ABHA

Daily Ascent Rate and Sleeping Altitude

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Daily ascent rate means a relatively “safe” sleeping altitude that trekkers and mountainee­rs may reach in a day, avoiding or minimizing the chances of developing acute mountain sickness (AMS), high altitude cerebral oedema (HACE), or high altitude pulmonary oedema (HAPE).

The rate is still debatable. Currently, the recommende­d rate ranges from 300 to 500m above 2,000-3,000m. That means, for example, a trekker starting from 3,500m may cross a high altitude pass taller than 5,000m in a day but shall descend to sleep at 3,800m. In my opinion, 1,500m climb in a day is too much for the body, especially, for a short distance. Climb slowly for high success and safety rate. Thrill seekers find fault with the principle: taller the destinatio­n, longer the trip, and therefore higher the cost. Neither all adventuris­ts acclimatiz­e at the same rate nor have the same fitness level.

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