I highly advise against anything involving screwing with your circulation to the brain. Messing with your jugular vein is a BAD idea.
The hyperventilation is to overoxygenate your blood (and, as in my post, the crouching causes higher blood pressure). The sudden shift from high-oxygen, to no-oxygen in your system (combined with the sudden standing up, which decreases blood pressure) means that your brain, which has just had a whole lot of oxygen flood through it (and expects more) suddenly gets nothing and overcompensates.
Remember - your body only has outside absolutes. By this I mean, there is a minimum and a maximum for everything, but there's no absolute "normal". If you've got a lot of oxygen coming in, your body will expect this to continue, or to slow down. It doesn't expect there to suddenly be none.
As for the other important question, severe injury, coma or death - in all probability only if you screw with your bloodflow. Regular use of the hyperventilation methods will cause damage (neural cell death, or blood clots in your brain = not fun), but sparing use is okay. Not that I recommend using anything other than prescribed drugs for inducing unconsciousness (although that will prevent any of the suggested practices during the unconscious period, since it doesn't allow for lucidity).
As for times - dunno. Probably a few minutes. Being unconscious, for me, was like having no body. And apart from the fact that I fell on a coffee table, yes I was alright.
This post has been edited by Zahaqiel: May 16 2006, 05:37 AM
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The value of an individual is not numerically assignable. Given the individual's infinite capacity to affect change (for better or for worse), it follows that their value is just as infinite. Logically then, not only are all individuals of equal value, but all possible combinations and groupings of individuals are of equal value, and finally, no matter an individual's past actions, their capacity to affect positive change is not diminished.
The value of the individual is sacrosanct, but actions must be directed in an effort to affect positive change.
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