Related Experiment Video
Updated: Aug 1, 2026
Transcutaneous Microcirculatory Imaging in Preterm Neonates
Published on: December 31, 2015
Preterm infants born at less than 31 weeks' gestation have improved growth in cycled light compared with continuous
Debra H Brandon1, Diane Holditch-Davis, Michael Belyea
1Duke University School of Nursing, Duke Perinatal Research Institute, Durham, North Carolina 27710, USA.
Insights
Cycled light (CL) exposure in neonatal intensive care units benefits preterm infants by promoting faster weight gain compared to near darkness (ND). Early CL introduction shows significant health advantages for premature babies.
Area of Science:
- Neonatal care
- Developmental pediatrics
- Environmental influences on infant health
Background:
- Preterm infants (<31 weeks' gestational age) face significant health challenges.
- The impact of light environments on neonatal outcomes is an area of ongoing research.
Purpose of the Study:
- To evaluate the health benefits of cycled light (CL) compared to near darkness (ND) in preterm infants.
- To determine optimal timing for introducing CL in neonatal intensive care.
Main Methods:
- A randomized, interventional study design was employed.
- Infants were assigned to three groups: CL from birth, CL at 32 weeks' postconceptional age (PCA), or CL at 36 weeks' PCA.
- Statistical analyses included segmented mixed general linear models and chi-squared tests.
Main Results:
- Infants exposed to CL from birth or at 32 weeks' PCA demonstrated accelerated weight gain compared to those with delayed CL introduction.
- No significant differences were observed in hospitalization duration or ventilator days across groups.
- Low statistical power limited definitive conclusions on secondary outcomes.
Conclusions:
- Cycled light offers substantial weight gain benefits for preterm infants compared to near darkness.
- Early introduction of cycled light (from birth or 32 weeks' PCA) appears advantageous for neonatal growth.
- Near darkness does not provide short-term health advantages over cycled light for this vulnerable population.
Objectives:
Our purpose was to evaluate the benefits of cycled light (CL) versus near darkness (ND) on health in preterm infants born at <31 weeks' gestational age.
Study Design:
Randomized, interventional study comparing infants receiving (1) CL from birth, (2) CL at 32 weeks' postconceptional age (PCA), and (3) CL at 36 weeks' PCA in transition for discharge home. Statistical significance was assessed with segmented mixed general linear models, analysis of covariance, general estimating equations, chi(2), and Fisher's exact procedure.
Results:
Infants receiving CL at birth and 32 weeks' PCA gained weight faster than infants not receiving CL until 36 weeks' PCA. There were no differences among the groups in length of hospitalization stay or number of ventilator days, but the power was low for these variables.
Conclusions:
These findings suggest that CL has significant weight gain benefits over ND, and there are no short-term advantages of ND over cycled light for health in preterm infants.
