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@deleted
I am just guessing, but my guess is:
A squat puts a huge increase in intra abdominal pressure, which in turn increases thoracic pressure. This causes a slight reduction in atria filling leading to a temporary reduction in cardiac output. This causes a temporary minor reduction in BP sensed at the carotid bulb.
This leads to the standard faint response, a increase in peripheral resistance and then you recover.
In other words, learn to change your breathing pattern to adjust it.
When I’m not on a phone I’ll think this through properly.