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Andeans

It has been found that the ventilatory response is substantially less pronounced in the Andean populations than that of the Tibetans, with the HVR response of Tibetans roughly double that of Andeans at an altitude of around 4000 meters. The altitude adaptations also appear to be less permanent than those in the Tibetan populations, as the Andeans have a much higher prevalence of Chronic Mountain Sickness (CMS), where the body develops a harmful reaction to low oxygen levels over man years.