Summary
Purpose
The aim of the study was to compare the different parameters, regarding the peak and
mean, at different phonatory tasks for standardization of electromyography signal
of electrical activity (EA) of the laryngeal extrinsic muscles on voice evaluation.
Methods
The electrical potentials of the suprahyoid (SH) and infrahyoid (IH) muscles of 35
voluntary nondysphonic subjects were evaluated using three evaluations of rest, two
maneuvers to determine maximum voluntary sustained activity (MVSA), and usual and
strong intensity of vowel /ɛ/ and 20–30 count emissions. The EA signal was converted
using root mean square in microvolts and normalized by mean and peak of each task.
The selected normalization task was that with minor coefficient of variation for all
muscles.
Results
The tasks that provided minor coefficient of variation of EA in both muscle groups
were the peak of vowel /ɛ/ (mean potentials equal to 43.31 ± 2.97 for right IH, 36.27 ± 2.76
for left IH, and 42.11 ± 2.57 for SH) and the 20–30 count emissions (mean potentials
equal to 31.30 ± 308 for right IH, 30.56 ± 2.76 for left IH, and 30.43 ± 4.22 for
SH), both in usual intensity and MVSA, as second option.
Conclusions
The peak of vowel /ɛ/ and 20–30 count emissions is usual intensity, and the MVSA as
second option should be considered for signal normalization in SH and IH muscles,
and may provide conditions for using the surface electromyography in voice clinic.
Key Words
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Article info
Publication history
Published online: June 12, 2014
Accepted:
March 17,
2014
Identification
Copyright
© 2015 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
