Nerve Stimulation Enhances Task-Oriented Training in Chronic, Severe Motor Deficit After Stroke: A Randomized Trial

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Peripheral nerve stimulation (PNS) is a sensory-based intervention.
• PNS has shown potential in enhancing motor training outcomes for stroke survivors with mild-to-moderate hemiparesis.
• Further research is needed to determine its efficacy in cases of severe impairment.

Purpose of the Study:

• To investigate the effectiveness of active peripheral nerve stimulation paired with intensive task-oriented training in individuals with chronic, severe poststroke hemiparesis.
• To assess the impact of this combined intervention on upper extremity motor function.

Main Methods:

• A randomized controlled trial involving 36 subjects with chronic, severe poststroke hemiparesis.
• Participants received 10 daily sessions of either active or sham peripheral nerve stimulation (2 hours) preceding intensive task-oriented training (4 hours).
• Upper extremity function was evaluated using Fugl-Meyer Assessment, Wolf Motor Function Test, and Action Research Arm Test at baseline, post-intervention, and 1-month follow-up.

Main Results:

• The active stimulation group demonstrated statistically significant improvements compared to the sham group on the Fugl-Meyer Assessment, Wolf Motor Function Test, and Action Research Arm Test at both post-intervention and 1-month follow-up.
• Active PNS was associated with significant within-group benefits across all outcome measures at 1-month follow-up.
• Improvements in the active stimulation group exceeded minimal detectable and clinically significant differences for at least one outcome measure at multiple time points.

Conclusions:

• Active peripheral nerve stimulation, when paired with intensive task-oriented training, can significantly improve upper extremity motor function in individuals with severe hemiparesis after stroke.
• Further confirmatory studies with larger sample sizes and longer follow-up periods are warranted.
• This intervention strategy holds promise for enhancing motor recovery in severely affected stroke survivors.