Correspondence of electroglottographic closed quotient to vocal fold impact stress in excised canine larynges

Katherine Verdolini, Roger Chan, Ingo R. Titze, Markus Hess, Wolfgang Bierhals

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


The purpose of this study was to explore the possible use of the electroglottographic closed quotient (EGG CQ) as a noninvasive estimate of vocal fold impact stress (SI). Two excised canine larynges were used. Each larynx was mounted and vocal fold oscillation was induced using a humidified air source. Twenty-seven experimental trials were conducted for each larynx. Trials involved variations in vocal process gap, vocal fold elongation, and subglottic pressure. Simultaneous measures were made of vocal fold SI at the midpoint of the membranous vocal folds, and EGG CQ (dimensionless ratio). The results indicated that when threshold and saturation effects were excluded, the SI and the CQ were strongly related (linear correlation r = .83 and .96 for the two individual larynges, and .81 for the combined data). Within the region of linear relation, an increase of. 15 in the CQ corresponded to about 1 kPa increase in SI for the combined data. Discussion focuses on possible clinical implications and the likely reasons for threshold and saturation phenomena.

Original languageEnglish (US)
Pages (from-to)415-423
Number of pages9
JournalJournal of Voice
Issue number4
StatePublished - 1998


  • Closed quotient
  • Electroglottography
  • Excised larynx
  • Intraglottal SI
  • Intraglottal impact stress
  • Vocal folds

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Speech and Hearing
  • LPN and LVN


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