More commonly in weightlifting it is a poorly positioned front squat or clean rack which can mechanically choke off the carotids which cause syncope. I’ve seen lifters stand up an easy clean, in no obvious distress, and while getting set for the jerk just drop backwards, out like a light. The “rule” coaches should teach their athletes is if they feel at all light headed, dump the bar; better safe than sorry. (Although injuries from a syncope episode on the platform are rare, thankfully)Same thing that causes people to pass out (much less commonly) on big cleans.
Too long of a Valsalva maneuver, blood pressure drops, lifter passes out.
It happens a lot less in weightlifting because the lifts are much much faster.
But I've seen guys standing up out of the hole from a difficult clean and have to drop the bar from the front rack because they got light headed.
I've certainly gotten woozy.
Google reckons its a molecule very similar to testosterone (trenbolone)Tren?