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Journal of Speech and Hearing Research Vol.37 1001-1007 October 1994.
© American Speech-Language-Hearing Association
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Dependence of Phonatory Effort on Hydration Level

Katherine Verdolini 1
Ingo R. Titze 2

Ann Fennell 1
1 Department of Speech Pathology and Audiology National Center for Voice and Speech The University of Iowa Iowa City
2 Department of Speech Pathology and Audiology National Center for Voice and Speech The University of Iowa Iowa City Recording and Research Center Denver Center for the Performing Arts Denver, CO

verdolini{at}wjshcpo-shc.uiowa.edu

In this study, a double-blind placebo-controlled approach was used to assess the relation between hydration level and phonatory effort. Twelve adult, untrained voice users with normal voices participated as subjects. Each subject received a 4-hour hydration treatment, a 4-hour dehydration treatment, and a 4-hour placebo (control) treatment. Following each treatment, phonatory effort was measured with a physiological measure, phonation threshold pressure (PTP), and with a psychological measure, direct magnitude estimation of perceived phonatory effort (DMEPPE). Summarizing the results across these measures, the findings indicated an inverse relation between phonatory effort and hydration level, but primarily for high-pitched phonation tasks. The findings for PTPs replicated those from an earlier study conducted without double-blind experimental manipulations (Verdolini-Marston, Titze, & Druker, 1990). Theoretical discussion focuses on the possible role of vocal fold tissue viscosity for hydration and dehydration effects, although direct measures of tissue viscosity are lacking.

KEY WORDS: hydration, voice, subglottal pressure, phonatory effort, viscosity

Submitted on February 2, 1993
Accepted on March 28, 1994


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This article has been cited by other articles:


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 Voice and Voice DisordersHome page
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[Abstract] [Full Text] [PDF]


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Copyright © 1994 by the American Speech-Language-Hearing Association.