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Beyond Clinical Signs: The Interplay Between Vagal Tone and Lethargic Behavior in Preterm Infants
Vania Aldrete-Cortez1,2, Liz Catano-Cedillo1, Mario Enrique Rendón-Macías3
1Laboratory of Neuroscience and Cognitive Development, School of Psychology, Universidad Panamericana, Mexico City, Mexico.
Developmental Neuropsychology
|March 11, 2025
Summary
Low vagal tone in preterm infants is linked to increased lethargy and stress indicators. This suggests potential autonomic nervous system dysregulation impacting neurodevelopment.
Area of Science:
- Neonatal Medicine
- Developmental Neuroscience
- Autonomic Nervous System Research
Background:
- Preterm infants often exhibit neurobehavioral challenges.
- Vagal tone, a marker of autonomic nervous system function, is crucial for development.
- Understanding the link between vagal tone and lethargy is important for early intervention.
Purpose of the Study:
- To investigate the association between vagal tone and lethargy in preterm infants.
- To explore other neurobehavioral correlates of vagal tone in this population.
Main Methods:
- Cross-sectional, observational study design.
- Involved thirteen low-risk preterm infants.
- Utilized behavioral assessments and high-frequency heart-rate variability (HF-HRV) for vagal tone measurement.
Main Results:
- A lower vagal tone cluster was significantly associated with greater lethargy (p=0.05).
- Lower vagal tone also correlated with reduced handling and excitability.
- Higher skin and central nervous system stress indicators were observed in the lower vagal tone group, though not statistically significant.
Conclusions:
- Lower vagal tone may indicate autonomic nervous system dysregulation or immaturity in preterm infants.
- This dysregulation can lead to neurobehavioral issues like lethargy.
- Findings suggest potential for further neurodevelopmental difficulties if not addressed.
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