you can probably return to that altitude without problems as long as you are properly acclimatized. The concentration of oxygen at sea level is about 21% and the barometric pressure averages 760 mmHg.

Medically reviewed by Arno Kroner, DAOM Altitude sickness occurs when air pressure and oxygen levels are reduced at a higher ...

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Men who brave high altitudes to climb or hike are at an increased risk of infertility according to a new study. And, while the damage appears to be reversible, it could take months for their fertility ...

We asked Dr. Bernabe Abramor, one of 30 physicians who work on Aconcagua during the climbing season, about his work and how ...