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Updated: Aug 18, 2026

Event-related Potentials During Target-response Tasks to Study Cognitive Processes of Upper Limb Use in Children with Unilateral Cerebral Palsy
Published on: January 11, 2016
[Changes in the monosynaptic reflex during wakefulness and sleep of children with cerebral paralysis]
Insights
Children with spastic cerebral palsy show altered H reflex patterns during sleep compared to normal children. This suggests impaired supraspinal inhibitory control in spasticity.
Area of Science:
- Neuroscience
- Pediatrics
- Sleep Medicine
Context:
- Cerebral palsy (CP) is a group of disorders affecting movement and posture.
- Sleep disturbances are common in children with CP.
- The H reflex, a measure of spinal reflex excitability, can be influenced by sleep state and supraspinal input.
Purpose:
- To investigate changes in the H reflex amplitude during different sleep stages in children with cerebral palsy.
- To compare these changes with those observed in typically developing children.
Summary:
- H reflex amplitude progressively decreases from wakefulness to REM sleep in normal children.
- In spastic CP, the H reflex shows only a slight decrease in NREM sleep and no significant change in REM sleep, with amplitudes consistently higher than controls.
- Children with dystonic or hypotonic CP exhibit H reflex patterns similar to controls.
Impact:
- Findings suggest an altered balance of supraspinal regulatory systems in spastic CP, likely due to reduced functionality of inhibitory structures.
- This research provides insights into the neurophysiological underpinnings of spasticity during sleep.
- Highlights potential differences in sleep-related spinal reflex modulation across CP subtypes.
Abstract:
Changes of the H reflex during sleep were studied in 13 children with cerebral palsy (8 with spastic tetraplegia, 2 with a mixed form of cerebral palsy without spasticity, 3 with hypotonic diplegia or tetraplegia). These modifications were compared with those of 5 normal children of the same age. During repeated night recordings, responses in the calf muscle elicited by electrical stimuli to the posterior tibial nerve were studied at the same time as the EEG, EOG and EMG of the mental muscles. The results show that:--in normal children the max H reflex progressively decreases in amplitude from wakefulness to REM sleep; -- in spastic patients there is only a slight decrease in the H reflex in NREM sleep and no significant change in REM sleep; the amplitude of the H reflex is always greater than that in the control group; -- in the dystonic and hypotonic group the results obtained are similar to those of the control group. From these results one may draw the conclusion that in spastic patients as opposed to the control, dystonic and hypotonic groups, normal balance between the function of supraspinal systems regulating the amplitude of the spinal reflexes is alterated probably through the scarce functionality of the supraspinal inhibitory structures.
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