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Published on: January 11, 2016
Quantification of object manipulation in children with cerebral palsy
M G Wright1, L P Hunt, O H Stanley
1Institute of Child Health, Bristol University, UK.
Insights
Children with cerebral palsy showed altered movement patterns in a shape-posting task. Kinematic analysis quantified these differences, suggesting increased movement uncertainty in cerebral palsy, which repetition helped to reduce.
Area of Science:
- Motor Control
- Developmental Pediatrics
- Biomechanical Analysis
Background:
- Children with cerebral palsy (CP) exhibit motor control deficits affecting object manipulation.
- Quantifying kinematic differences in children with CP is crucial for understanding task performance.
- Previous research highlights challenges in fine motor skills for individuals with CP.
Purpose of the Study:
- To quantify kinematic differences in object manipulation tasks between children with and without cerebral palsy.
- To investigate the impact of object shape complexity and task repetition on motor performance.
- To identify kinematic variables that can effectively differentiate motor control in children with CP.
Main Methods:
- A shape-posting task involving conical, cylindrical, and triangular objects was administered to control, hemiplegic, and diplegic children.
- Kinematic variables including adjustment inefficiency, mean transport velocity, and placing phase adjustments were measured.
- Each object was posted three times with preferred and non-preferred hands.
Main Results:
- Total task time increased with cerebral palsy and object complexity, and decreased with repetition.
- Four kinematic variables explained a significant portion of the variation in task time.
- Children with cerebral palsy exhibited increased adjustment inefficiency and reduced mean transport velocity compared to controls.
Conclusions:
- Kinematic analysis provides a sensitive method for quantifying motor control differences in children with cerebral palsy.
- Increased adjustment inefficiency and reduced transport velocity in CP may reflect heightened intrinsic movement uncertainty.
- Task repetition can mitigate some motor control challenges associated with cerebral palsy.
Abstract:
A shape-posting task was studied in 30 control, eight hemiplegic and 10 diplegic children, to determine how differences in object manipulation between such children could be quantified. Conical, cylindrical and triangular-shaped objects were posted through a hole in a perspex screen, three times each with both preferred and non-preferred hands. Four variables were defined to describe kinematic aspects of the task: adjustment inefficiency, mean transport velocity, adjustment distance to be completed in the placing phase and adjustment velocity in the placing phase. As expected, total task time was increased in subjects with cerebral palsy and with more complex shapes, and reduced by repetition. The four kinematic variables reduced the variation in task time between individual children by 79%, between sets of like objects by 62%, and the residual variation by 63%. Adjustment inefficiency was increased and mean transport velocity reduced in subjects with cerebral palsy, whereas repetition had the opposite effect. It is suggested that combined alterations in adjustment inefficiency and transport velocity reflect changes in the intrinsic uncertainty of a movement and that this quantity is decreased by repetition and increased in cerebral palsy.
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