Summary
Objectives
The aim of this study is to explore the effects of the angle of epiglottis (Aepi)
on phonation and resonance in excised canine larynges.
Methods
The anatomic Aepi was measured for 14 excised canine larynges as a control. Then,
the Aepis were manually adjusted to 60° and 90° in each larynx. Aerodynamic and acoustic
parameters, including mean flow rate, sound pressure level, jitter, shimmer, fundamental
frequency (F0), and formants (F1′–F4′), were measured with a subglottal pressure of
1.5 kPa. Simple linear regression analysis between acoustic and aerodynamic parameters
and the Aepi of the control was performed, and an analysis of variance comparing the
acoustic and aerodynamic parameters of the three treatments was carried out.
Results
The results of the study are as follows: (1) the larynges with larger anatomic Aepi
had significantly lower jitter, shimmer, formant 1, and formant 2; (2) phonation threshold
flow was significantly different for the three treatments; and (3) mean flow rate
and sound pressure level were significantly different between the 60° and the 90°
treatments of the 14 larynges.
Conclusions
The Aepi was proposed for the first time in this study. The Aepi plays an important
role in phonation and resonance of excised canine larynges.
Key Words
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Article info
Publication history
Published online: June 28, 2018
Accepted:
February 9,
2018
Footnotes
Conflict of interest: The authors have no funding, financial relationships, or conflicts of interest to disclose.
Identification
Copyright
© 2018 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
