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Sleep position, autonomic function, and arousal

B C Galland1, G Reeves, B J Taylor

  • 1Department of Paediatrics and Child Health, Otago Medical School, Dunedin, New Zealand. bcgalland@gandalf.otago.ac.nz

Archives of Disease in Childhood. Fetal and Neonatal Edition
|August 26, 1998
PubMed
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Prone sleeping in infants is linked to reduced heart rate variability (HRV) and blunted arousal responses during head-up tilting. These findings suggest potential autonomic impairment in the prone position.

Area of Science:

  • Physiology
  • Infant Health

Background:

  • Heart rate variability (HRV) and arousal responses are crucial indicators of autonomic nervous system function in infants.
  • The prone sleeping position has been associated with an increased risk of sudden infant death syndrome (SIDS).

Purpose of the Study:

  • To compare heart rate variability (HRV) and autonomic responses to head-up tilting in infants sleeping in prone versus supine positions.
  • To investigate the impact of sleep position on infant arousal and heart rate regulation.

Main Methods:

  • Thirty-seven healthy infants (2-4 months) underwent HRV measurement in horizontal position.
  • Infants were subjected to 60-degree head-up tilting, with heart rate and arousal responses recorded during quiet and active sleep in both prone and supine positions.

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Main Results:

  • Reduced HRV was observed in the prone position compared to the supine position across both sleep states.
  • Arousal responses to head-up tilting were significantly blunted in the prone position, particularly during active sleep (15% vs. 54% in supine).
  • Sleep position did not affect heart rate changes during head-up tilting.

Conclusions:

  • The prone sleeping position may be associated with altered autonomic function and impaired arousal mechanisms in infants.
  • Decreased HRV, observed in the prone position, could indicate autonomic impairment and has been linked to adverse infant outcomes, including SIDS.