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Quantitative assessment of mirror movements after stroke
G Nelles1, S C Cramer, J D Schaechter
1Department of Neurology, Massachusetts General Hospital, Boston, USA. gereon.nelles@uni-essen.de
Stroke
|June 17, 1998
Summary
Mirror movements (MM) are involuntary movements seen in stroke patients. MM in the unaffected hand correlate with greater motor deficits, while MM in the paretic hand indicate better motor function, aiding stroke recovery insights.
Area of Science:
- Neuroscience
- Motor Control
- Rehabilitation Science
Background:
- Mirror movements (MM) are involuntary, synchronous movements of one limb during voluntary unilateral action of the contralateral limb.
- Understanding MM in stroke patients is crucial for assessing motor deficits and recovery.
Purpose of the Study:
- To measure mirror movements (MM) in stroke patients and healthy controls.
- To evaluate the relationship between MM and motor function after stroke.
Main Methods:
- Twenty-three stroke patients and 16 controls participated.
- A computerized dynamometer measured hand movements during squeezing tasks.
- Motor deficits were assessed using the Fugl-Meyer scale.
Main Results:
- Mirror movements in the unaffected hand were observed in 70-78% of stroke patients during paretic hand squeezing.
- This incidence was significantly higher than in controls, except for the dominant hand.
- MM in the unaffected hand correlated with greater motor deficits, while MM in the paretic hand correlated with better motor function.
Conclusions:
- Simultaneous recording of both hands precisely characterizes mirror movements.
- MM in unaffected and paretic hands are linked to different motor deficit levels post-stroke.
- Evaluating MM can offer insights into stroke recovery mechanisms.