Priming and task-specific training for arm weakness post stroke: A randomized controlled trial

Area of Science:

• Neurorehabilitation
• Stroke Recovery
• Motor Control

Background:

• Upper limb impairment is a common challenge after stroke.
• Task-specific training (TST) is a key component of stroke rehabilitation.
• Novel priming techniques aim to enhance motor recovery.

Purpose of the Study:

• To investigate if bilateral upper limb motor priming (BUMP) enhances TST outcomes compared to control priming (CP) in chronic stroke.
• To evaluate the impact of BUMP + TST versus CP + TST on upper limb motor function.

Main Methods:

• A single-blind, randomized controlled trial involving 76 adults with chronic stroke and moderate to severe upper limb hemiparesis.
• Participants received either BUMP or CP followed by 30 hours of TST over 6 weeks.
• The primary outcome was the change in Fugl-Meyer upper extremity (FMUE) score at 8-week follow-up.

Main Results:

• Both BUMP + TST and CP + TST groups showed significant improvements in FMUE scores, exceeding the minimum clinically important difference.
• No significant difference in FMUE change was observed between the BUMP and CP groups (mean difference -0.20).
• Clinically meaningful response rates (≥6-point FMUE change) were similar: 46% for BUMP and 50% for CP.

Conclusions:

• BUMP did not provide additional benefits to TST for upper limb motor recovery in chronic stroke.
• The observed improvements were primarily attributed to TST, demonstrating its effectiveness.
• TST alone, even with a shorter duration, achieved significant and clinically meaningful outcomes, comparable to more intensive interventions.