I find that if I get the opportunity during the day to lie down and put up my feet, my leg muscles (what is left of them) ache. The more I do, the more they ache. It almost seems this is happening because of the process of replenishing them with blood causes at least some of this.
I don't seem to have this issue with my upper body. I think I will bring this issue up with my doctor next time I am there.