PERTANIKA JOURNAL OF TROPICAL AGRICULTURAL SCIENCE

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• Andrade, P. A., Wood, G., Ratcliffe, P., Epstein, R., Pijper, A., & Svec, J. G. (2014). Electroglottographic study of seven semi-occluded exercises: LaxVox, straw, lip-trill, tongue-trill, humming, hand-over-mouth, and tongue-trill combined with hand-over-mouth. Journal of Voice, 28(5), 589-595. https://doi.org/10.1016/j.jvoice.2013.11.004

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• Barone, N. A. (2015). Effects of training and lung volume levels on voice onset control and cortical activation in singers [Doctoral dissertation, James Madison University]. https://commons.lib.jmu.edu/diss201019/29/

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• Bele, I. V. (2005). Artificially lengthened and constricted vocal tract in vocal training methods. Logopedics Phoniatrics Vocology, 30(1), 34-40. https://doi.org/10.1080/14015430510006677

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• Chang, A., & Karnell, M. P. (2004). Perceived phonatory effort and phonation threshold pressure across a prolonged voice loading task: A study of vocal fatigue. Journal of Voice, 18(4), 454-466. https://doi.org/10.1016/j.jvoice.2004.01.004

• Christmann, M. K., & Cielo, C. A. (2017). Acoustic and auditory perception effects of the voice therapy Technique Finger Kazoo in adult women. Journal of Voice, 31(3), 390.e399-390.e315. https://doi.org/10.1016/j.jvoice.2016.09.025

• Conroy, E. R., Hennick, T. M., Awan, S. N., Hoffman, M. R., Smith, B. L., & Jiang, J. J. (2014). Effect of variations to a simulated system of straw phonation therapy on aerodynamic parameters using excised canine larynges. Journal of Voice, 28(1), 1-6. https://doi.org/10.1016/j.jvoice.2013.08.004

• Costa, C. B., Costa, L. H., Oliveira, G., & Behlau, M. (2011). Immediate effects of the phonation into a straw exercise. Brazillian Journal of Otorhinolaryngology, 77(4), 461-465. https://doi.org/10.1590/s1808-86942011000400009

• Costello, D., & Sandhu, G. (2015). Practical laryngology. CRC Press. https://books.google.com.my/books?id=CGEDCwAAQBAJ

• Croake, D. J., Andreatta, R. D., & Stemple, J. C. (2017). Immediate effects of the vocal function exercises semi-occluded mouth posture on glottal airflow parameters: A preliminary study. Journal of Voice, 31(2), 245.e249-245.e214. https://doi.org/10.1016/j.jvoice.2016.08.009

• Davids, J., & LaTour, S. (2012). Vocal technique: A guide for conductors, teachers, and singers. Waveland. https://books.google.com.my/books?id=ucsSAAAAQBAJ

• Deliyski, D. D., Shaw, H. S., & Evans, M. K. (2005). Adverse effects of environmental noise on acoustic voice quality measurements. Journal of Voice, 19(1), 15-28. https://doi.org/10.1016/j.jvoice.2004.07.003

• Duke, E., Plexico, L. W., Sandage, M. J., & Hoch, M. (2015). The effect of traditional singing warm-up versus semioccluded vocal tract exercises on the acoustic parameters of singing voice. Journal of Voice, 29(6), 727-732. https://doi.org/10.1016/j.jvoice.2014.12.009

• Echternach, M., Huseynov, J., Döllinger, M., Nusseck, M., & Richter, B. (2020). The impact of a standardized vocal loading test on vocal fold oscillations. European Archives of Oto-Rhino-Laryngology, 277(6), 1699-1705. https://doi.org/10.1007/s00405-020-05791-5

• Eskenazi, L., Childers, D. G., & Hicks, D. M. (1990). Acoustic correlates of vocal quality. Journal of Speech, Language, and Hearing Research, 33(2), 298-306. https://doi.org/10.1044/jshr.3302.298

• Faber, J., & Fonseca, L. M. (2014). How sample size influences research outcomes. Dental Press Journal of Orthodontics, 19(4), 27-29. https://doi.org/10.1590/2176-9451.19.4.027-029.ebo

• Fujiki, R. B., & Sivasankar, M. P. (2017). A review of vocal loading tasks in the voice literature. Journal of Voice, 31(3), 388.e333-388.e339. https://doi.org/10.1016/j.jvoice.2016.09.019

