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Quantification of cocontraction in spastic cerebral palsy
A J Ikeda1, M F Abel, K P Granata
1University of Virginia, USA.
Electromyography and Clinical Neurophysiology
|December 8, 1998
Summary
Antagonist cocontraction limits net moment production in children with spastic diplegic cerebral palsy (CP). This cocontraction, especially during extension, is greater in children with CP, contributing to their observed weakness.
Area of Science:
- Biomechanics
- Neuroscience
- Pediatric Rehabilitation
Background:
- Spastic diplegic cerebral palsy (CP) often involves muscle coactivation, potentially affecting motor function.
- Understanding antagonist cocontraction is crucial for characterizing muscle dysfunction in CP.
Purpose of the Study:
- To investigate the role of antagonist cocontraction in limiting net moment production in children with CP.
- To determine if cocontraction varies with joint angle in children with and without CP.
Main Methods:
- Collected surface EMG and moment data from quadriceps and hamstrings during isometric exertions in children with CP and controls.
- Developed and validated a biomechanical model to quantify antagonist cocontraction.
- Defined cocontraction as the percentage of net moment negated by antagonist muscle activity.
Main Results:
- Children with CP demonstrated greater antagonist cocontraction during extension compared to typically developing children.
- This increased cocontraction in CP is associated with observed extension weakness.
- Cocontraction varied significantly with joint angle in both groups during flexion and in controls during extension.
Conclusions:
- Antagonist cocontraction is a significant factor contributing to reduced net moment production and weakness in children with spastic diplegic cerebral palsy.
- Quantifying cocontraction offers potential for improved characterization of spastic muscle dysfunction and clinical management in CP.