-Age Fitness Buffs Study finds that most ardent runners most likely to suffer knee damage By Kevin Spak, Newser Staff Posted Nov 30, 2009 11:29 AM CST 1 comment Comments A man runs the Kern River Trail in this file photo. (Shutterstock) (Newser) – A new study shows that lots of exercise isn’t always good for you—at least not if you want to avoid arthritis. Following more than 200 people aged 45 to 55, the study found that the most ardent exercisers—those who worked out several hours a week—were the most likely to suffer knee damage as compared to their low- and moderate-activity counterparts, particularly if their drug of choice was running or jumping. That puts them at a higher risk of developing arthritis, says a researcher. The Arthritis Research Campaign was quick to downplay the findings, notes the BBC. “We have known for years that certain high-impact sports and jobs are associated with an increased risk of osteoarthritis,” said a spokesman, “but for the vast majority of people exercise is good, not only for the cartilage but for total body health.” Researchers recommended non-weight-bearing exercises, like swimming or cycling.