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Area of Science:

  • Speech and Hearing Sciences
  • Otolaryngology
  • Rehabilitation Medicine

Background:

  • Semi-occluded vocal tract exercises (SOVTEs) are standard therapeutic interventions for voice disorders, aiming to increase upper airway resistance.
  • Two prominent SOVTE protocols, flow-resistant tube (FRT) and Lessac-Madsen Resonant Voice Therapy (LMRVT), are widely utilized.

Purpose of the Study:

  • To conduct a randomized controlled trial comparing the efficacy of FRT and LMRVT in patients with voice disorders.
  • To perform a noninferiority analysis of FRT against LMRVT.
  • To investigate the impact of therapy duration (4 vs. 8 weeks) on outcomes.

Main Methods:

  • Sixty-seven participants with voice disorders were randomized into five groups: 4-week FRT, 8-week FRT, 4-week LMRVT, 8-week LMRVT, and a control group.
  • Voice Handicap Index (VHI) and Vocal Fatigue Index were assessed pre- and post-treatment.
  • Acoustic Voice Quality Index was used for acoustic analysis; linear regression and noninferiority tests were applied.

Main Results:

  • Both 8-week FRT and 8-week LMRVT significantly reduced VHI scores compared to controls.
  • 4-week FRT also showed a significant VHI reduction versus controls, while 4-week LMRVT did not reach statistical significance.
  • FRT was found to be noninferior to LMRVT using a 10-point margin for VHI reduction.

Conclusions:

  • Both FRT and LMRVT are effective in improving VHI scores in individuals with voice disorders.
  • FRT is a viable alternative to LMRVT, offering comparable efficacy.
  • Therapy duration of 4 or 8 weeks did not yield statistically significant differences in VHI scores for either protocol.