高地(低圧,低酸素環境下)における発声持続時間

概要

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Measurement of the maximum phonation time is a very simple method for evaluating some aspects of phonetic function, and it is generally accepted that the duration depends on glottic, subglottic, and supraglottic conditions. However, as phonation takes place at expiration, which is part of respiration, the maximum phonation time may also depend on PaO2 and PaCO2 in special conditions such as in high altitudes where atomospheric pressure and, in turn, alveolar oxygen pressure are low.In order to study this, maximum phonation time, breath holding time, and vital capacity were measured at Mt. Tsurugi in Japan and at Mt. Kolahoi in India in several subjects and compared with those in the normal atomospheric enviroment.The maximum phonation time and breath holding time decreased as the altitude became higher, and as the term of stay became longer, while FVC and FEV1.0% did not change remarkably.The authors suspected that the mechanism of the phenomenon originated from (1) low PaO2 due to low PAO2, (2) low PaCO2 due to hyperventilation, and (3) alkalosis due to low PaCO2.
耳鼻咽喉科臨床学会の論文