Vocal fold impact stress analysis

Jack J. Jiang, Anand G. Shah, Markus M. Hess, Katherine Verdolini, Franklin M. Banzali, David G. Hanson

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Vocal fold impact stress (force/area) has been implicated as a factor possibly contributing to the formation of nodules and polyps. The force of impact of a moving body is related to its acceleration. Since the mass of the folds is relatively constant, one expects impact force to be directly proportional to acceleration. A measure that reflects the relative displacement of the vocal folds is photoglottography (PGG). The velocity and acceleration of the folds are easily obtained by calculating the first and second derivatives of the PGG displacement waveform. This study, therefore, compared the second derivative of the PGG signal with simultaneously measured impact stress in an excised canine larynx model. Glottal transillumination (PGG) was measured with a subglottic transducer. A miniature force transducer placed in the midline between the vocal folds measured impact stress at the midglottal position. For nine different larynges, there was a positive and linear relationship between the second derivative of PGG and impact stress. The statistically significant results support the hypothesis that the second derivative of PGG m ay provide a use fulnoninvasive way to estimate relative vocal fold impact stress.

Original languageEnglish (US)
Pages (from-to)4-14
Number of pages11
JournalJournal of voice : official journal of the Voice Foundation
Issue number1
StatePublished - Mar 2001
Externally publishedYes

ASJC Scopus subject areas

  • Otorhinolaryngology
  • LPN and LVN
  • Speech and Hearing


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