Summary
Objectives
Balanced hydration is crucial for optimal physiological function, whereas hypohydration
may cause adverse effects. Like many other organs, the larynx is negatively affected
by hypohydration, potentially affecting voice production. Therefore, the purpose of
this study was to examine voice properties in women diagnosed with dry-mouth.
Methods
Twenty-four women diagnosed with hyposalivation and 24 age-matched controls were recruited.
All participants underwent three sialometry tests for quantifying oral-dryness. These
tests were conducted in three conditions: after 2-hour fasting, after gustatory salivary
stimulation and after drinking water. After each sialometry, participants were recorded
while producing the vowels /a/ and /i/, and during a standardized reading task. A
basic set of acoustic measures was extracted from these recordings. Self-evaluation
of voice was performed using the VHI-10 questionnaire; and listeners’ perception of
the voice was performed by five professional judges who rated the recordings perceptually,
using the GRBAS scale.
Results
Significant group differences were found in fundamental frequency and jitter, but
not in shimmer and noise-to-harmonic ratio (corrected P < 0.05). The participants in the hyposalivation group exhibited higher scores on
the VHI-10 questionnaire compared to the control group (P = 0.002), and the judges perceptually rated their voices higher on the Grade and
Roughness scales (0.03 ≤ P ≤ 0.04). In contrast with the significant group differences, no significant differences
were found between the three study conditions.
Conclusions
Women suffering from oral-dryness were shown to exhibit degradation in voice quality,
evident in both acoustic, perceptual and self-evaluation measures. However, in this
paradigm, short-term superficial hydration was not shown to elicit a significant improvement
in voice properties. These findings highlight the importance of consistent oral-hydration
for voice, especially among people suffering from hyposalivation.
Key Words
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Article info
Publication history
Published online: January 29, 2021
Accepted:
January 13,
2021
Identification
Copyright
© 2021 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
