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Testing Ventilatory Acclimatization to High Altitude using the Hyperoxic Ventilatory Withdrawal Test

Testing the transient hypoxic ventilatory response (HVR) is the most common method utilized for assessing ventilatory acclimatization in the setting of high altitude ascent, as the peripheral chemoreceptors become sensitized to hypoxia with chronic exposure. However, this test requires sophisticated equipment (e.g., gas tanks, feedback controllers) that lacks portability, and may lead to participant discomfort while already hypoxic while at altitude. The transient hyperoxic withdrawal (HVW) test is simple, portable and safe, using a small 100% O2 tank available on most expeditions, and may better assess ventilatory acclimatization when participants are chronically hypoxic in high altitude fieldwork studies. We hypothesized that the HVW would be larger following 7‐days of ascent to 4240m while taking acetazolamide (Diamox; i.e., ventilatory stimulant) than an acute hypoxic control group at low altitude, thus having utility in detecting ventilatory acclimatization during ascent to high altitude.