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Acoustic Effects of Vocal Warm-Up: A 7-Week Longitudinal Case Study

  • Adrián Castillo-Allendes
    Affiliations
    Department of Communicative Sciences and Disorders, Michigan State University, East Lansing, Michigan
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  • Lady Catherine Cantor-Cutiva
    Affiliations
    Department of Collective Health, Faculty of Nursing, Universidad Nacional de Colombia, Bogotá, Colombia

    Speech and Language Pathology Program, Universidad Manuela Beltrán, Bogotá, Colombia
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  • Eric J. Hunter
    Correspondence
    Address correspondence and reprint requests to Eric Hunter, Department of Communicative Sciences and Disorders, Michigan State University, Communicative Sciences and Disorders, Michigan State University, 1026 Red Cedar Road, Room 109. East Lansing, MI 48824.
    Affiliations
    Department of Communicative Sciences and Disorders, Michigan State University, East Lansing, Michigan
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Published:November 26, 2021DOI:https://doi.org/10.1016/j.jvoice.2021.09.030

      Summary

      Objective

      A case study was used to determine which acoustic parameters would be sensitive to a SOVT-based vocal warm-up over the duration of a standard voice treatment.

      Methods

      The longitudinal research design consisted of repeated voice measures during 7 weeks from a single subject, a 48-year-old male occupational voice user with a history of voice disorders. A steady phonation and running speech tasks were performed before and after an intensive 1-minute water-resistance voice exercise (WRT). Acoustic assessment of the pre-and postrecordings from each session was obtained with freely accessible software (e.g., Audacity, PRAAT) and acoustic measures (e.g., fundamental frequency, jitter, shimmer, alpha ratio, NHR, HNR, L1L0, Cepstral Peak Prominence smoothed).

      Results

      After WRT, the analysis indicated that jitter, shimmer, and NHR had a small but statistically significant decrease, while alpha ratio, CPPS, and HNR had a statistically significant increase. For the days where there were six repetitions, there was a larger effect in the later repetitions in the day for some metrics (i.e., alpha ratio, shimmer, NHR, CPPS), while others had the biggest effect in the first two repetitions in a day (i.e., jitter, HNR).

      Conclusions

      A short vocal water-resistance voice task had a positive effect on the short-term acoustic voice metrics after each repetition of the exercise, independent of the number of repetitions throughout the day. When five repetitions of this exercise routine occurred, there was a more substantial influence on the proportion of acoustic voice changes.

      Key Words

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