http://www.maneyonline.com/doi/abs/10.1310/tsr2105-391
Author Affilations
Abstract
Background:
Vibration therapy may be used to help cortical reorganization after
stroke as it can cause different adaptive metabolic and mechanical
effects. Objective: This study examined whether the application
of mechano-acoustic vibration on upper limb muscles could induce changes
in range of motion (ROM), function, pain, and grip strength in
individuals with chronic stroke. Methods: Out of 52 individuals
post stroke with upper limb spasticity who were eligible,16 received
mechano-acoustic vibration therapy (ViSS device) 3 times weekly for 12
sessions. The frequency of vibration was set to 300 Hz for 30 minutes.
The treated muscles were the extensor carpi radialis longus and brevis
and triceps brachii during voluntary contraction. All participants were
evaluated in both upper limbs before (T0) and at the end (T1) of
treatment with a dynamometer (hand grip strength), Modified Ashworth
Scale, QuickDASH, FIM score, Fugl-Meyer scale, Verbal Numerical Rating
Scale of pain, and Jebsen-Taylor Hand Function Test. Results:
After 4 weeks, hand grip power had improved and pain and spasticity had
decreased. Improvements were recorded for all parameters and were
considered statistically significant. Conclusions: Application of
vibratory stimuli to a muscle can increase the motor-evoked potential
recorded from the muscle, suggesting an enhancement of corticospinal
excitability. Low amplitude, high-frequency vibration treatment (300 Hz)
can significantly decrease tone and pain and improve strength in upper
limb of hemiplegic individuals, when applied for 30 minutes, 3 times a
week over 4 weeks.
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