Laryngeal Narrowing Measured with Low Frequency Sound

Tamotsu Takishima, Shunsuke Suzuki, Kiyohisa Sekizawa, Yoshio Hirose, Hidetada Sasaki, Masaharu Sugiyama, Yoshio Shimizu, Yoshinoei Akaizawa, Chiyohiko Shindo

Research output: Contribution to journalArticlepeer-review


Takishima, T., Suzuki, S., Sekizawa, K., Hirose, Y., Sasaki, H., Sugiyama, M., Shimizu, Y., Akaizawa, Y. and Shindo, C. Laryngeal Narrowing Measured with Low Frequency Sound. Tohoku J. exp. Med., 1982, 137 (4), 463-464- We measured laryngeal resistance with 800 Hz sound in human subjects. 800 Hz sound was forced into the mouth and the intensities of sound above and below vocal cord were detected by two microphones on the anterior neck. Respiratory-resistance (Rrs) was simultaneously measured by an oscillation method. When the subject voluntarily controlled the glottis aperture at functional residual capacity, the percent increase of difference of intensity of sound between two microphones (Y %) was curvilinearly proportional to the increase of Rrs (X) from the control state; Y=20.8xX1.24. Since Rrs below the larynx was constant at a given lung volume, we could estimate the increase of laryngeal resistance from the control state by knowing the percent increase of difference of intensity of sound. The present method would be clinically applicable to measure Rrs independent from laryngeal artifact.–––– laryngeal resistance; microphone.

Original languageEnglish
Pages (from-to)463-464
Number of pages2
Journalthe tohoku journal of experimental medicine
Issue number4
Publication statusPublished - 1982 Jan

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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