Recently, endurance athletes and high altitude climbers have gained
access to commercially available, portable normobaric hypoxic
chambers. Intermittent exposures to hypoxia in these chambers may
elicit adaptations similar to those observed during acclimatization
to altitude. Manufactures of these systems purport that
intermittent exposures may elicit adaptations similar to those
observed in response to the hypoxia of high altitude, however there
have been no reports in the scientific literature that ventilatory
acclimatization or alterations in cerebrovascular dynamics occur
following repeated episodes in the portable chambers. intervention,
consisting of five consecutive overnight exposures to a simulated
altitude of 4300m, elicits perturbations in the acute
cerebrovascular and ventilatory responses to both hypoxia and
hypercapnia, which are similar to changes following chronic
altitude exposure. Individual variability to intermittent hypoxia
may have an impact on the rate at which the process of
acclimatization proceeds. The extent of physiological and
symptomatic responses to intermittent hypoxia are likely to be
associated with the severity of hypoxia as well as the length and
number of recurrent episodes of hypoxia.
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