Very good discussion in here.
I will pipe in by saying that I am currently taking 2 weeks off from any movements that require my lower back to bare a load. The reason being that heavy front squats, back squats and RDLs one day and deadlifts, pendlay rows, and heavy shrugs another day, along with OHP on a completely other day has brought me to the point where my spinae erector is completely fatigued.
This isn't an injury, necessarily. And my performance on my deadlift as decreased significantly.
I would say, my lower back or spinae erector is either under recovered or over trained.
My point here is that overtraining does exist in one form or another.
However I agree with you guys when you say the term over training is often misused and over used in the forums.
Zdravko Veselin Gaeta
I am not a powerlifter nor am I a bodybuilder. I just want to be big and strong.
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Make gains, not excuses.