>>Is that hypoxia ?
Yes - by hyperventilating you get rid of carbon dioxide in your bloodstream (but don't store any more oxygen) - the presence of CO2 is what drives you to keep breathing usually, rather than low levels of oxygen.
By holding your breath, the oxygen levels can then fall while the CO2 level remains low so you don't feel the urge to breathe - then you black out.
By compressing the chest you probably also cause your heartrate to drop suddenly which further reduces blood supply (and oxygen) to the brain.
There is potential for 'the fainting game' to cause brain injury or death ( 5 or 6 deaths per year in the US - usually children who are alone so maybe habitual 'self fainters') in certain people and is thus very strongly discouraged by schools!
Edit: according to Wiki's article on the 'game' there are a few names out there for it...
"The Fainting Game, Riding a Rocket, Airplaning, America Dream Game, Black Out Game, Breath Play, Bum Rushing, California Choke, California Dreaming, California Headrush, California High, California Knockout, Choking Out, Cloud Nine, Dumbass Game, Dying game, Dream Game, Dreaming Game, Elevator, Flatline Game, Flat Liner, Flatliner Game, Funky Chicken, Harvey Wallbanger, Hyperventilation Game, Indian Headrush, Knockout Game, Pass-out Game, Passing Out Game, Natural High, Sleeper Hold, Space Cowboy, Space Monkey, Suffocation Game, Suffocation Roulette, Teen Choking Game, Rising Sun, High Riser, Tingling Game, Trip to Heaven, Rocket Ride and Speed Dreaming, Wall-Hit, Purple Dragon, Five second high"
Last edited by: Lygonos on Wed 14 Mar 12 at 14:02
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