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Measures of vocal function during changes in vocal effort level

D Z Huang1, F D Minifie, H Kasuya

  • 1Department of Speech and Hearing Sciences, University of Washington, Seattle 98195, USA.

Journal of Voice : Official Journal of the Voice Foundation
|December 1, 1995
PubMed
Summary
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Vocal effort significantly impacts acoustic and electroglottographic measures like jitter and shimmer. Controlling vocal effort and accounting for day-to-day variability are crucial for consistent clinical voice assessments.

Area of Science:

  • Speech science
  • Voice acoustics
  • Clinical phonetics

Background:

  • Acoustic and electroglottographic parameters are vital for voice analysis.
  • Understanding variability in these measures is essential for accurate clinical interpretation.

Purpose of the Study:

  • To investigate the day-to-day variability of acoustic (jitter, shimmer, normalized noise energy) and electroglottographic (contact quotient, contact quotient perturbation) parameters.
  • To determine the influence of vocal effort (low, normal, high) on these voice parameters.

Main Methods:

  • A controlled study using a repeated measures design.
  • Subjects produced vowels /ae/ and /a/ five times daily over 3 days at each vocal effort level.
  • Sophisticated bilinear interpolation pitch detection was employed.

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Main Results:

  • Significant variations in jitter, shimmer, normalized noise energy, contact quotient, and contact quotient perturbation were observed across different vocal effort levels.
  • Day-to-day variability was noted for all measured parameters.

Conclusions:

  • Vocal effort levels must be standardized to ensure reliable and consistent clinical voice measurements.
  • Acknowledging and accounting for day-to-day fluctuations in voice parameters is necessary for obtaining representative clinical data.