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  2. Effects of high altitude on humans - Wikipedia

    en.wikipedia.org/wiki/Effects_of_high_altitude...

    The effects of high altitude on humans are mostly the consequences of reduced partial pressure of oxygen in the atmosphere. The medical problems that are direct consequence of high altitude are caused by the low inspired partial pressure of oxygen, which is caused by the reduced atmospheric pressure, and the constant gas fraction of oxygen in ...

  3. Armstrong limit - Wikipedia

    en.wikipedia.org/wiki/Armstrong_limit

    If the user does not wear a pressure suit or a counter-pressure garment that restricts the movement of their chest, the high-pressure air can cause damage to the lungs. For modern military aircraft such as the United States' F‑22 and F‑35 , both of which have operational altitudes of 18,000 m (59,000 ft) or more, the pilot wears a "counter ...

  4. Dysbarism - Wikipedia

    en.wikipedia.org/wiki/Dysbarism

    Gas is very compressible. Humans have many air spaces: sinuses, middle ears, gas in the gastro-intestinal tract, cavities in the teeth, and largest of all, the lungs. On land in dail life, the pressure in these air spaces is usually exactly the same as the pressure outside, because the air spaces are connected to the outside world.

  5. Altitude sickness - Wikipedia

    en.wikipedia.org/wiki/Altitude_sickness

    Once above approximately 3,000 metres (10,000 ft) – a pressure of 70 kilopascals (0.69 atm) – most climbers and high-altitude trekkers take the "climb-high, sleep-low" approach. For high-altitude climbers, a typical acclimatization regimen might be to stay a few days at a base camp , climb up to a higher camp (slowly), and then return to ...

  6. Aerospace physiology - Wikipedia

    en.wikipedia.org/wiki/Aerospace_physiology

    The physics that affect the body in the sky or in space are different from the ground. For example, barometric pressure is different at different heights. At sea level barometric pressure is 760 mmHg; at 3,048 m above sea level, barometric pressure is 523 mmHg, and at 15,240 m, the barometric pressure is 87 mmHg.

  7. High-altitude pulmonary edema - Wikipedia

    en.wikipedia.org/wiki/High-altitude_pulmonary_edema

    High-altitude pulmonary edema (HAPE) is a life-threatening form of non-cardiogenic pulmonary edema that occurs in otherwise healthy people at altitudes typically above 2,500 meters (8,200 ft). [2] HAPE is a severe presentation of altitude sickness. Cases have also been reported between 1,500–2,500 metres or 4,900–8,200 feet in people who ...