Variability of fundamental frequency measures

Abstract

This study was designed to obtain fundamental frequency (Fo) data based on repeated measures from a group of normal subjects and to provide preliminary normative data of Fo variability within individual subjects. Sixteen female subjects participated in this study. Their Fo's were measured daily for 8 days. It was found that the Fo's of both individual subjects and of the subjects as a group varied considerably over the 8-day period. It is recommended that the clinician take repeated, over time measurements of clients' Fo's and other vocal parameters in order to establish sound baseline data for voice therapy.

Key Words:

• fundamental frequency
• Fo variability
• voice evaluation