Abstract
Objective
To determine the degree to which a high-frequency, low-magnitude vibration signal
emitted by a floor-based platform transmits to the distal tibia and distal femur of
children with spastic cerebral palsy (CP) during standing.
Design
Cross-sectional study.
Setting
University research laboratory.
Participants
Children with spastic CP who could stand independently (n=18) and typically developing
children (n=10) (age range, 4–12y) participated in the study (N=28).
Interventions
Not applicable.
Main Outcome Measures
The vibration signal at the high-frequency, low-magnitude vibration platform (approximately
33Hz and 0.3g), distal tibia, and distal femur was measured using accelerometers. The degree of
plantar flexor spasticity was assessed using the Modified Ashworth Scale.
Results
The high-frequency, low-magnitude vibration signal was greater (P<.001) at the distal tibia than at the platform in children with CP (.36±.06g vs .29±.05g) and controls (.40±.09g vs .24±.07g). Although the vibration signal was also higher at the distal femur (.35±.09g, P<.001) than at the platform in controls, it was lower in children with CP (.20±.07g, P<.001). The degree of spasticity was negatively related to the vibration signal transmitted
to the distal tibia (Spearman ρ=−.547) and distal femur (Spearman ρ=−.566) in children
with CP (both P<.05).
Conclusions
A high-frequency, low-magnitude vibration signal from a floor-based platform was amplified
at the distal tibia, attenuated at the distal femur, and inversely related to the
degree of muscle spasticity in children with spastic CP. Whether this transmission
pattern affects the adaptation of the bones of children with CP to high-frequency,
low-magnitude vibration requires further investigation.
Keywords
List of abbreviations:
CP (cerebral palsy), GMFCS (Gross Motor Function Classification System), MAS (Modified Ashworth Scale)To read this article in full you will need to make a payment
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Article Info
Publication History
Published online: September 18, 2015
Footnotes
Supported by the National Institutes of Health (grant nos. HD071397 ).
Clinical Trials Registration No.: NCT01803464.
Disclosures: none.
Identification
Copyright
© 2016 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
