Hoop, T. de (Tom) (2017) Establishing a method to estimate the ability of glottal-resistance-independent loud voice phonation using a humming-crescendo task. thesis, Medicine.
Full text available on request.Abstract
Goals and methods: The goal of this research project was to assess whether or not a task involving humming, a well-known technique in vocal training, while gradually increasing vocal intensity can induce loud phonation with little increase in laryngeal resistance. 20 non-dysphonic volunteers were asked to participate as were 13 dysphonic patients referred to the hospital with complaints of hoarseness. All participants from both groups were asked to perform two phonatory tasks: 1) vowel (/e:/) with gradually increasing vocal intensity (a vowel-crescendo task; VCT) and 2) hum (/m:/) with gradually increasing vocal intensity (a humming-crescendo task; HCT) under high-speed digital imaging (HSDI). During performance of these tasks, laryngeal HSDI movies, sound pressure levels (SPL) and electroglottographic (EGG) signals were recorded. In addition, non-dysphonic participants were asked to perform both tasks without HSDI, eliminating transnasal fiberscopy. Perturbation parameters of the EGG signals were calculated, and supraglottic compression parameters from the HSDI laryngeal movies were measured. Where imaging allowed it, the glottal area waveforms (GAW) were extracted from the HSDI laryngeal movies and analysed. Results: Of the 20 non-dysphonic participants 5 (25%) failed VCT and only 2 (10%) failed HCT, where all 3 participants with musical training did not show failure in either task; for the 13 dysphonic patients only 1 (8%) failed VCT and 6 (46%) failed HCT. A chi-square test shows a significantly lower proportion of failure for HCT in non-dysphonic participants compared to dysphonic patients. Regarding the analysis of measurements and parameters in non-dysphonic participants, VCT produced a significantly higher SPL compared to HCT; HCT produced a significantly lower value for the EGG perturbation parameter of APQ 11, but not PPQ 5, compared with VCT; in the anterior-posterior (AP), false vocal fold (FVF) indices and approximated normalized laryngeal outlet (NLO), HCT induced greater values compared to VCT; the average duration of transient glottal closure (TGC) was shorter during HCT compared to VCT. When recording without HSDI, only APQ-11 was significantly lower for both VCT and HCT compared with recording under HSDI. In the dysphonic group, although the SPL was significantly higher during VCT compared with HCT, no other parameters yielded any statistical significance between the two tasks. Comparisons between both groups produced significantly lower values only for APQ 11 and PPQ 5 during HCT for non-dysphonic participants, for now. Conclusion: These results demonstrate that humming makes it easy to increase vocal loudness with little increase in vocal fold irregularity, transient prephonatory glottal closure or supraglottic compression compared with normal vowel loud phonation, although the maximum SPL during humming is lower compared to vowel loud phonation, suggesting that humming facilitates loud phonation without enhancing the laryngeal resistance in non-dysphonic speakers, limiting the risk of phonotrauma.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Hofman, Dr. R. and head of education dept of otorhinolaryngology, University of |
| Supervisor name: | Dr. M. Ogawa, associate professor dept. of otorhinolaryngolo |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:42 |
| Last Modified: | 25 Jun 2020 10:42 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/395 |
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