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Originally Posted by Razor
It sounds like the lifts that are causing you problems (squat, deadlift, overhead press) are also lifts where its common for a guy to really tense up his neck and shoulders during the lift. I've heard of folks (especially someone with giant traps and no neck, sound familiar?) being able to occlude bloodflow to the brain by tensing the neck and shoulders...I think Pappy Boyington did this during dogfights to keep the blood in his brainpan during high-G turns in WWII. You're breathing fine, but perhaps you're inadvertently closing off vessels in your neck for too long due to the higher # of reps per set than you're used to doing?
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This happened to a friend of mine quite a bit. He was about 5'9 and had some huge traps. Well, there were many of leg days when I had to pick his ass up of the floor from squats and a few times after he finished leg presses. I personally have come close to blacking out on legs many times. But I find that it's the weight I'm pushing (I'm going to my limit). Doing this with lighter reps and passing out doesn't sound familiar to me. If you are going heavy and this is happening, well; I've seen that more common. I second the others and say get checked out if you are just repping.