Resting motor threshold in the course of hand motor recovery after stroke: a systematic review.
Jitka Veldema, Dennis Alexander Nowak, Alireza Gharabaghi
PMID 34732203WHAT IT FOUND
High resting motor threshold in the stroke-affected hemisphere tracks with severe hand disability.
As hand function recovers, this threshold drops. The unaffected hemisphere's threshold showed no consistent link to impairment or recovery.
Key findings
01Ipsilesional resting motor threshold correlates with hand motor disability at baseline and follow-up, with higher thresholds indicating greater impairment.
02Favorable hand motor recovery over time is associated with a decrease in ipsilesional resting motor threshold.
03Contralesional resting motor threshold showed no significant correlation with either hand motor disability or recovery.
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 review included 92 studies with vastly different methods, including 17 different hand motor assessments and 13 different target muscles for TMS. Time since stroke varied widely from less than one day to 16 years, mixing acute, subacute, and chronic recovery phases. Screening was performed by only one reviewer, increasing the risk of selection bias. The included studies varied in design, mixing cross-sectional and longitudinal observational and interventional trials.
The easy way to misread this
Do not interpret the correlation between resting motor threshold and hand function as evidence that manipulating threshold directly causes recovery. The review describes an association between neurophysiological state and behavioral outcome, not a proven therapeutic mechanism.