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Body position, sleep states, and cardiorespiratory activity in developing low birth weight infants
R Sahni1, K F Schulze, S Kashyap
1Department of Pediatrics, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA. rs62@columbia.edu
Insights
Prone positioning in infants with low birth weight (LBW) significantly alters cardiorespiratory activity during sleep compared to supine positioning. These findings highlight the importance of body position for infant cardiorespiratory regulation.
Area of Science:
- Neonatal physiology
- Cardiorespiratory regulation
- Sleep studies
Background:
- Growing low birth weight (LBW) infants exhibit unique cardiorespiratory patterns.
- Understanding sleep-related cardiorespiratory control is crucial for infant health.
- The impact of body position on these patterns requires further investigation.
Purpose of the Study:
- To investigate the effects of body position (supine vs. prone) on cardiorespiratory activity during quiet and active sleep in growing LBW infants.
- To evaluate the influence of postconceptional age on cardiorespiratory activity in different sleep positions.
Main Methods:
- Fifty-one healthy LBW infants (26-37 weeks gestational age) were studied.
- Infants were randomly assigned to supine or prone positions for 3-hour intervals.
- Continuous cardiorespiratory activity and sleep state were monitored, measuring heart rate (HR), heart period variability (RR-SD), respiratory rate (f), and respiratory variability (fSD).
Main Results:
- LBW infants demonstrated higher HR and f, with lower RR-SD and fSD in the prone position compared to the supine position during both quiet and active sleep.
- Increasing postconceptional age amplified positional differences in HR during quiet sleep and RR-SD during both sleep states.
Conclusions:
- Systematic differences in cardiorespiratory control exist based on body position during sleep in LBW infants.
- These positional variations may be linked to autonomic control mechanisms.
- Such differences could potentially influence susceptibility to sudden infant death syndrome (SIDS).
Abstract:
The objective of this study was to determine the effects of body position (supine vs prone) on cardiorespiratory activity during quiet and active sleep in growing low birth weight (LBW) infants. The effect of postconceptional age on cardiorespiratory activity in the two positions was also evaluated. Fifty-one healthy, growing, appropriate for gestational age LBW infants (795-1600 g), ranging from 26-37 weeks in gestational age, were evaluated. All subjects were enrolled in an ongoing study of the effects of quality of dietary energy on the rate and composition of weight gain. Infants were randomly assigned to the supine or prone position for the first 3 h of the 6-h studies; the position was reversed for the second 3 h. Continuous recordings of cardiorespiratory activity were performed along with simultaneous minute by minute assignment of behavioral sleep state. Measurements of heart rate (HR), heart period variability (RR-SD), respiratory rate (f), and respiratory variability (fSD) were made each minute. Low birth weight infants had higher HR and f and lower RR-SD and fSD in the prone position compared to the supine position, during both quiet and active sleep. With increasing postconceptional age, positional differences in HR increased during quiet sleep and differences in RR-SD increased during both sleep states. These data demonstrate systematic differences in cardiorespiratory control related to body position during sleep. We speculate that such positional differences are due to variations in autonomic control, and may, in turn, contribute to variations in susceptibility to sudden infant death syndrome.