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The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors
Published on: May 2, 2021
Changing motor synergies in chronic stroke
L Dipietro1, H I Krebs, S E Fasoli
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. lauradp@mit.edu
Journal of Neurophysiology
|June 8, 2007
Summary
Stroke recovery involves refining abnormal movement synergies, not eliminating them. Robotic therapy enhances independent joint control, improving functional arm movements in chronic stroke survivors.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Biomechanics
Background:
- Vertebrate movements rely on motor synergies.
- Impaired synergy execution hinders functional motor performance.
- Abnormal synergies in stroke patients indicate neurological deficits and loss of independent joint control.
Purpose of the Study:
- Characterize training-related changes in motor synergies from movement kinematics.
- Assess if these changes reflect recovery extent.
- Determine if recovery involves augmenting or extinguishing abnormal synergies.
Main Methods:
- Utilized a robotic therapy device for training and analysis.
- Analyzed paretic arm movements in 117 chronic stroke survivors.
- Assessed kinematic metrics and clinical Fugl-Meyer scale scores.
Main Results:
- Subjects showed improved independent shoulder and elbow joint control in untrained tasks.
- Observed kinematic changes suggest alterations in motor synergies.
- These kinematic metrics correlated significantly with Fugl-Meyer scale recovery.
Conclusions:
- Robotic therapy promotes a 'tuning' or augmentation of existing abnormal synergies, rather than extinction.
- This process contributes significantly to motor recovery in chronic stroke.
- Improved independent joint control is a key indicator of recovery post-stroke.
