SUMMARY
Introduction
Combining mechanical vibration stimulation with resistance training to improve neuromuscular
performance is a method that has gained popularity in the field of sports sciences.
Purpose
To evaluate the immediate and mid-term effects of mechanical vibration stimulation
(G-Life NL3000) of the larynx associated to vocal exercises.
Method
Fourteen professional voice users divided into: Experimental Group – Seven participants who performed a 20-minute exercise protocol with humming applying
mechanical vibration stimulation (G-Life NL3000) of the larynx once a day for 30 days;
Control Group – Seven participants who performed only the 20-minute exercise protocol with humming.
For comparison purposes, the evaluation was carried out pre-stimulation, immediately
after simulation (post) and 30 days after stimulation (late-post).
Results
The Experimental Group showed a statistically significant progress in the post-immediate
evaluation and in the post-treatment evaluation for maximum phonation time (*P = < 0.001), Jitter (*P = 0.008), Shimmer (*P = 0.005), noise-to-harmonics ratio (*P = 0.005). In the GRBASI scale, the Experimental Group showed significant results
in the post-treatment evaluation for Grade (*P = 0.005), Roughness (*P = 0.008), Breathiness (*P = 0.018) and Instability (*P = 0.018). A self-perception voice questionnaire showed better voice quality (*P= 0.031) and easier phonation (*P = 0.005) in the Experimental Group.
Conclusion
Mechanical vibration stimulation of the larynx associated to humming produced positive
changes in the vocal pattern and significantly improvement in short and mid-term vocal
quality for participants in this study.
KEY WORDS
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Article info
Publication history
Published online: January 22, 2021
Accepted:
December 15,
2020
Identification
Copyright
© 2020 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
