Aerodynamic assessment of vocal function using hand-held spirometers

This study examined the feasibility of clinically adapting lightweight, compact spirometers to perform aerodynamic assessment of vocal function in adults. The validity of vital capacity and phonation quotient measurements made with such instruments was assessed, and a multiple regression analysis was performed in order to develop a formula for estimating mean flow rate from the phonation quotient. Nineteen healthy young adults performed the aerodynamic tasks. Data provided by a Collins wet respirometer were compared with data provided by three handheld, lightweight spirometers. Vital capacity and maximum phonation time were the key elements used to predict mean flow rate. Findings indicated that handheld spirometers can be used to provide aerodynamic assessment of vocal function.