持続発声中の呼気ガス,血液ガス変動に関する実験的研究
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概要
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The energy of phonation is supplied by expiration. Since the purpose of respiration is gas exchange, the phonatory function will be affected by this factor under certain conditions, such as sustained phonation with effort.In order to study this, two experiments were performed.(1) Measurement of the phonation time, sound pressure level, volume of expired air, FEO2 (fractional O2 concentration of expired air) and FECO2 (fractional CO2 conce of ntrationexpired air) during sustained phonation.(2) Mesurement of the PaO2 (arterial O2 etnsion), PaCO2 (arterial CO2 tension), pH, B. E. (Base Excess), HCO3- in the arterial blood during sustained phonation and during breath holding.The following results were obtained:(1) Continuous decrease of FEO2 and increase of FECO2 were observed during sustained phonation.(2) In the terminal stage of sustained phonation, the value of FECO2 was similar to PACO2 at the breaking point of breath holding.(3) In easy phonation, phonation time and maximum FECO2 as well as minimum FEO2 were correlated.In falsetto phonation, however, such a correlation was not obtained.(4) Decrease of PaO2 and increase of PaCO2 in the course of sustained phonation and breath holding.(5) At the same point after initiation, PaCO2 is higher and PaO2 is lower in sustained phonation than in breath holding.(6) In sustained phonation, B. E. was lower initially than at the terminal part of phonation, and sometimes HCO3- value was out of the "significance band". This result suggests that in addition to respiratory factor, metabolic factor might also function during sustained phonation.(7) Both in sustained phonation and in breath holding, alkalemia was present in the initial stage and acidemia in the terminal stage.The results of the present study show that the respiratory factor in terms of gas exchange, influence sustained phonation to some extent.
- 耳鼻咽喉科臨床学会の論文
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