It's not so much that you shouldn't wear shoes at all, but running shoes/cross trainers are squishy and absorb impact. WHile squatting you want the force to transfer from your feet to the ground unfettered. No shoes are better than squishy shoes (at least that's the argument). However, many will say that stiff soled shoes are better than no shoes.
YEAH, bump for this. I've been wearing Nike Shox (running shoes with the big springs visible in the back) for about 2 years.
I oly squat, and I'm getting into Olympic weightlifting and power moves; should I be jogging to the gym in running shoes, changing into oly shoes for the olympic lifts, and then ANOTHER pair for powerlifting moves like squat, deadlift and bench pressing?
The thing about forces on shoes and blowouts is kinda like this:
If you are SLOWLY applying the force, like unracking 800lbs and squatting, a 200bber would be putting 500lbs of force or 2,225 Newtons through each shoe. This force would be distributed about 2/3 to the inflated heel and 1/3 to the solid toe end. So the total foce on the heel would be 1,480N.
If you jump up to do a slam dunk and land on one heel, you are falling on one heel with 200lbs and about a whole meter of acceleration = about 2,000N.
So the shoe is actually more than capable of handleing the weight from squatting so long as the integrity of the shoe is still good. If the shoe were old/damaged and blew out after a landing, you might fall over. If they blew out with 800lb, you may well splinter your spine!
Personally I use chucks when I back squat only. When I do cleans from the floor I use oly shoes. When I do hangcleans I use a cross training type shoe. When I deadlift I go barefoot. There is no best type of shoe for all lifts. Saying CHucks are better than Oly shoes is a ridiculous statement.
My shoxs were fine with 400lb ATF today - I do feel them flex when I unrack the weight and walk out with each step, but when I'm flat footed and ready to squat I don't feel them move.