A Short and Distinct Time Window for Recovery of Arm Motor Control Early After Stroke Revealed With a Global Measure of Trajectory Kinematics.
Juan C Cortes, Jeff Goldsmith, Michelle D Harran and 7 others
PMID 28506149WHAT IT FOUND
Arm motor control recovery plateaued by 5 weeks post-stroke, while strength and clinical scores continued improving through one year.
This suggests spontaneous biological recovery is largely complete early, whereas later gains likely reflect strength or compensation.
Key findings
01Motor control, measured by kinematic trajectory distance from healthy norms, showed significant improvement only in the first 5 weeks, with no significant change thereafter.
02Clinical measures (FMA-UE, ARAT) and biceps strength continued to improve significantly from week 5 through week 54, contrasting with the motor control plateau.
03The dissociation between motor control and clinical recovery suggests that later improvements in standard scales may reflect strength gains or compensation rather than restored motor control.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The sample size was small (18 participants), limiting the ability to detect subtle differences in recovery trajectories based on initial severity. Participants were highly selected (first-time ischemic stroke, no hemorrhage, no visual field deficits), so findings may not apply to the broader stroke population. The study used a specific 2-D reaching task; results may not generalize to 3-D movements or tasks requiring anti-gravity strength. Hand and wrist movements were splinted out, so the study only assessed shoulder and elbow motor control.
Declared interests
The text does not explicitly state funding sources or conflicts of interest in the provided sentences.
The easy way to misread this
Do not interpret continued improvement in FMA-UE or ARAT scores after 5 weeks as evidence that motor control is still recovering. The study shows motor control plateaus early, so later gains likely reflect strength or compensation, not restored biological control.