Effect of focal muscle vibration on sEMG activity during repeated elbow movements in healthy adults.
Carmen Cabezaolias, Rafael Raya, Cristina Sanchez and 2 others
PMID 41316364WHAT IT FOUND
Vibrating the biceps for five minutes significantly reduced triceps muscle activity during elbow movements in healthy adults.
This inhibition lasted up to 20 minutes. The effect was transient and did not persist at 25 or 30 minutes. These results suggest a specific window for priming subsequent therapy.
Key findings
01Focal muscle vibration applied to the biceps brachii significantly reduced antagonist triceps brachii activity, measured by surface electromyography, immediately after application and for up to 20 minutes.
02The inhibitory effect was transient, as no significant differences in muscle activity were found between the vibration and control sessions at 25 or 30 minutes post-application.
03Control sessions with rest only showed no significant changes in triceps activity over time, confirming that the reduction in the intervention group was due to vibration rather than fatigue or repeated movement.
STILL TO COME
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What it does not show
The study was conducted only on healthy adults, so it is unknown if the timing and magnitude of the effect are the same for patients with neurological conditions or spasticity. Only one vibration protocol (120 Hz, 1.2 mm amplitude for 5 minutes) was tested, so the effects of different frequencies, durations, or intensities are not known. The outcome was a physiological measure of muscle activity, not a measure of functional improvement or clinical outcome. The study did not assess the long-term effects of repeated vibration sessions or whether the effect persists across multiple applications.
Declared interests
The article text provided does not include a specific declaration of competing interests or funding sources.
The easy way to misread this
Do not assume that focal muscle vibration will produce the same 20-minute window of antagonist inhibition in patients with stroke or cerebral palsy. The study was conducted on healthy adults, and altered neural pathways in clinical populations may change the duration or presence of this effect.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →