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Short-term effect of two semi-occluded vocal tract training programs on the vocal quality of future occupational voice users : 'resonant voice training using nasal consonants' versus 'straw phonation'

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Abstract
Purpose: The purpose of this study was to determine the short-term effect of 2 semi-occluded vocal tract training programs, "resonant voice training using nasal consonants" versus "straw phonation," on the vocal quality of vocally healthy future occupational voice users. Method: A multigroup pretest-posttest randomized control group design was used. Thirty healthy speech-language pathology students with a mean age of 19 years (range: 17-22 years) were randomly assigned into a resonant voice training group (practicing resonant exercises across 6 weeks, n = 10), a straw phonation group (practicing straw phonation across 6 weeks, n = 10), or a control group (receiving no voice training, n = 10). A voice assessment protocol consisting of both subjective (questionnaire, participant's self-report, auditory-perceptual evaluation) and objective (maximum performance task, aerodynamic assessment, voice range profile, acoustic analysis, acoustic voice quality index, dysphonia severity index) measurements and determinations was used to evaluate the participants' voice pre- and posttraining. Groups were compared over time using linear mixed models and generalized linear mixed models. Within-group effects of time were determined using post hoc pairwise comparisons. Results: No significant time x group interactions were found for any of the outcome measures, indicating no differences in evolution over time among the 3 groups. Within-group effects of time showed a significant improvement in dysphonia severity index in the resonant voice training group, and a significant improvement in the intensity range in the straw phonation group. Conclusions: Results suggest that the semi-occluded vocal tract training programs using resonant voice training and straw phonation may have a positive impact on the vocal quality and vocal capacities of future occupational voice users. The resonant voice training caused an improved dysphonia severity index, and the straw phonation training caused an expansion of the intensity range in this population.
Keywords
GLOTTAL CONTACT QUOTIENT, THERAPY, DISORDERS, INDEX, TEACHERS, SINGERS, TRIAL, TUBE, MASK

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MLA
Meerschman, Iris et al. “Short-term Effect of Two Semi-occluded Vocal Tract Training Programs on the Vocal Quality of Future Occupational Voice Users : ‘Resonant Voice Training Using Nasal Consonants’ Versus ‘Straw Phonation’.” JOURNAL OF SPEECH LANGUAGE AND HEARING RESEARCH 60.9 (2017): 2519–2536. Print.
APA
Meerschman, I., Van Lierde, K., Peeters, K., Meersman, E., Claeys, S., & D’haeseleer, E. (2017). Short-term effect of two semi-occluded vocal tract training programs on the vocal quality of future occupational voice users : “resonant voice training using nasal consonants” versus “straw phonation.” JOURNAL OF SPEECH LANGUAGE AND HEARING RESEARCH, 60(9), 2519–2536.
Chicago author-date
Meerschman, Iris, Kristiane Van Lierde, Karen Peeters, Eline Meersman, Sofie Claeys, and Evelien D’haeseleer. 2017. “Short-term Effect of Two Semi-occluded Vocal Tract Training Programs on the Vocal Quality of Future Occupational Voice Users : ‘Resonant Voice Training Using Nasal Consonants’ Versus ‘Straw Phonation’.” Journal of Speech Language and Hearing Research 60 (9): 2519–2536.
Chicago author-date (all authors)
Meerschman, Iris, Kristiane Van Lierde, Karen Peeters, Eline Meersman, Sofie Claeys, and Evelien D’haeseleer. 2017. “Short-term Effect of Two Semi-occluded Vocal Tract Training Programs on the Vocal Quality of Future Occupational Voice Users : ‘Resonant Voice Training Using Nasal Consonants’ Versus ‘Straw Phonation’.” Journal of Speech Language and Hearing Research 60 (9): 2519–2536.
Vancouver
1.
Meerschman I, Van Lierde K, Peeters K, Meersman E, Claeys S, D’haeseleer E. Short-term effect of two semi-occluded vocal tract training programs on the vocal quality of future occupational voice users : “resonant voice training using nasal consonants” versus “straw phonation.”JOURNAL OF SPEECH LANGUAGE AND HEARING RESEARCH. 2017;60(9):2519–36.
IEEE
[1]
I. Meerschman, K. Van Lierde, K. Peeters, E. Meersman, S. Claeys, and E. D’haeseleer, “Short-term effect of two semi-occluded vocal tract training programs on the vocal quality of future occupational voice users : ‘resonant voice training using nasal consonants’ versus ‘straw phonation,’” JOURNAL OF SPEECH LANGUAGE AND HEARING RESEARCH, vol. 60, no. 9, pp. 2519–2536, 2017.
@article{8520963,
  abstract     = {Purpose: The purpose of this study was to determine the short-term effect of 2 semi-occluded vocal tract training programs, "resonant voice training using nasal consonants" versus "straw phonation," on the vocal quality of vocally healthy future occupational voice users. 
Method: A multigroup pretest-posttest randomized control group design was used. Thirty healthy speech-language pathology students with a mean age of 19 years (range: 17-22 years) were randomly assigned into a resonant voice training group (practicing resonant exercises across 6 weeks, n = 10), a straw phonation group (practicing straw phonation across 6 weeks, n = 10), or a control group (receiving no voice training, n = 10). A voice assessment protocol consisting of both subjective (questionnaire, participant's self-report, auditory-perceptual evaluation) and objective (maximum performance task, aerodynamic assessment, voice range profile, acoustic analysis, acoustic voice quality index, dysphonia severity index) measurements and determinations was used to evaluate the participants' voice pre- and posttraining. Groups were compared over time using linear mixed models and generalized linear mixed models. Within-group effects of time were determined using post hoc pairwise comparisons. 
Results: No significant time x group interactions were found for any of the outcome measures, indicating no differences in evolution over time among the 3 groups. Within-group effects of time showed a significant improvement in dysphonia severity index in the resonant voice training group, and a significant improvement in the intensity range in the straw phonation group. 
Conclusions: Results suggest that the semi-occluded vocal tract training programs using resonant voice training and straw phonation may have a positive impact on the vocal quality and vocal capacities of future occupational voice users. The resonant voice training caused an improved dysphonia severity index, and the straw phonation training caused an expansion of the intensity range in this population.},
  author       = {Meerschman, Iris and Van Lierde, Kristiane and Peeters, Karen and Meersman, Eline and Claeys, Sofie and D'haeseleer, Evelien},
  issn         = {1092-4388},
  journal      = {JOURNAL OF SPEECH LANGUAGE AND HEARING RESEARCH},
  keywords     = {GLOTTAL CONTACT QUOTIENT,THERAPY,DISORDERS,INDEX,TEACHERS,SINGERS,TRIAL,TUBE,MASK},
  language     = {eng},
  number       = {9},
  pages        = {2519--2536},
  title        = {Short-term effect of two semi-occluded vocal tract training programs on the vocal quality of future occupational voice users : 'resonant voice training using nasal consonants' versus 'straw phonation'},
  url          = {http://dx.doi.org/10.1044/2017_JSLHR-S-17-0017},
  volume       = {60},
  year         = {2017},
}

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