Vocal Fold Adjustment Caused by Phonation into a Tube: A Double-Case Study Using Computed Tomography

Vít Hampala*, Anne Maria Laukkanen, Marco A. Guzman, Jaromír Horáček, Jan G. Švec

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Objectives Phonation into a tube is a widely used method for vocal training and therapy. Previous studies and practical experience show that the phonation becomes easier and louder after such an exercise. The purpose of this study was to find out whether there are systematic changes in the vocal fold adjustment after the exercise. Methods Two volunteer subjects (1 male and 1 female) without voice disorders were examined with computed tomography (CT). Both produced a sustained vowel [a:] at comfortable pitch and loudness before and after the tube phonation and a vowel-like phonation into the tube. Computed tomography (CT) scans were obtained before, during, and after the exercise, twice for each condition. The gathered CT images were used for measurements of vertical vocal fold thickness, bulkiness, length, and glottal width. Results No prominent trends common to both subjects were found in vocal fold adjustment during and after the phonation into the tube. Variability observed under the same conditions was usually of the same magnitude as the changes before and after the tube phonation. Conclusions Changes in vocal tract configuration observed after the resonance tube exercises in previous related studies were more prominent than the changes in vocal fold configuration observed here.

Original languageEnglish
Pages (from-to)733-742
Number of pages10
JournalJournal of Voice
Issue number6
StatePublished - 1 Nov 2015
Externally publishedYes

Bibliographical note

Funding Information:
The research has been supported by the Academy of Finland grant No. 134868 (A.M.L.) and in the Czech Republic by the Palacky University student's projects IGA_PrF_2013_017 and IGA_PrF_2014_029 (V.H.), by the European Social Fund Projects OP VK CZ.1.07/2.3.00/20.0057 (J.G.S.), OP VK CZ.1.07/2.4.00/17.0009 (V.H. and J.G.S.), and by the grant GA ČR P101/12/1306 (J.H.).

Publisher Copyright:
© 2015 The Voice Foundation.


  • Computed tomography
  • Resonance tube
  • Vocal folds


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