Reaching kinematics to measure motor changes after mental practice in stroke

Area of Science:

• Neurorehabilitation
• Motor Control
• Biomechanical Analysis

Background:

• Stroke survivors often experience upper limb hemiparesis, impacting daily activities.
• Mental practice (MP) is a potential therapeutic intervention for motor recovery.
• Objective quantification of motor changes is crucial for evaluating MP efficacy.

Purpose of the Study:

• To evaluate the effectiveness of mental practice (MP) in improving upper limb function after stroke.
• To utilize a novel kinematics model for precise measurement of motor changes.
• To assess MP's impact on activities of daily living (ADLs) performance.

Main Methods:

• A pre-post case series design involving 5 chronic stroke patients with upper limb hemiparesis.
• Participants underwent 6 weeks of therapy focusing on ADLs, followed by MP sessions.
• 3-D motion analysis (kinematics) measured reaching distance, hand velocity, and joint range of motion.

Main Results:

• Significant improvement in the "reach up" horizontal reaching distance (p <.001).
• Improvements observed in "reach out" horizontal reaching distance and shoulder/elbow range of motion.
• No significant changes in linear hand velocity were detected.

Conclusions:

• Kinematics provides an objective and precise method for quantifying MP-induced motor improvements.
• Mental practice demonstrates potential in enhancing affected arm reaching capabilities in stroke patients.
• MP may be a valuable adjunct therapy for improving functional motor outcomes post-stroke.