Nice posts in reply to your question, Lasso!
Here's the motherlode:
http://www.adrsupport.org/forums/showthread.php?t=9283
I saw this as a problem in 2004, when I was recovering. My physical therapist was a...physical terrorist! He had me stretching so much, I injured my hamstrings!
So, take it easy. Slow and steady wins the race.