Article

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 rho=-.547) and distal femur (Spearman rho=-.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.
CI - Copyright (c) 2016 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS