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Impaired force coordination during object release in children with hemiplegic cerebral palsy
1Department of Woman and Child Health, Karolinska Institute.
Insights
Children with cerebral palsy (CP) struggle with releasing objects, showing prolonged, uncoordinated grips. Their force control during release is impaired, unlike in typical development.
Area of Science:
- Neuroscience
- Pediatrics
- Rehabilitation Medicine
Background:
- Hand motor control is crucial for fine dexterity in children.
- Studies on cerebral palsy (CP) often focus on grasping and lifting, neglecting object release.
- Understanding object release deficits is vital for children with hemiplegic CP.
Purpose of the Study:
- To examine fingertip force coordination during object replacement and release in children with hemiplegic CP.
- To compare motor control during release between children with hemiplegic CP and typically developing children.
Main Methods:
- 14 children with hemiplegic CP and 14 typically developing children (7-13 years) participated.
- Participants replaced and released objects of 200 g and 400 g.
- Fingertip grip and load forces were measured during the release phase.
Main Results:
- Children with hemiplegic CP exhibited abrupt object replacement but prolonged, uncoordinated grasp release.
- Grip and load forces decreased sequentially in children with CP, unlike controls.
- All children scaled force decrease rates based on object weight, indicating preserved sensory feedback processing.
Conclusions:
- Children with hemiplegic CP demonstrate significant impairments in the coordinated release of objects.
- Deficits in sequential force modulation during release contribute to impaired hand skills in hemiplegic CP.
- This study highlights the need for targeted interventions addressing object release in pediatric CP rehabilitation.
Abstract:
Recent studies on hand motor control in children with cerebral palsy (CP) have focused on the coordination of fingertip forces during the grasping and lifting of objects. However, little is known about the ability to replace and release an object from grasp, a function that is just as important for fine dexterity. The present study examines the coordination of fingertip forces during the replacement and release of an object (either 200 g or 400 g) from grasp in 14 children (aged between 7 and 13 years) with hemiplegic CP and in 14 age-matched typically developing children. The results indicate that children with hemiplegic CP abruptly replaced the object but had a prolonged and uncoordinated release of the grasp. Unlike what was seen in the control children, the grip and load forces decreased sequentially in the children with CP. However, all the children could appropriately scale the rate of force decrease based on somatosensory weight-related information from the ongoing lift. The results provide further information about the impaired hand skills in children with hemiplegic CP.