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Postural control in sitting children with cerebral palsy
E Brogren1, M Hadders-Algra, H Forssberg
1Dept. of Woman and Child Health, Karolinska Institute, Stockholm, Sweden.
Insights
Children with cerebral palsy (CP) exhibit conserved postural adjustment patterns but show specific muscle coordination dysfunctions. These altered patterns in ventral muscles offer potential therapeutic targets for improving postural stability.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Rehabilitation Medicine
Background:
- Children with cerebral palsy (CP) often experience significant postural problems that impede daily activities.
- Understanding the neural control of posture in CP is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the neural mechanisms underlying postural adjustments in children with spastic diplegia CP.
- To identify specific dysfunctions in muscle coordination during postural tasks in CP.
Main Methods:
- Assessed postural adjustments in ten school-age children with spastic diplegia CP and non-disabled controls.
- Utilized horizontal forward and backward displacements of a movable platform to elicit postural responses.
- Analyzed muscle coordination patterns, particularly in ventral muscles, during translational perturbations.
Main Results:
- Children with CP demonstrated direction-specific postural adjustments, similar to controls, indicating conserved basic coordination patterns.
- Significant dysfunctions were observed in the modulation of ventral muscle responses during forward translations.
- These dysfunctions included stereotyped muscle activation, abnormal top-down recruitment, and excessive co-activation of antagonistic muscles.
Conclusions:
- The fundamental pattern of muscle coordination for posture is preserved in children with CP, despite functional deficits.
- Altered muscle coordination in ventral muscles, characterized by non-variable activation and abnormal recruitment, points to specific neural control impairments.
- Postural instability in CP may involve both primary neurological deficits and compensatory mechanisms, with the latter offering avenues for therapeutic intervention.
Abstract:
Children with cerebral palsy (CP) display postural problems, largely interfering with daily life activities. Clarification of neural mechanisms controlling posture in these children could serve as a base for more successful intervention. Studies on postural adjustments following horizontal forward and backward displacements of a movable platform in ten school-age children with spastic diplegia and non-disabled controls revealed that sitting CP children, like standing CP children, show direction specific postural adjustments, indicating that the basic pattern of muscle coordination in these conditions is conserved. Dysfunctions are especially present in the modulation of the response pattern of ventral muscles during forward translations. They consist of: (1) a stereotyped and non-variable activation of all ventral muscles; (2) an abnormal top-down muscle recruitment; and (3) an excessive degree of antagonistic co-activation. The altered patterns of muscle coordination could be the result of two interacting mechanisms, the primary deficit due to the early brain damage and a compensation due to the postural instability. Especially the latter dysfunction furnishes opportunities for therapeutic help.