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ORIGINAL ARTICLE
Commun Sci Disord. 2021;26(4): 921-932.
Published online December 31, 2021.
doi: https://doi.org/10.12963/csd.21849
Vocal Fold Vibration Characteristics during SOVTE using a Vibration Simulator and Digital Kymography
Ji Sung Kima , Seong Hee Choib , Kyungjae Leeb , Chul-Hee Choib , Soo-Geun Wangc , and Dong-Wook Leed
aDepartment of Otorhinolaryngology, Chungbuk National University Hospital, Cheongju, Korea
bDepartment of Audiology & Speech-Language Pathology, Daegu Catholic University, Gyeongsan, Korea
cDepartment of Otolaryngology, School of Medicine, Pusan National University, Pusan, Korea
dDepartment of Otorhinolaryngology-Head and Neck Surgery, Chungbuk National University College of Medicine, Cheongju, Korea
Corresponding Author: Seong Hee Choi ,Tel: +82-53-850-2542, Fax: +82-53-359-6780, Email: shgrace@cu.ac.kr
Received September 7, 2021  Revised: November 26, 2021   Accepted November 26, 2021
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ABSTRACT
Objectives
The purpose of this study is to investigate the characteristics of vocal fold vibration during sustained vowel /a/ phonation and various semi-occluded vocal tract exercise (SOVTEs) using a vibration simulator and digital kymography (DKG).
Methods
A total of 12 normal young speakers (6 males, 6 females) aged 20-30 years participated in the study. They phonated a sustained /a/ vowel and performed SOVTE. The vocal fold vibration characteristics were measured according to the number of vibration sources (single vs. double), and vocal tract occlusion degree using a vibration simulator and DKG. Glottal gap quotient (GQ, %), speed quotient (SQ, %) and amplitude (pixel) were estimated quantitatively from the DKG image.
Results
The results showed that significantly higher GQ (p = .000) and SQ (p = .000) were observed in the humming and bilabial fricative /β/ compared to open vowels. The amplitude was significantly higher in the open vowel /a/ than in humming (p = .018) and bilabial fricative /β/ (p = .003). Also, when comparing the vocal fold vibration parameters according to vibration type (single source: straw phonation vs. double source: straw phonation with water), the double source presented a significantly higher GQ (p = .000) as well as SQ (p = .008) in comparison with a single source.
Conclusion
SOVTE showed a glottal gap that is different from the opened vowel /a/. It also had a longer opening of the vocal fold and a smaller amplitude than the vowel. This suggests that SOVTE may be helpful for facilitating vocal fold vibration and good voice quality in clinical practice. The current study can be meaningful in providing theoretical and clinical evidence for SOVTE.
Keywords: SOVTE | 2D DKG | Vibration simulator | Vocal fold vibration
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