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Enhancing spontaneous recovery after stroke: a randomized controlled trial.
Winston D Byblow1,2, Maxine J Shanks1,2, Benjamin Scrivener2,3
1School of Exercise, Sport and Rehabilitation Sciences, University of Auckland, Auckland 1142, New Zealand.
Brain Communications
|April 23, 2026
Summary
High-dose, high-intensity virtual exploratory movement (VEM) therapy did not significantly improve upper limb recovery early after stroke compared to conventional therapy. Gains observed were likely due to spontaneous biological recovery and time, not the specific intervention.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Biomedical Engineering
Background:
- Early upper limb recovery after stroke is crucial for functional independence.
- High-dose, high-intensity (HDHI) therapies are being explored to maximize motor function gains.
- Virtual reality technologies offer novel platforms for delivering intensive rehabilitation.
Purpose of the Study:
- To evaluate the efficacy of HDHI virtual exploratory movement (VEM) therapy compared to conventional therapy (CoT) for upper limb recovery in early stroke.
- To assess the impact of VEM on motor function, dexterity, kinematics, and neurophysiological measures.
- To identify factors influencing therapy dose achievement and outcomes in the early post-stroke period.
Main Methods:
- A Phase IIa, randomized controlled trial involving 64 participants within 2 weeks of stroke.
- Intervention groups received 90 minutes of daily upper limb therapy for 3 weeks: VEM or CoT, in addition to usual care.
- Primary endpoint: change in Action Research Arm Test (ARAT) score at 3 months. Secondary outcomes included Fugl-Meyer assessment (FM-UE), dexterity, kinematics, and TMS measures.
Main Results:
- No significant difference in the primary endpoint (ARAT change) between VEM and CoT groups in intention-to-treat (ITT) or per-protocol (PP) analyses.
- No significant group differences or interactions for secondary outcomes in the PP analysis.
- Significant improvements over time were observed in FM-UE and ARAT scores, consistent with spontaneous recovery and time effects, irrespective of the intervention group.
Conclusions:
- HDHI VEM therapy did not demonstrate superior efficacy over CoT for early upper limb stroke recovery.
- Achieving high doses of therapy was challenging due to patient- and clinician-related factors.
- Future research may need to consider optimal timing for HDHI interventions, potentially in the later sub-acute phase, and address barriers to dose delivery.
