i know this has been of topic on and off so when i seen this article at the gym i swiped it up to post on here for you all.
couldnt copy and paste it in here so the link below is where it can be found..
http://www.acsm.org/health+fitness/p.../overtrain.pdf
for the matter is seems that acsm.org has quite a few interesting reads from their monthly articles if anyone wants to read them look under public information area on that site.