Involuntary glottal closure during inspiration in muscle tension dysphonia.

Objective/hypothesis: The purpose of this study was to examine respiratory function in a group of patients with muscle tension dysphonia (MTD) DESIGN: Cross-sectional analytical study.

Methods: Participants included 15 people with a diagnosis of MTD referred to speech pathology for management of their voice disorder, fiberoptic evidence of glottal or supraglottic constriction during phonation with or without posterior chink, or bowing combined and deviation in perceptual voice quality. A second group of 15 participants with no history of voice disorder served as healthy controls.