Good definition. How does that apply in a single training session though?
I thinking overtraining is thrown around way too much. I usually train for 1 1/2 - 2 hrs at a time. This 45 minutes and out idea is lame.
I believe it doesn't matters that much how long you train, as long as it doesn't becomes too extreme. Some guys do low volume, others do high and the same goes for rest time between sets. At the end of the day, all camps book progress for the simple fact that their training style matches their beliefs.
There's no overtraining in my book as long as you take the necessary time to recover. Because of this, I don't train every muscle with the same frequency, call it autoregulation.