Phonation and Respiration

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Abstract
Simultaneous registrations of the air flow rate, air volume, fundamental frequency, and voice intensity were performed on 22 normal adults during comfortable sustained phonation. The respiratory function was assessed by the use of a respirator. There is a significant correlation between the phonation volume (the total volume of air available for maximally sustained phonation) and vital capacity. Between 3000 cc and 6000 cc of vital capacity, the relation between these 2 factors is represented by the equation PV =0. 86 VC -891. The maximum duration of phonation varies with the amount of the flow rate and phonation volume. The relation among these 3 factors is expressed by the equation PV = MPT x MFR. The mean flow rate during phonation shows little variability among different subjects, and no specific relation to the fundamental frequency and intensity of the individual voice sound. The measurement of these quantities provides significant information on the overall vocal function (f [vc] = PV).

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