Resting-state Alpha Reactivity Is Reduced in Parkinson's Disease and Associated With Gait Variability.
Ellen Lirani-Silva, Layla C S Silva, Diego Orcioli-Silva and 4 others
PMID 40552872WHAT IT FOUND
People with Parkinson's showed reduced EEG alpha reactivity, linked to greater gait variability.
However, this brain measure was not specific to Parkinson's; the difference disappeared when accounting for global cognitive scores.
Key findings
01Alpha reactivity was significantly reduced in people with Parkinson's disease compared to healthy controls, showing a moderate effect size.
02The difference in alpha reactivity between groups was no longer significant when controlling for Mini-Mental State Examination scores.
03Across the whole sample, lower alpha reactivity was associated with higher variability in stance time, step velocity, step time, and step length.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study was cross-sectional and small, limiting causal inference. Participants were tested only in the ON state of medication, and medication dose was not recorded, so its effect on EEG could not be controlled. Cognition was assessed only with a global screening tool (Mini-Mental), not specific cognitive domains. The lack of specificity to Parkinson's (disappearing when controlling for cognition) means alpha reactivity may reflect general cognitive decline rather than PD pathology.
Declared interests
The authors declared no potential conflicts of interest. The research was supported by the Sao Paulo Research Foundation (FAPESP) and CAPES.
The easy way to misread this
Do not interpret reduced alpha reactivity as a specific biomarker for Parkinson's disease. The study found that this difference was driven by global cognitive scores, meaning it likely reflects general cognitive status rather than PD-specific pathology.
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 →