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Somatosensory Plasticity in Hemiplegic Cerebral Palsy Following Constraint Induced Movement Therapy
Cecilia Jobst1, Samantha J D'Souza2, Natasha Causton3
1Program in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, Ontario, Canada.
Insights
Constraint-induced movement therapy (CIMT) enhanced with sensory input improved both motor skills and somatosensory function in children with hemiplegic cerebral palsy (HCP). This therapy also showed positive effects on brain responses in the affected hand.
Area of Science:
- Neuroscience
- Pediatric Rehabilitation
- Movement Science
Background:
- Children with hemiplegic cerebral palsy (HCP) often have significant upper limb motor and somatosensory impairments.
- Constraint-induced movement therapy (CIMT) is known to improve motor function, but its effects on somatosensory deficits are less understood.
Purpose of the Study:
- To assess changes in somatosensory perception and associated brain activity in children with HCP.
- To evaluate the impact of a somatosensory-enhanced CIMT protocol on these functions.
Main Methods:
- A cohort of children with HCP participated in a somatosensory-enhanced CIMT program.
- Clinical assessments of somatosensory and motor function, along with magnetoencephalography (MEG) to measure somatosensory evoked fields (SEF), were performed pre- and post-intervention.
Main Results:
- Significant improvements were noted in tactile registration, hand function (QUEST, Jebsen-Taylor Hand Function Test), and the Assisting Hand Assessment.
- Magnetoencephalography revealed a significant increase in SEF peak amplitude in the affected hand post-intervention.
Conclusions:
- A somatosensory-enhanced CIMT program can improve both clinical somatosensory function and neural processing in the primary somatosensory cortex of children with HCP.
- Further research with larger, controlled studies is recommended to confirm these findings.
Background:
Children with hemiplegic cerebral palsy (HCP) experience upper limb somatosensory and motor deficits. Although constraint-induced movement therapy (CIMT) improves motor function, its impact on somatosensory function remains underinvestigated.
Objective:
The objective of this study was to evaluate somatosensory perception and related brain responses in children with HCP, before and after a somatosensory enhanced CIMT protocol, as measured using clinical sensory and motor assessments and magnetoencephalography.
Methods:
Children with HCP attended a somatosensory enhanced CIMT camp. Clinical somatosensory (tactile registration, 2-point discrimination, stereognosis, proprioception, kinesthesia) and motor outcomes (Quality of Upper Extremity Skills [QUEST] Total/Grasp, Jebsen-Taylor Hand Function Test, grip strength, Assisting Hand Assessment), as well as latency and amplitude of magnetoencephalography somatosensory evoked fields (SEF), were assessed before and after the CIMT camp with paired sample t-tests or Wilcoxon signed-rank tests.
Results:
Twelve children with HCP (mean age: 7.5 years, standard deviation: 2.4) participated. Significant improvements in tactile registration for the affected (hemiplegic) hand (Z = 2.39, P = 0.02) were observed in addition to statistically and clinically significant improvements in QUEST total (t = 3.24, P = 0.007), QUEST grasp (t = 3.24, P = 0.007), Assisting Hand Assessment (Z = 2.25, P = 0.03), and Jebsen-Taylor Hand Function Test (t = -2.62, P = 0.03). A significant increase in the SEF peak amplitude was also found in the affected hand 100 ms after stimulus onset (t = -2.22, P = 0.04).
Conclusions:
Improvements in somatosensory clinical function and neural processing in the affected primary somatosensory cortex in children with HCP were observed after a somatosensory enhanced CIMT program. Further investigation is warranted to continue to evaluate the effectiveness of a sensory enhanced CIMT program in larger samples and controlled study designs.
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