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Exercising Too Much (or Too Little) Can Harm Your Knees

Whether you’re training for a marathon or barely getting off the couch after work, you could be doing a real number on your knees. Both intense exercise and a lack of activity can speed up deterioration of middle-aged knees, say investigators from the University of California, San Francisco.

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The researchers used MRI scans to monitor changes in the right knee cartilage of 205 participants, age 45 to 65 years old, over a span of four years. The participants kept track of their physical activity with a questionnaire, and some used an accelerometer to track their exercise. The study found that people who participated in high-impact activities such as basketball, tennis and running had increased cartilage deterioration. But so did people who hardly exercised at all. The research suggests that moderate, low-impact exercise is best for protecting knee cartilage.

Cartilage deterioration is the hallmark of osteoarthritis (OA) a condition that affects 27 million Americans, according to the Arthritis Foundation. It causes bones to rub together, leading to stiffness and pain. Increasing age, obesity, joint injuries and weak thigh muscles all can increase the risk of OA.

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What You Can Do
The right kind of exercise, however, is key to preventing OA. If you’re at risk, consider these exercise changes to save your knees: