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Central somatosensory conduction time in severely growth-stunted children
H Hesse1, M F Rivera, I de Díaz
1Department of Physiology, National Autonomous University of Honduras (UNAH), Tegucigalpa, Honduras.
Insights
Chronic malnutrition in children aged 7-8 years did not affect central nervous system conduction time. This suggests that somatosensory tracts are resilient to postnatal dietary deficiencies due to early myelination.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Nutritional Science
Background:
- Chronic malnutrition can impact central nervous system (CNS) development and function.
- Assessing CNS function in malnourished children is crucial for understanding long-term health outcomes.
- Somatosensory evoked potentials (SEPs) offer a non-invasive method to evaluate neural pathway integrity.
Purpose of the Study:
- To investigate the effects of chronic malnutrition on CNS function in school-aged children.
- To measure central conduction time (CCT) in growth-stunted children compared to healthy controls.
- To explore the potential impact of malnutrition on neural myelination and fiber diameter.
Main Methods:
- Utilized somatosensory evoked potential (SEP) testing on 20 growth-stunted children (7-8 years) and 20 controls in Honduras.
- Measured central conduction time (CCT) as the interpeak latency between N13 and N20 after median nerve stimulation.
- Assessed group differences in socioeconomic status, neurointegrative test performance, hematocrit, and birth weight.
Main Results:
- No significant difference in mean CCT was found between the growth-stunted group (6.19 ± 0.52 ms) and the control group (6.30 ± 0.58 ms).
- Groups differed significantly in socioeconomic status, Bender's neurointegrative test scores, and hematocrit levels.
- Birth weight did not show a significant difference between the two groups.
Conclusions:
- Chronic malnutrition in this cohort did not impair central conduction time in somatosensory pathways.
- Results suggest that myelination of somatosensory tracts may be largely complete before the typical onset of significant postnatal malnutrition.
- Somatosensory tracts might be protected from damage due to postnatal dietary deficiencies due to their developmental timeline.
Abstract:
To examine the effects of chronic malnutrition on central nervous system function, we used the somatosensory evoked potential to measure the central conduction time of 20 children aged 7-8 y with heights below the third percentile for their age and 20 control children in Honduras. The two groups differed significantly in socioeconomic status, achievement in Bender's neurointegrative test, and hematocrit, but not in birth weight. After median nerve stimulation, the mean central conduction time (interpeak latency between N13 and N20) for the growth-stunted group (6.19 +/- 0.52 ms) did not differ significantly from that of the control subjects (6.30 +/- 0.58 ms), suggesting appropriate myelination and fiber diameter. Somatosensory tracts may escape damage resulting from postnatal dietary deficiencies because myelination in these tracts is almost complete at birth.