Authors: Andrews S, Warner J, Stewart R
Title: EMG biofeedback and relaxation in the treatment of hyperfunctional dysphonia
Source: British Journal of Disorders of Communication 1986 21(3): 353-369
Year: 1986
Research Design: Non Randomised Controlled Trial
Rating Score: 01/10
This rating is confirmed
Eligibility specified - Y
Random allocation - N
Concealed allocation - N
Baseline comparability - N
Blind subjects - N
Blind therapists - N
Blind assessors - N
Adequate follow-up - N
Intention-to-treat analysis - N
Between-group comparisons - Y
Point estimates and variability - N

Two methods of relaxing laryngeal musculature were investigated in adults with hyperfunctional dysphonia. Assessments were conducted pre-treatment, post-treatment and at three month follow-up. Measures included the level of superficial laryngeal tension using an electromyogram, control of vocal fold vibration using Fx traces from an electrolaryngograph and an auditory evaluation using a phonation profile. Two personality questionnaires were administered and the subjects' self-rating of voice was recorded. The duration of treatment was noted. Subjects were matched into groups receiving either laryngeal EMG biofeedback or progressive relaxation, both within a graded voice training programme. A significant improvement in all measures occurred for both programmes., which was maintained at follow-up. No significant difference between the two approaches emerged. Implications for the assessment and treatment of hyperfunctional dysphonia are discussed.

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