Localized 100 Hz vibration improves function and reduces upper limb spasticity: a double-blind controlled study.

Area of Science:

• Neurology
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Spasticity is a common motor disorder following neurological injury.
• Non-pharmacological interventions are sought to manage spasticity.
• Vibration therapy has shown potential in controlling spasticity.

Purpose of the Study:

• To investigate if selective vibration of the triceps brachii (antagonist muscle) reduces biceps brachii spasticity.
• To compare the efficacy of vibration combined with physiotherapy versus physiotherapy alone.
• To assess the duration of the vibration's effect on spasticity and function.

Main Methods:

• Randomized double-blind study involving 30 hemiplegic patients with upper limb spasticity.
• Intervention group received physiotherapy plus 100 Hz vibration to the triceps brachii.
• Control group received physiotherapy plus sham vibration.
• Treatment duration was 2 weeks, with assessments at baseline, after 1 week, and after 2 weeks.

Main Results:

• The vibration plus physiotherapy group showed statistically significant greater improvements in spasticity compared to the sham vibration group.
• Improvements were observed at both 1-week and 2-week assessment points.
• Significant functional improvements were also noted in the vibration group.

Conclusions:

• 100 Hz vibration of the triceps brachii, when used with physiotherapy, effectively reduces biceps brachii spasticity.
• This combined approach is superior to physiotherapy alone for controlling spasticity and enhancing function.
• The positive effects on spasticity and function persist for at least 48 hours post-vibration, indicating a role in rehabilitation.