Considering the fact that one of the indicators of effects of hypoxia in pilots could be an altered speech we have analysed changes in uttering a sound (A) in our examinees, pilot-students, aged 21-23, under effects of hypoxia only, the associated effects of hypoxia and mental loading and under conditions of normal barometric pressure. In the frequency and three dimensional representation of the selected sound, there have been analysed frequency components, intensity, duration and quality of the sound. It has been found that acute hypoxia causes deep structural and durational changes. During the stay at the simulated altitude the contributing factor to these changes which should be taken into account is the mental loading--performance of the test. It has been obvious that the same degree of hypoxia associated with mental activities during test performance causes deeper degradation of the voice structure both in the resistant subjects, and especially in individuals sensitive to the lack of oxygen compared to that under effects of hypoxia only and that under physiologic conditions.
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