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Effects of a simulated system of straw phonation on the complete phonatory range of excised canine larynges

  • Jing Kang
  • Austin Scholp
  • Jacob Tangney
  • Jack J. Jiang
Laryngology

Abstract

Purpose

This study investigated the effects of straw phonation therapy on the aerodynamic and acoustic parameters of the vocal folds at different levels of elongation and subglottal pressure.

Methods

20 excised canine larynges were used in both experimental (straw phonation therapy simulation) and control conditions. Aerodynamic parameters, including phonation threshold pressure (PTP), phonation instability pressure (PIP), phonation pressure range (PPR), phonation threshold flow (PTF), phonation instability flow (PIF), phonation flow range (PFR), were obtained at different levels of vocal fold elongation (0%, 10%, 20%). Acoustic parameters, including fundamental frequency (F0), jitter, shimmer, signal noise ratio (SNR) were detected at different levels of vocal fold elongation (0%, 10%, 20%) and subglottal pressure (15 cmH2O, 20 cmH2O, 25 cmH2O).

Results

Significant decreases in PTP and PTF and significant increases in PIP, PIF, PPR, and PFR occurred in experimental condition at all levels of elongation when compared with control condition. However, no significant changes of acoustic parameters were obtained between conditions at all levels.

Conclusion

At different levels of vocal fold elongation, straw phonation not only lowered the onset of normal voice, but also elevated the onset of chaotic voice, indicating a better voice economy and voice control. Moreover, the improved phonatory range demonstrated that straw phonation had the potential to prevent voice users who have high voice demand from voice fatigue and vocal damage.

Keywords

Excised larynx Semi-occluded vocal tract Straw phonation Aerodynamics Chaotic voice 

Notes

Acknowledgements

This study was funded by National Institutes of Health Grant numbers R01 DC015906-01A1 from the National Institute on Deafness and Other Communication Disorders.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Otolaryngology-Head and Neck SurgeryEENT Hospital of Fudan UniversityShanghaiChina
  2. 2.Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, School of Medicine and Public HealthUniversity of Wisconsin-MadisonMadisonUSA

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