[knarf]

For WHATEVER reason ... oxygen starvation

I've experienced the same thing a couple of times in my life, but admittedly, not from a standstill

[reed13k]

I know it’s what I was trying to say as well - you just posted it more succintly and a mere 8 seconds prior to me - thus my follow on post about the 8 seconds. Has to do with blood pooling in the legs because the veins are cut off by the pressure so no return flow.