Effects of integrated volitional control electrical stimulation (IVES) on upper extremity function in chronic stroke.

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke survivors often experience chronic hemiparesis, impacting upper extremity motor function.
• Restoring hand and wrist function is crucial for independence in daily activities.
• Current rehabilitation strategies may have limitations for patients in the chronic stage.

Purpose of the Study:

• To evaluate the efficacy of a novel electromyogram (EMG)-controlled electrical stimulation system, the integrated volitional control electrical stimulator (IVES).
• To assess the impact of IVES on upper extremity motor function recovery in patients with chronic hemiparetic stroke.

Main Methods:

• Ten participants with chronic hemiparetic stroke (over 12 months post-stroke) received IVES treatment targeting wrist and finger extensors for 6 hours/day over 5 days.
• Assessments included the upper extremity Fugl-Meyer motor assessment (FMA), active range of motion (A-ROM), nine-hole peg test (NHPT), and surface EMG recordings before and after intervention.

Main Results:

• Significant improvements were observed in upper extremity FMA scores (50.8 to 56.8, P < 0.01).
• Active range of motion for wrist extension significantly increased (36.0° to 45.0°, P < 0.01).
• The nine-hole peg test performance significantly improved (85.3 to 63.3, P = 0.04), and EMG showed better muscle coactivation ratios.

Conclusions:

• A short, 5-day treatment course with the IVES system led to significant improvements in upper extremity motor function.
• IVES demonstrates potential as an effective tool for rehabilitation in chronic hemiparetic stroke patients.
• The system's EMG-controlled nature may facilitate volitional control and enhance motor recovery outcomes.