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Oxygen consumption and neonatal sleep states.
The Journal of Physiology
|May 1, 1978
Summary
Newborn infants consume more oxygen during rapid eye movement (REM) sleep than non-rapid eye movement (NREM) sleep. This difference is amplified by mild cold stress, impacting infant metabolism and thermoregulation.
Area of Science:
- Neonatal physiology
- Sleep science
- Metabolic studies
Background:
- Infant sleep states are critical for development.
- Oxygen consumption (V(O2)) reflects metabolic rate.
- Understanding neonatal metabolic responses during sleep is crucial for clinical care.
Purpose of the Study:
- To compare oxygen consumption during REM and NREM sleep in newborns.
- To investigate the influence of thermal environment on neonatal V(O2) during sleep states.
- To analyze V(O2) changes over time within sleep states.
Main Methods:
- Full-term infants were studied in a metabolism chamber.
- Oxygen consumption was measured during REM and NREM sleep.
- Experiments were conducted in neutral and cool thermal environments.
Main Results:
- Mean V(O2) was significantly higher during REM sleep (5.97 ml.kg(-1).min(-1)) compared to NREM sleep (5.72 ml.kg(-1).min(-1)).
- The difference in V(O2) between sleep states increased from 6.6% in a neutral to 14.9% in a cool environment.
- V(O2) gradually decreased over time in NREM sleep in a neutral environment, but not in REM sleep or in a cool environment.
Conclusions:
- Newborns exhibit higher metabolic rates during REM sleep.
- Thermal stress significantly elevates V(O2) differences between sleep states in neonates.
- Sleep state and thermal environment interact to influence neonatal metabolic rate.