Expando-Quads?

[marni]

I love my zoots tights and wear them a lot= Thank goodness for the ac!they definitely help me avoid next day aches and stiffness.

[WindingRoad]

I have the big quad thing going on too. I'm pretty mine has a direct link to the new hilly terrain I'm in though, LOL. I have a 3 mile commute (one way), three miles, that's it! Of course there really isn't a flat spot on it and on the way home there is a monster climb. I have been working on staying standing the whole way up it. Wednesday was the first day I got close! Dang with all my stuff in my panniers I'm barely able to carry the bike down the stairs in the morning. I think this may be my new quad issue.

[OakLeaf]

I always thought it was mechanical, not biochemical - a process that winds up as compartment syndrome ("arm pump" etc.) in extreme cases. Repeated hard contractions making the muscle get kind of "stuck" in its hard, flexed position. It's not burned glycogen that turns your biceps into a tennis ball when you're showing off in the mirror...