Efficacy of vocal function exercises as a method of improving voice production.

Objective voice analysis including acoustic, aerodynamic, and laryngeal videostroboscopic measures demonstrated normal voice in 35 adult women. The subjects were then randomly divided into experimental, placebo, and control groups. The experimental group engaged in vocal function exercises. The placebo group engaged in a placebo exercise program. Objective measures taken after 4 weeks of execise demonstrated significant changes in phonation volume, flow rate, maximum phonation time, and frequency range for the experimental group. No significant changes were noted in the measurements of the control and placebo groups.