Editing Altitude sickness (section)

=== High altitude ===
At high altitude, {{convert|1500|to|3500|m|ft}}, the onset of physiological effects of diminished inspiratory oxygen pressure (PiO<sub>2</sub>) includes decreased exercise performance and increased ventilation (lower arterial [[partial pressure of carbon dioxide]]: PCO<sub>2</sub>). While arterial oxygen transport may be only slightly impaired the [[Oxygen saturation (medicine)|arterial oxygen saturation]] (SaO<sub>2</sub>) generally stays above 90%. Altitude sickness is common between {{convert|2400|and|4000|m|ft}} because of the large number of people who ascend rapidly to these altitudes.<ref name="Auerbach 2007">{{cite book |vauthors=Auerbach P |author-link=Paul Auerbach |title=Wilderness Medicine |publisher=Mosby Elsevier |edition=5th |year=2007 |isbn=978-0-323-03228-5 |ref=Auer07}}</ref>