Here’s a short post in reaction to something I read in the comments. Someone was frustrated about how his knees reacted badly to a session on a stationary bike but were okay on a real bike, out on the road. Which makes no sense at all, right?
After all, a bike is a bike is a bike. Right?
Ten years ago, before my experience with knee pain, I would have said reflexively, “Sure. No appreciable difference.”
But once you have knee pain ... well, I’m not so sure. Your knees in this state are more tender and more easily disturbed. You start to appreciate subtleties, slight differences between Activity A and Activity B that actually can matter.
Personally, I’ve noticed differences in how my knees react to riding a stationary bike versus a bike on the open road.
The stationary bike has certain advantages. It’s easier to control the force exerted. You can simulate an 18-mile stretch of easy, flat road if you want to. Hell, you can even spin backwards.
But what I find more interesting is that riding on the open road may have certain advantages too. It’s easier for my knees to ride hard on the road than on a stationary bike. Why? Maybe because I’m shifting my body around, moving on the seat more, slightly altering the way that my joints take the pedaling force. Or maybe because sometimes I’m slowing (or even stopping for traffic lights), other times accelerating. Or maybe because occasionally I’m standing up on my pedals. I don’t know.
Then there are the bike setups to consider. Chances are very good that your stationary bike and road bike aren’t configured exactly the same way, in terms of distance from seat to pedal, for example. Does that matter? If you’ve got great knees, probably not. If you don’t, it might.
Anyway, this is just my way of urging you to stop and think a bit if you’re doing two things that you think are basically the same and one bothers your knees and one doesn’t. Maybe they aren’t really the same. And maybe that slight difference is actually important.