title: Influence of syllable train length and performance end effects on estimation of phonation threshold pressure.
abstract: OBJECTIVE
  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.
authors.affiliation: Department of Communication Disorders, Auburn University, Auburn, Alabama 36849, USA.
authors.forename: Katherine Y
authors.initials: KY
authors.lastname: Faver
authors.forename: Laura W
authors.initials: LW
authors.lastname: Plexico
authors.forename: Mary J
authors.initials: MJ
authors.lastname: Sandage
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D010699:Phonation / Q000502:physiology*; D011312:Pressure; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted; D014827:Vocal Cords / Q000502:physiology*; D014834:Voice Training; D055815:Young Adult