Originally Posted by tommyrod74

I've seen it too, but I also see it among noncyclists who lift weights recreationally.

It's often hard (when trying) to add mass in your teens and 20's, add a few years, then boom! It is hard to keep mass off. Oddly, usually no stronger (or less so) than when younger.

Also, sometimes masters guys ride on the high intensity/low-ish volume plan due to work, family, etc., and high volume will definitely keep the weight off (muscle too).

And I'm sure some is doping-related as well.