Summary
Objectives
A whole body vibration platform using vertical oscillation has been shown to be efficacious
in reducing vocal fatigue in adults. This study aimed to investigate whether this
platform-generated whole body vibration was unique in reducing vocal fatigue by comparing
it with self-generated whole body vibration.
Methods
Twenty-four female adults (mean age = 23.96 years) were randomly assigned to one of
the following three groups: a machine-generated whole body vibration group (N = 8),
a self-generated whole body vibration group (N = 8), and a placebo vocal resting group
(N = 8). All participants performed a karaoke singing task for at least 95 minutes.
Each participant received 10 minutes of platform-generated vibration, self-vibration,
or sham localised vibration (placebo group with basically voice rest only), according
to their group allocation. Vocal function ability, measured by the highest fundamental
frequency produced, and a self-reported vocal fatigue score were evaluated at three
time points: baseline (prefatigue), after the singing task (post-fatigue) and post-vibration.
Results
The study revealed that machine-generated whole body vibration was significantly better
at improving vocal fatigue than self-generated whole body vibration or voice rest.
Conclusion
The findings support previous research that machine-generated whole body vibration
is effective in reducing vocal fatigue. The non-significant results of self-generated
whole body vibration in terms of relieving vocal fatigue suggest that inadequate vibration
frequency or amplitude together with leg muscle fatigue may have been the main factor
of ineffectiveness.
Key Words
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Article info
Publication history
Published online: March 07, 2021
Accepted:
January 21,
2021
Identification
Copyright
© 2021 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
