Objective measures of voice production in normal subjects following prolonged voice use.

Laryngeal fatigue affects the physical sensations, effort, and perceptual quality of voice production. The underlying physiology of fatigue is not well understood. Acoustic, aerodynamic, and videostroboscopic data were measured in 10 normal speakers before and after prolonged voice use. Significant changes were found in the fundamental frequency of connected speech. Anterior glottal chinks were induced in a majority of subjects. Implications are discussed.