声帯振動状態の定量的観測 : 正常者における超高速度映画による研究

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Vocal fold vibration of three normal male adults was quantitatively measured with the use of ultra-high-speed cinematography. The parameters measured were fundamental period, glottal area, cpen quotient, speed index, and amplitude and speed of horizontal excursion of the edge of the vocal fold. In order to investigate cycle-tc-cycle variations of vibratory pattern, mean value, range, standard deviation and coefficient of variation of twenty successive cycles were calculated for each parameter.The results are as follows: (1) The mean value of the fundamental period was 8.10, 7.63 and 8.41 msec, respectively. The coefficient of variation was 2.47, 1.97 and 3.33%. (2) Glottal area, measured in an arbitrary unit, showed a coefficient of variation of less than 9% in all the subjects. (3) Open quotient (OQ) and speed index (SI) varied from subject to subject, presumably depending on the interaction of the glottal adjustment and expiratory force. However, the standard deviation of OQ was less than 0.03, the coefficient of variation of OQ was less than 5%, and the standard deviation of SI was less than 0.1 in all the subjects. (4) The maximum amplitude of horizontal excursion was approximately from 1 to 1.5mm. The coefficient of variation was less than 3.5% in all the subjects. (5) The speed of horizontal excursion ranged from 0.4 to 0.8m/sec for opening, and from 0.2 to 0.8m/sec for closing. The coef ficient of variation was less than 8%. (6) The cycle-to-cycle variations of all the parameters in any subject presented no trend line but showed a random type of variation.
社団法人日本耳鼻咽喉科学会の論文

声帯振動状態の定量的観測 : 正常者における超高速度映画による研究

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