Modeling Upper Limb Rehabilitation-Induced Recovery After Stroke: The Role of Attention as a Clinical Confounder.
Silvia Salvalaggio, Simone Gambazza, Martina Andò and 10 others
PMID 39385459WHAT IT FOUND
In stroke patients receiving about 1.5 hours of daily therapy, the amount of rehabilitation did not predict upper limb recovery.
Baseline motor function was the only significant predictor. Attention levels confounded the results, suggesting cognitive status may mask rehabilitation effects.
Key findings
01Rehabilitation dose was not associated with final upper limb motor function scores after controlling for baseline function, independence, stroke severity, and attention.
02Baseline upper limb motor function was the only statistically significant factor associated with recovery, explaining over half of the variation in outcomes.
03Patients with impaired attention had lower predicted upper limb scores than those with preserved attention, though this difference did not reach statistical significance.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study was underpowered, with only 40 participants, which limits the ability to detect small but potentially real effects of rehabilitation dose. The dose of rehabilitation was normalized to a 40-day equivalent, which may not accurately reflect the actual intensity or timing of therapy received. The FMA-UE scale has a ceiling effect and may not be sensitive to changes in patients with higher baseline function. Missing data for MRI and TMS assessments reduced the sample size for neurophysiological analyses, limiting conclusions about brain structure or function. The observational design cannot establish causality; patients with better prognosis may have been prescribed different therapy doses.
Declared interests
The study was funded by the Italian Ministry of Health. The funders provided salaries for authors or covered project expenses but had no role in study design, data collection, analysis, or manuscript preparation.
The easy way to misread this
Do not conclude that rehabilitation dose is ineffective for upper limb recovery. The null finding may be due to the low sample size and the specific dose range studied, rather than a true lack of benefit. The study suggests dose was not a significant predictor *after controlling for baseline function and attention*, not that therapy itself does not work.