• Gaskill, C. S., & Quinney, D. M. (2012). The effect of resonance tubes on glottal contact quotient with and without task instruction: A comparison of trained and untrained voices. Journal of Voice, 26(3), e79-93. https://doi.org/10.1016/j.jvoice.2011.03.003

• Gish, A., Kunduk, M., Sims, L., & McWhorter, A. J. (2012). Vocal warm-up practices and perceptions in vocalists: A pilot survey. Journal of Voice, 26(1), e1-e10. https://doi.org/10.1016/j.jvoice.2010.10.005

• Gökdoğan, Ç., Gökdoğan, O., Tutar, H., Aydil, U., & Yılmaz, M. (2016). Speech Range Profile (SRP) findings before and after mutational falsetto (puberphonia). Journal of Voice, 30(4), 448-451. https://doi.org/10.1016/j.jvoice.2015.05.014

• Gramming, P., Sundberg, J., Ternström, S., Leanderson, R., & Perkins, W. H. (1988). Relationship between changes in voice pitch and loudness. Journal of Voice, 2(2), 118-126. https://doi.org/10.1016/S0892-1997(88)80067-5

• Greenland, S., Senn, S. J., Rothman, K. J., Carlin, J. B., Poole, C., Goodman, S. N., & Altman, D. G. (2016). Statistical tests, P values, confidence intervals, and power: A guide to misinterpretations. European Journal of Epidemiology, 31(4), 337-350. https://doi.org/10.1007/s10654-016-0149-3

• Guzman, M., Angulo, M., Muñoz, D., & Mayerhoff, R. (2013). Effect on long-term average spectrum of pop singers’ vocal warm-up with vocal function exercises. International Journal of Speech-Language Pathology, 15(2), 127-135. https://doi.org/10.3109/17549507.2012.702283

• Guzman, M., Higueras, D., Fincheira, C., Muñoz, D., Guajardo, C., & Dowdall, J. (2013). Immediate acoustic effects of straw phonation exercises in subjects with dysphonic voices. Logopedics, Phoniatrics, Vocology, 38(1), 35-45. https://doi.org/10.3109/14015439.2012.731079

• Guzman, M., Jara, R., Olavarria, C., Caceres, P., Escuti, G., Medina, F., Medina, L., Madrid, S., Muñoz, D., & Laukkanen, A. M. (2017). Efficacy of water resistance therapy in subjects diagnosed with behavioral dysphonia: A randomized controlled trial. Journal of Voice, 31(3), 385.e381-385.e310. https://doi.org/10.1016/j.jvoice.2016.09.005

• Guzman, M., Laukkanen, A. M., Krupa, P., Horáček, J., Švec, J. G., & Geneid, A. (2013). Vocal tract and glottal function during and after vocal exercising with resonance tube and straw. Journal of Voice, 27(4), 523.e519-534. https://doi.org/10.1016/j.jvoice.2013.02.007

• Guzman, M., Rubin, A., Muñoz, D., & Jackson-Menaldi, C. (2013). Changes in glottal contact quotient during resonance tube phonation and phonation with vibrato. Journal of Voice, 27(3), 305-311. https://doi.org/10.1016/j.jvoice.2013.01.017

• Kang, J., Xue, C., Chou, A., Scholp, A., Gong, T., Zhang, Y., Chen, Z., & Jiang, J. J. (2019). Comparing the exposure-response relationships of physiological and traditional vocal warm-ups on aerodynamic and acoustic parameters in untrained singers. Journal of Voice, 33(4), 420-428. https://doi.org/10.1016/j.jvoice.2017.12.019

• Kapsner-Smith, M. R., Hunter, E. J., Kirkham, K., Cox, K., & Titze, I. R. (2015). A randomized controlled trial of two semi-occluded vocal tract voice therapy protocols. Journal of Speech, Language, and Hearing Research, 58(3), 535-549. https://doi.org/10.1044/2015_jslhr-s-13-0231

• Levendoski, E. E., Leydon, C., & Thibeault, S. L. (2014). Vocal fold epithelial barrier in health and injury: A research review. Journal of Speech, Language, and Hearing Research, 57(5), 1679-1691. https://doi.org/10.1044/2014_JSLHR-S-13-0283

• Lundy, D. S., Casiano, R. R., & Xue, J. W. (2004). Can maximum phonation time predict voice outcome after thyroplasty type I? The Laryngoscope, 114(8), 1447-1454. https://doi.org/10.1097/00005537-200408000-00025

