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Interactions between sleeping position and feeding on cardiorespiratory activity in preterm infants

William P Fifer1, Michael M Myers, Rakesh Sahni

  • 1Department of Psychiatry, Columbia College of Physicians and Surgeons, Sackler Institute for Developmental Psychobiology, New York State Psychiatric Institute, New York, USA.

Developmental Psychobiology
|October 28, 2005
PubMed

Insights

Prone sleeping increases sudden infant death syndrome (SIDS) risk in preterm infants. Cardiorespiratory responses to feeding interact with sleep position, suggesting risk varies with time after feeding.

Area of Science:

  • Neonatal physiology
  • Cardiorespiratory regulation

Background:

  • Prone sleeping is a risk factor for sudden infant death syndrome (SIDS).
  • Cardiorespiratory activity is influenced by both sleep position and feeding in infants.

Purpose of the Study:

  • To investigate the combined effects of sleep position (prone vs. supine) and post-feeding intervals on cardiorespiratory activity in preterm infants.
  • To understand how autonomic responses to feeding modulate cardiorespiratory control during sleep in vulnerable infants.

Main Methods:

  • Studied 20 preterm infants (31-36 weeks postconceptional age) in prone and supine sleep positions.
  • Recorded heart rate, respiratory rate, and variability patterns during interfeed intervals.
  • Analyzed data using repeated measures analyses of variance to assess effects of position and time after feeding.

Main Results:

  • Significant effects of both sleeping position and time after feeding were observed.
  • Prone sleeping was associated with higher heart rate and lower heart period variability compared to supine.
  • These positional effects on cardiac function were most pronounced in the middle of the interfeed interval.

Conclusions:

  • Autonomic responses to nutrient processing interact with sleep position to affect cardiorespiratory control in preterm infants.
  • The risk associated with prone sleeping may not be constant but can vary depending on the infant's feeding schedule.

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