Review of the Impact of Voice Training on the Vocal Quality of Professional Voice Users: Implications for Vocal Health and Recommendations for Further Research
Accepted 13 August 2009. published online 08 February 2010. Corrected Proof
Summary
Objective
To review the current published available research into the impact of voice training on the vocal quality of professional voice users, to provide implications for vocal health and recommendations for further research.
Design
Literature review with a systematic approach.
Methods
A systematic search of the literature was conducted using electronic databases and the following defined search terms: occupational voice or occupational dysphonia or voice and occupational safety and health. To obtain the comprehensive relevant literature, no studies were excluded on the basis of study design. In total, 10 studies that investigated the impact of a voice training intervention on the vocal quality of professional voice users as a potential prevention strategy for voice disorders were selected for this review.
Results
The 10 studies ranged in design from observational to randomized controlled trials with mainly small sample sizes (N=11–60). Nine studies showed that voice training significantly (P<0.05) improved at least one voice-related measurement from the several investigated from baseline. Five studies reported that voice training significantly (P<0.05) improved at least one measurement compared with no training.
Conclusions
Findings indicate that there is no conclusive evidence that voice training improves the vocal effectiveness of professional voice users, as a result of a range of methodological limitations of the included studies. However, some studies did show that voice training significantly improved the knowledge, awareness, and quality of voice. Therefore, there is a need for robust research to empirically confirm this, with implications for vocal health, and occupational safety and health policies.
*School of Communication, University of Ulster, Newtownabbey, Northern Ireland, United Kingdom
†School of Health Sciences, University of Ulster, Newtownabbey, Northern Ireland, United Kingdom
Address correspondence and reprint requests to D.E. Hazlett, School of Communication, University of Ulster, Shore Road, Newtownabbey BT37 0QB, Northern Ireland, United Kingdom.
Conflicts of interest: The authors declare that they have no conflicts of interest.
ABSTRACT
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