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Impaired anticipatory control of isometric forces during grasping by children with cerebral palsy
A C Eliasson1, A M Gordon, H Forssberg
1Nobel Institute for Neurophysiology, Stockholm, Sweden.
Insights
Children with cerebral palsy (CP) struggle to adjust grip force based on object weight, indicating impaired motor control rather than solely sensory feedback issues. Their force adjustments are less precise and influenced by weight compared to typically developing peers.
Area of Science:
- Neuroscience
- Motor Control
- Developmental Pediatrics
Background:
- Cerebral palsy (CP) often involves motor and sensory deficits.
- Understanding force regulation in children with CP is crucial for rehabilitation.
Purpose of the Study:
- To investigate force regulation during object prehension in children with CP.
- To compare motor control strategies between children with CP and typically developing children.
Main Methods:
- Isometric force output was measured during object lifting tasks.
- Force scaling in response to object weight was analyzed.
- Sensory feedback utilization was assessed when holding objects in the air.
Main Results:
- Children with CP showed stepwise force increases, uninfluenced by object weight, unlike controls.
- While holding objects, children with CP used sensory feedback but with greater force variability.
- Force modulation by object weight was less effective in children with CP compared to controls.
Conclusions:
- Impaired central motor coordination, not just sensory feedback disturbance, is the primary issue in CP's force regulation.
- Children with CP have difficulty integrating sensory information for precise motor output.
- Findings suggest targeted interventions for motor coordination are needed for children with CP.
Abstract:
The authors examined the force regulation during prehension of 12 children with cerebral palsy (CP) and an age-matched control group. The control group appropriately scaled the isometric force output in one force-rate pulse toward the weight of the previously lifted object, but children with CP exhibited stepwise increases in force in which the force amplitudes were not influenced by the object's weight. When the object was held in the air, most children with CP were able to modify their force output according to the object's weight, using sensory feedback, but their forces were more variable than those of the control group and less influenced by the object's weight. Although children with CP have disturbed sensory feedback--likely to lead to an indistinct internal representation of an object's physical properties--their main disability stems from impaired central co-ordination of motor activity.