What about marathoners -- and not only marathoners, but first-timers?
Surely, they must be asking for trouble, right?
A study of five men and five women (yes, small sample size) showed that:
High-impact forces during long-distance running are well tolerated even in marathon beginners and do not lead to clinically relevant cartilage loss.The researchers from Germany’s Freiburg University Hospital measured cartilage volume and thickness, using the very precise 3-D quantitative MRI, before the runner’s training began and immediately after the marathon. The small changes that were detected were not judged to be meaningful.
Incidentally, the subjects averaged 40 years of age, with a mean BMI of 25.9.
To be sure: running a marathon, especially if you’ve never done one before, can be disastrous for your knees. But the good news appears to be, with some sensible training, it doesn’t have to be. Running isn’t bad for your knees per se. Running dumb is what’s bad.