Summary
Objective
Within the scope of semi-occluded vocal tract exercises (SOVTEs), we aimed to examine
the effects of four exercise combinations, which involved various fluid densities
and tube submersion depths, on acoustic and electroglottographic (EGG) parameters.
Methods
Four procedures (P) were applied consecutively to 30 female participants with normal
voices using different tube submersion depths and fluid densities, including P1 (2 cm, water), P2 (2 cm, nectar), P3 (10 cm, water), and P4 (10 cm, nectar). Nasometric (Nasometer II model 6450) and EGG (Electroglottograph model 6103) measurements
were taken before the procedures were initiated (pre-test) and at the end of each
procedure. In addition, EGG measurements were taken for each procedure during the
application.
Results
For all three velar positions (oral passage, oro-nasal passage, nasal passage), the
only procedure that caused a significant change compared to the pre-test stage in
regard to nasalance score was P2 (2 cm nectar) in common. All other procedures except P1 (2 cm water) significantly increased velar closure compared to pre-test levels. However, when
the differences between the exercises were examined, the least velar closure, compared
to the other procedures, was obtained after P4 (10 cm nectar). While there was no significant difference between the procedures in the EGG measurements
during the exercise, a significantly higher tendency to contact was observed after
the procedures with a denser consistency, and an increase in the fundamental frequency
(fo) values occurred in the pairwise comparisons of the procedures in the measurements
after the exercises.
Conclusion
In SOVTEs in which water phonation is performed with a tube, the use of a fluid with
a consistency denser than water can be considered a particularly promising approach.
In addition, exercises performed with increasing consistencies in 2 cm depth can provide
more vocal cord and velopharyngeal port closure by increasing EGG-CQ and nasalance
score values. However, more care should be taken while increasing the consistency
at a submersion depth of 10 cm.
Key Words
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Article info
Publication history
Published online: May 24, 2022
Accepted:
April 18,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
