Whether you're skiing in Colorado, mountain biking in Utah, trekking in Nepal or hiking through Denali National Park, you need to drink a lot of water at high altitude compared to what you would normally drink at lower levels. Drinking too little water can quickly lead to dehydration at altitudes above 5, feet.
The International Society for Mountain Medicine defines high altitude as between 5, and 11, feet, very high altitude as between 11, and 18, feet, and extreme altitude as any height above that. The higher you go, the greater the effects on your body and the more important it is to stay hydrated. Humidity is lower at higher altitudes. Sweat evaporates quickly and you may not realize how much water you are losing through exertion.
The lower oxygen levels also make you breathe in and out faster and more deeply, so that you lose more water through respiration. According to the Wilderness Medical Society, you lose water through respiration at high altitude twice as quickly as you do at sea level. High altitude can also make you need to urinate more often and can blunt your thirst response, putting you at even greater risk of dehydration.
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