Performance-Based Robotic Training in Individuals with Subacute Stroke: Differences between Responders and...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Upper limb motor recovery after stroke shows high variability with robotic training (RT).
• Understanding differences in patient responses to RT is crucial for optimizing rehabilitation strategies.
• Subacute stroke patients often undergo RT combined with conventional therapies.

Purpose of the Study:

• To investigate differences in baseline characteristics and robotic training (RT) dose between responders and non-responders in subacute stroke.
• To identify factors influencing upper limb motor recovery in patients undergoing RT.

Main Methods:

• Compared baseline characteristics and Fugl-Meyer Assessment (FMA) scores between responders (ΔFMA ≥ 9) and non-responders (n=16).
• Analyzed RT dose parameters: practice time (%), movements performed, and distance covered (cm) in assisted and unassisted modalities.
• Assessed 16 RT sessions in subacute stroke patients (mean 54 days poststroke).

Main Results:

• No significant differences in baseline characteristics or FMA scores between responders and non-responders.
• Non-responders increased RT practice time, movements, and distance, particularly in assisted modalities.
• Responders decreased assisted modality practice while increasing unassisted movements and distance, indicating adaptive difficulty engagement.

Conclusions:

• Non-responders showed no motor improvement despite increased RT dose, suggesting the difficulty level may have been insufficient.
• Adaptive engagement with RT difficulty, particularly in unassisted modalities, is associated with better upper limb motor recovery.
• Future research should incorporate robot-based parameters to define RT dose for optimizing recovery in stroke survivors, especially those with moderate-to-severe arm paresis.