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Influence of syllable train length and performance end effects on estimation of phonation threshold pressure
Katherine Y Faver1, Laura W Plexico, Mary J Sandage
1Department of Communication Disorders, Auburn University, Auburn, Alabama 36849, USA.
Objectives:
The purpose of this study was to determine whether the number of syllables collected and performance end effects had a significant effect on phonation threshold pressure (PTP) estimates.
Methods:
Ten adult females with normal voices produced five- and seven-syllable trains of /pi/ at low, modal, and high pitches. The results were analyzed using repeated-measures analysis of variance to determine whether a difference existed in PTP when a five-syllable train was collected versus when a seven-syllable train was collected and whether the typically discarded first and last syllables within a train differed from the middle syllables.
Results:
The results indicated that there was no significant difference in estimated PTP values when calculated from a five-syllable versus a seven-syllable train or between the first, middle, and last syllables within a train.
Conclusions:
Based on these findings, it appears that a five-syllable train provides adequate information from which to estimate PTP values. Furthermore, these findings also suggest that within the five-syllable train, any three adjacent syllables could be used to estimate PTP. These findings are significant in developing a clinically standardized, effective, and efficient method for collecting PTP.
