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The Journal of Neuroscience, September 15, 2002, 22(18):8297-8304

Movement Smoothness Changes during Stroke Recovery

Brandon Rohrer¹, Susan Fasoli¹, Hermano Igo Krebs¹, Richard Hughes³, Bruce Volpe⁴, Walter R. Frontera³, Joel Stein³, and Neville Hogan^{1, 2}

Departments of ¹ Mechanical Engineering and ² Brain and Cognitive Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, ³ Spaulding Rehabilitation Hospital, Boston, Massachusetts 02114, and ⁴ Department of Neurology and Neuroscience, Weill Medical College of Cornell University, Burke Medical Research Institute, White Plains, New York 10605

Smoothness is characteristic of coordinated human movements, and stroke patients' movements seem to grow more smooth with recovery. We used a robotic therapy device to analyze five different measures of movement smoothness in the hemiparetic arm of 31 patients recovering from stroke. Four of the five metrics showed general increases in smoothness for the entire patient population. However, according to the fifth metric, the movements of patients with recent stroke grew less smooth over the course of therapy. This pattern was reproduced in a computer simulation of recovery based on submovement blending, suggesting that progressive blending of submovements underlies stroke recovery.

Key words: stroke recovery; submovements; smoothness; segmentation; robotic therapy; minimum-jerk; blending

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Copyright © 2002 Society for Neuroscience  0270-6474/02/22188297-08$05.00/0

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