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Coordination of fingertip forces during precision grasping in multiple system atrophy
Lisa M Muratori1, Ralf Reilmann, Andrew M Gordon
1Department of Biobehavioral Science, Teachers College, Columbia University, 525 West 120th Street, New York, NY 10027, USA.
Neuropsychologia
|July 10, 2003
Summary
Multiple system atrophy (MSA) patients exhibit impaired motor control, specifically in grip-lift tasks. Their delayed force coordination suggests a broader deficit in motor function due to neural degeneration.
Area of Science:
- Neuroscience
- Motor Control Research
- Neurology
Background:
- Multiple system atrophy (MSA) is characterized by autonomic dysfunction and parkinsonism, but motor deficits remain poorly understood.
- Existing knowledge focuses on pathology and autonomic nervous system involvement, with limited insight into motor control impairments.
Purpose of the Study:
- To investigate the nature of motor deficits in multiple system atrophy (MSA).
- To examine force coordination during a precision grip-lift task in individuals with MSA.
Main Methods:
- Participants performed a natural grip-lift movement with an instrumented object.
- Force coordination was analyzed during object grasping and lifting phases.
- Grip and load forces were measured in subjects with MSA and healthy controls.
Main Results:
- Subjects with MSA showed a prolonged delay between object contact and lift initiation, increasing with object weight.
- MSA patients produced excessive grip forces before lifting, unlike controls who generated forces in parallel.
- Motor control deficits were observed in both sequential and simultaneous aspects of the grip-lift task.
Conclusions:
- Multiple system atrophy (MSA) is associated with disrupted grasp coordination.
- Findings suggest a generalized motor control deficit in MSA, potentially stemming from multi-focal neural degeneration.