Electromyographic biofeedback training with patients exhibiting a hyperfunctional voice disorder

Area of Science:

• Laryngology
• Speech-Language Pathology
• Biofeedback Therapy

Background:

• Vocal nodules are often associated with increased laryngeal muscle tension.
• Objective measurement of laryngeal tension is crucial for diagnosis and treatment.
• Existing treatments may not fully address underlying muscle tension.

Purpose of the Study:

• To investigate differences in laryngeal muscle tension between normal subjects and those with vocal nodules.
• To evaluate the efficacy of Electromyography (EMG) biofeedback training in reducing laryngeal tension in vocal nodule patients.
• To explore the correlation between laryngeal muscle tension, voice quality, and sound pressure levels.

Main Methods:

• Baseline EMG measurements of laryngeal muscle tension were recorded in normal and vocal nodule subjects.
• Vocal nodule patients received 8 sessions of EMG biofeedback training.
• Voice quality was assessed by expert listeners, and sound pressure levels were measured.
• Follow-up EMG and voice assessments were conducted after a 2-week period.

Main Results:

• Significant differences in laryngeal muscle tension were observed between normal and vocal nodule subjects.
• EMG biofeedback training led to a significant reduction in laryngeal muscle tension in patients with vocal nodules.
• A positive correlation was found between reduced EMG measures and improved subjective voice quality.
• No significant correlation was found between EMG measures and sound pressure levels.

Conclusions:

• EMG biofeedback is an effective method for reducing laryngeal muscle tension in individuals with vocal nodules.
• Reduced laryngeal tension through biofeedback training can lead to measurable improvements in voice quality.
• Laryngeal muscle tension is a key factor in vocal nodule pathology and voice production.