I'm still working on my power-style squat form (using a box). The other day I decided to load up to heavy (for me) weight and give it a shot.
I handled 210 pounds...the poundage I was previously stuck at for 5 reps in the olympic style...without a problem and loaded to 225. (Two plates a side...I'm finally getting somewhere!) I knocked out five reps nice and smoothly.
This morning I woke up and my lower back, while not in direct pain, is sore and stiff as a board; my hams and glutes, on the other hand, don't feel worked at all. I'm aware that soreness does not necessarily mean a muscle has been worked; however, as I had not been using my hams and glutes much in my olympic-style squats, I'd figure they'd feel something.
Since the soreness is primarily lower back, is it possible I'm having problems with my squat form? Or is this simply adaptation?