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Modeling development of sleep-wake behaviors. II. Results of two cohorts of preterms
D Holditch-Davis1, L J Edwards
1Department of Health of Women and Children, School of Nursing, University of North Carolina at Chapel Hill, 27599, USA.
Insights
Sleep-wake states in preterm infants show significant developmental changes, with active sleep decreasing and waking states increasing. These stable patterns may help identify neurological issues in infants.
Area of Science:
- Neonatal development
- Sleep science
- Neurodevelopmental pediatrics
Background:
- Preterm infants exhibit unique developmental trajectories.
- Understanding sleep-wake state development is crucial for assessing neurodevelopment.
- High-risk preterm infants require specialized monitoring.
Purpose of the Study:
- To analyze the developmental patterns of sleep-wake states in high-risk preterm infants.
- To determine if these developmental patterns are consistent across different infant cohorts.
- To explore the potential of sleep-wake state patterns as biomarkers for neurological assessment.
Main Methods:
- A mixed general linear model was employed for statistical analysis.
- Two independent cohorts of high-risk preterm infants were studied (n=37 and n=34).
- Developmental changes in sleep-wake states (active sleep, quiet sleep, active waking, quiet waking) were assessed over the preterm period.
Main Results:
- Active sleep decreased, while active waking and quiet waking increased significantly over the preterm period in both cohorts.
- The organization of active and quiet sleep also showed significant increases.
- While quiet sleep increased with age, this was only significant in one cohort.
- Minor effects were observed for infant characteristics; no significant differences in developmental trajectories between cohorts were found.
- Differences in specific sleep variables (e.g., sleep-wake transition, active sleep without REM) were noted between cohorts.
Conclusions:
- Developmental patterns of sleep-wake states are relatively stable during the preterm period.
- Deviations from typical patterns may serve as early indicators of neurological problems in preterm infants.
- This research supports the use of sleep-wake state analysis for neurodevelopmental screening in high-risk neonates.
Abstract:
A mixed general linear model analysis of the development of sleep-wake states was conducted on 37 high-risk preterm infants and replicated with a second cohort of 34 infants. Most dependent variables showed significant development over the preterm period: active sleep decreased, and active waking, quiet waking, and the organization of active sleep and quiet sleep increased over the preterm period in both cohorts. The amount of quiet sleep also increased over age, but this change was significant only for Cohort 1. Seven infant characteristics used as covariates had only minor effects. There were no significant differences in the developmental trajectories (slopes) of the two cohorts. The amounts of four variables differed between cohorts: Cohort 2 infants had less sleep-wake transition, more active sleep, less active sleep without REM, and more regular quiet sleep. These findings suggest that developmental patterns of sleep wake states are stable enough in the preterm period that deviant individual patterns might be used to identify infants with neurological problems.