Originally Posted by
Ka6crpe
Lost in Saigon, Unless you have been trained in high altitude breathing then even if you are receiving oxygen, you still wont be able to breathe. At high altitude you must consciously inhale and exhale, there is insufficient air pressure for your body to exhale automatically.
Think of the acclimatisation periods required by climbers ascending Everest, they are training their bodies to breathe with reduced air pressure.
If what you say is true, why are airliners required to have passenger oxygen?