Interestingly enough, I stopped powerlifting about a year ago and the atrophy hasn't happened as quickly or as much as I thought it would. Now, I say that with the caveat that I have NO idea how big my muscles were when I was at my strongest (which is also when I was 300 pounds), but I still have 25+ pounds of muscle that I didn't have the last time I was the size I am now (scientifically deduced from being able to fit into the same pair of pants that I did when I was 180lbs, when I am now 205lbs). I currently have a knee injury that's keeping me from doing any lower body lifts, and am only doing upper body bodybuilding style stuff twice a week. I'm absolutely not as strong as I used to be, but I'm still muscular... although, again, don't know how much of that is a hold-over from my powerlifting heyday because at the time I was like a muscular manatee... couldn't see the muscles for all the blubber on top.

[edit] 5'11", about 1.80 meters