Well I probably don't lift as intensely as you, but a heavy set of deadlifts will absolutely stun me in a way no other exercise will; heavy breathing for a prolonged time after, much greater than average post-set mental haziness, trembling muscles, etc. It does help to keep track of your breathing; I do a long negative and try to take two breaths on the way down, then breath out just as I begin the next rep.
I once learned the hard way what happens when you don't breathe correctly; I held my breath too much during some heavy leg sets and ended up with a sudden and violent headache as a result. It didn't last long, but for a bit there I thought I was having a stroke.
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