Randomized controlled trial of vocal function exercises on muscle tension dysphonia in vietnamese female teachers

Duy Nguyen Duong, Dianna T. Kenny

Research output: Contribution to journalArticle

36 Citations (Scopus)


Objective: This study evaluated the treatment effects of vocal function exercises on muscle tension dysphonia (MTD) in tonal language speakers. Design: Single-blinded, randomized, controlled, clinical trial. Methods: Forty female primary school teachers from Northern Vietnam, diagnosed with MTD, were randomly allocated into a treatment group (n = 22), which used a full vocal exercise protocol (FE) (modified for use with Vietnamese speakers), and a control group (n = 18) which was treated with a partial vocal exercise protocol (PE). The treatment duration was 4 weeks for both groups. Main Outcome Measures: Acoustic and perceptual data were used as primary outcome measures. Acoustic parameters included frequency and amplitude perturbation, harmonics-to-noise ratio (HNR), mean fundamental frequency of the broken and rising tones, and parameters representing pitch movement in the rising tone. Perceptual analyses were performed on pre- and posttreatment samples of the sustained /a/ sound using anchor vocal samples. Self-report data, collected via a posttreatment questionnaire, comprised the secondary outcome measure. Results: Significant changes in perturbation, HNR, and perceptual data were observed in the FE group but not in the PE group. The FE group showed increased size and speed of pitch change. Participants from both groups showed positive changes in some tonal parameters after treatment. However, the magnitude of change and the number of participants with positive changes were larger in the FE group. Conclusion: The data showed that vocal function exercises may be a cost-effective treatment for MTD.

Original languageEnglish
Pages (from-to)261-278
Number of pages18
JournalJournal of Otolaryngology - Head and Neck Surgery
Issue number2
Publication statusPublished - Apr 2009


  • Muscle tension dysphonia
  • Randomized controlled trial
  • Teachers
  • Vietnamese tones
  • Vocal function exercises
  • Voice therapy

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