• Manternach, J. N., Clark, C., & Daugherty, J. F. (2017). Effects of a straw phonation protocol on acoustic measures of an SATB chorus singing two contrasting renaissance works. Journal of Voice, 31(4), 514.e515-514.e510. https://doi.org/10.1016/j.jvoice.2016.12.008

• Mathieson, L., Greene, M. C. L., & Baken, R. J. (2001). Greene and Mathieson’s the voice and its disorders. Wiley. https://books.google.com.my/books?id=1KZsAAAAMAAJ

• Maxfield, L., Titze, I., Hunter, E., & Kapsner-Smith, M. (2015). Intraoral pressures produced by thirteen semi-occluded vocal tract gestures. Logopedics Phoniatrics Vocology, 40(2), 86-92. https://doi.org/10.3109/14015439.2014.913074

• McHenry, M., Johnson, J., & Foshea, B. (2009). The effect of specific versus combined warm-up strategies on the voice. Journal of Voice, 23(5), 572-576. https://doi.org/10.1016/j.jvoice.2008.01.003

• McKinney, J. C. (2005). The diagnosis and correction of vocal faults: A manual for teachers of singing and for choir directors. Waveland Press. https://books.google.com.my/books?id=znaCDwAAQBAJ

• 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. https://doi.org/10.1044/2017_jslhr-s-17-0017

• Mendes, A. P., Rothman, H. B., Sapienza, C., & Brown Jr, W. S. (2003). Effects of vocal training on the acoustic parameters of the singing voice. Journal of Voice, 17(4), 529-543. https://doi.org/10.1067/s0892-1997(03)00083-3

• Milbrath, R. L., & Solomon, N. P. (2003). Do vocal warm-up exercises alleviate vocal fatigue? Journal of Speech, Language, and Hearing Research, 46(2), 422-436. https://doi.org/10.1044/1092-4388(2003/035)

• Mills, R., Hays, C., Al-Ramahi, J., & Jiang, J. J. (2017). Validation and evaluation of the effects of semi-occluded face mask straw phonation therapy methods on aerodynamic parameters in comparison to traditional methods. Journal of Voice, 31(3), 323-328. https://doi.org/10.1016/j.jvoice.2016.04.009

• Moorcroft, L., & Kenny, D. T. (2013). Singer and listener perception of vocal warm-up. Journal of Voice, 27(2), 258.e1-258.e13. https://doi.org/10.1016/j.jvoice.2012.12.001

• Motel, T., Fisher, K. V., & Leydon, C. (2003). Vocal warm-up increases phonation threshold pressure in soprano singers at high pitch. Journal of Voice, 17(2), 160-167. https://doi.org/10.1016/s0892-1997(03)00003-1

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• Onofre, F., de Almeida Prado, Y., Rojas, G. V. E., Garcia, D. M., & Aguiar-Ricz, L. (2017). Measurements of the acoustic speaking voice after vocal warm-up and cooldown in choir singers. Journal of Voice, 31(1), 129.e9-129.e14. https://doi.org/10.1016/j.jvoice.2015.12.004

• Parncutt, R., & McPherson, G. (2002). The science and psychology of music performance: Creative strategies for teaching and learning. Oxford University Press. https://books.google.com.my/books?id=l5unYHW80csC

• Portillo, M. P., Rojas, S., Guzman, M., & Quezada, C. (2018). Comparison of effects produced by physiological versus traditional vocal warm-up in contemporary commercial music singers. Journal of Voice, 32(2), 200-208. https://doi.org/10.1016/j.jvoice.2017.03.022

• Raes, J., Wuyts, F. L., De Bodt, M., & Clement, P. (2002). The Dysphonia Severity Index used with a percentage scale. Stem-, Spraak- en Taalpathologie, 11(1), 30-37. https://sstp.nl/article/download/19293/16768

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• Robieux, C., Galant, C., Lagier, A., Legou, T., & Giovanni, A. (2015). Direct measurement of pressures involved in vocal exercises using semi-occluded vocal tracts. Logopedics Phoniatrics Vocology, 40(3), 106-112. https://doi.org/10.3109/14015439.2014.902496

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• Wuyts, F. L., De Bodt, M. S., Molenberghs, G., Remacle, M., Heylen, L., Millet, B., Van Lierde, K., Raes, J., & Van de Heyning, P. H. (2000). The dysphonia severity index: an objective measure of vocal quality based on a multiparameter approach. Journal of Speech, Language, and Hearing Research, 43(3), 796-809. https://doi.org/10.1044/jslhr.4303.796