Summary
Purpose
The present study was designed to assess the immediate effects of the semi-occluded
ventilation mask (SOVM) in subjects with functional dysphonia and subjects with normal
voice.
Methods
Sixty-four participants were included in this study (48 women and 16 men). Thirty-one
of them were diagnosed with functional dysphonia and 33 with normal voice. All subjects
were randomly assigned to one of two conditions: an experimental condition using the
SOVM (n = 33) and a control condition with participants not using the SOVM (n = 31).
Thus, within both conditions, participants could be either dysphonic or normal-voiced.
This produced a total of four different groups: (1) subjects with normal voice with
SOVM (n = 17), (2) subjects with normal voice without SOVM (n = 16), (3) dysphonic
subjects with SOVM (n = 16), and (4) dysphonic subjects without SOVM (n = 15). All
participants underwent aerodynamic, electroglottographic (EGG), and acoustic assessments,
and were also asked to assess their own voice, before and after voice exercises.
Results
Significant differences were found for aerodynamic, EGG, and acoustic variables when
comparing SOVM conditions (dysphonic and normal) against control. Cepstral peak prominence
and EGG contact quotient showed an increase among dysphonic participants with SOVM.
L1-L0 showed an increase for all participants in SOVM condition (dysphonic and normal).
Self-perceived resonant voice quality showed an increase for both groups in SOVM condition.
Glottal airflow showed a decrease for the dysphonic participants in SOVM condition.
Phonation threshold pressure and subglottic pressure showed a decrease for both groups
in SOVM condition.
Conclusion
The present study suggests that immediate positive effect could be produced by connected
speech phonatory tasks using the SOVM in both dysphonic subjects and subjects with
normal voice, the change being greater among the former. SOVM seems to promote an
easy voice production and a more efficient phonation.
Key Words
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Article info
Publication history
Published online: November 10, 2018
Accepted:
October 8,
2018
Identification
Copyright
© 2018 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
