Vlot, C. (Carien) (2015) Immediate effects of humming on the irregularity of vocal fold vibration in patients with organic voice disorders. thesis, Medicine.
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Abstract
Objectives. To investigate whether humming, a specific type of vocal training, can immediately improve the regularity of vocal fold vibration on electroglottography (EGG) and laryngeal high-speed digital imaging (HSDI) in patients with organic voice disorders. Methods. Perturbation parameters are calculated on previously-recorded acoustic (Ac) and EGG signals during natural and humming phonation of a series of 49 dysphonic patients diagnosed to have mass lesions in the vocal folds and as many nondysphonic speakers. In addition, 11 dysphonic patients and as many nondysphonic speakers underwent simultaneous recording of EGG signals and HSDI movies under laryngofiberscopy while performing the two vocal tasks. The perturbation parameters of the EGG signals and of the glottal area waveforms (GAW) extracted from the HSDI movies were calculated. Also, the degree of supraglottal compression was measured and compared. Results. Humming effectuated significant improvements in the EGG perturbation parameters and perceptual voice qualities in the dysphonic patients as well as in the control group between tasks. On the HSDI examination, of the 7 dysphonic patients showing decreased EGG perturbation parameters no significant change in GAW perturbation parameters was seen and no change in the degree of supraglottic compression, although a significant change in GAW perturbation parameters was seen when patients and controls were analyzed as one group. Conclusion. These results demonstrate that humming has a potential to improve the voice quality by stabilizing the oscillations of the vocal folds . Humming might improve the functional component that undermines the voice quality instead of the mechanical effect of the mass lesions in patients with organic dysphonia. Long term effects of humming on the voice quality in patients with organic dysphonia remain to be investigated.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Onder begeleiding van: and Dikkers, F.G. University of Groningen |
| Supervisor name: | M. Ogawa and Department of Otorhinolaryngology - Head and Neck Surgery, O and University Graduate School of Medicine, Suita |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:57 |
| Last Modified: | 25 Jun 2020 10:57 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/1766 |
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