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Self-Reported Fatigue and Bioenergetic Pathways Secondary to Interventions for Vocal Fatigue: A Feasibility Study.

Chaya Guntupalli Nanjundeswaran1, Jessie VanSwearingen2

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Summary

Vocal fatigue interventions, including voice therapy and cardiovascular training, show promise for teachers. Both methods improved vocal fatigue symptoms and recovery, but personalized approaches are needed due to varied responses.

Keywords:
Vocal fatigue—Voice therapy—Cardiovascular conditioning—VFI—Gas exchange.

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Area of Science:

  • Speech and Hearing Sciences
  • Exercise Physiology
  • Occupational Health

Background:

  • Vocal fatigue affects 18-33% of teachers, impacting their professional performance and quality of life.
  • Understanding the metabolic and self-perceptual factors is crucial for developing effective interventions.
  • Previous research has not fully explored the comparative efficacy of different intervention strategies.

Purpose of the Study:

  • To investigate the mechanisms of vocal fatigue in teachers.
  • To assess the effectiveness of cardiovascular conditioning and voice production exercises.
  • To explore the differential impact of interventions on high and low vocal fatigue groups.

Main Methods:

  • 22 female teachers were divided into high and low vocal fatigue groups based on the Vocal Fatigue Index (VFI).
  • Participants completed a 4-week intervention program (cardiovascular conditioning or voice therapy).
  • Outcomes measured included VFI scores, perceived effort, metabolic costs, and vocal task recovery times.

Main Results:

  • Voice therapy improved VFI factors 1 and 2 (tiredness, avoidance, discomfort) and loud speaking effort.
  • Cardiovascular training improved VFI factor 3 (tiredness with recovery) and conversational speaking effort.
  • Both interventions increased metabolic costs and shortened recovery times, indicating a shift towards aerobic energy utilization.

Conclusions:

  • Interventions should be personalized based on individual bioenergetic and self-perceptual profiles.
  • Vocal fatigue is a heterogeneous condition requiring tailored treatment strategies.
  • Further research is needed to refine outcome measures and understand aerobic/anaerobic contributions.