Eight weeks of focal muscle vibration shows improvements in muscle co-ordination and co-contraction in cerebral palsy children: a randomized control trial.
Moeez Ashfaque, Kiran Khushnood, Ganesh R Naik and 3 others
Eight weeks of muscle vibration added to standard physiotherapy produced only very small, short-lived changes in leg muscle activation in children with spastic diplegic CP.
The authors themselves call the results hypothesis-generating; this does not yet change clinical practice.
Key findings
1Most between-group comparisons for muscle activation, fatigue, and co-contraction were non-significant; the few post-hoc differences that reached significance (e.g., 100 Hz above control for left tibialis anterior at 4 and 8 weeks) had small effect sizes (Cohen's d below 0.25).
2All three groups received the same standardized physical therapy (positioning, stretching, strengthening, gait training, three sessions per week for 8 weeks); the vibration groups additionally received focal muscle vibration to six lower-limb muscles before each PT session, so the between-group difference reflects the add-on effect of vibration on top of PT.
3The authors state that, given the unblinded control condition and the study's limited statistical power, the frequency-specific differences should be regarded as hypothesis-generating and need confirmation in adequately powered, sham-controlled trials.
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What it does not show
The control group was not blinded: children in the control arm could see that no vibration device was being applied, which the authors acknowledge could inflate the apparent benefit of vibration through expectation effects. The study was underpowered: 65 children were recruited against a calculated requirement of 96, and 16 were lost before the 8-week assessment, leaving uneven group sizes (20, 10, 19). All reported effect sizes were small (Cohen's d below 0.25 for activation, below 0.30 for fatigue measures), meaning the practical difference a child would feel is likely minimal. The 12-week retention check was performed on only 27 of the 49 completers, so the follow-up data are not representative of the full cohort. The vibration dose (4.5 minutes per muscle, 30 minutes per limb) was lower than the 10 minutes per muscle used in prior studies that reported larger spasticity reductions, so the true effect of a higher dose is unknown. Outcomes were limited to surface EMG measures of activation, fatigue, and co-contraction during a laboratory dorsiflexion task; no functional outcomes such as gait speed, balance, or daily-activity measures were reported. A single physiotherapist delivered all vibration sessions, which limits whether the results would replicate with a different clinician or device placement. The study was conducted at two sites in Pakistan; generalisability to other populations and settings is untested.
Declared interests
Funded by the Royal Academy of Engineering. No company that manufactures or sells the vibration device is named as a funder, and no author declares a financial interest in the device. The device was custom-built by the research team.
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