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Sleeping body temperatures in 3-4 month old infants
M P Wailoo1, S A Petersen, H Whittaker
1Department of Child Health, University of Leicester.
Insights
Infant body temperature shows a distinct overnight rhythm, independent of the environment. This endogenous temperature regulation is well-organized in 4-month-old infants.
Area of Science:
- Pediatrics
- Infant physiology
- Thermoregulation
Background:
- Understanding infant thermoregulation is crucial for assessing health and development.
- Previous research has explored infant temperature patterns, but continuous overnight rhythms require further investigation.
Purpose of the Study:
- To investigate the endogenous circadian rhythm of body temperature in normal 3-4 month old infants.
- To determine the relationship between rectal and skin temperature over a prolonged overnight period.
Main Methods:
- Continuous overnight monitoring of rectal, skin, and ambient temperatures in infants' home environments.
- Data analysis focused on temperature patterns relative to sleep onset and time of day.
- Correlation analysis explored the influence of environmental factors (room temperature, wrapping) on infant temperature.
Main Results:
- Rectal temperature initially dropped from above 37°C to a stable 36.4°C within 1.5 hours, then gradually rose, showing a pattern linked to sleep onset rather than time of day.
- Skin temperature exhibited less variation than rectal temperature, with no significant correlation to rectal temperature in the initial two hours of sleep.
- No correlation was found between the extent or rate of temperature fall and environmental thermal conditions.
Conclusions:
- Four-month-old infants possess a well-organized, endogenous rhythm of body temperature.
- Infant thermoregulation is internally driven and not solely dependent on external environmental factors.
Abstract:
Rectal, skin, and ambient temperatures were continuously recorded overnight from 3-4 month old normal infants in their home cots under conditions of room temperature and wrapping chosen freely by parents. It was found that rectal temperature was above 37 degrees C when infants were put down, but fell rapidly to 36.4 degrees C within one and a half hours, then stabilised for a few hours before rising steadily. This pattern was tied more closely to the time of putting down than time of day. The extent and rate of temperature fall did not correlate with any feature of the thermal environment. We also found that skin temperature changed much less than rectal temperature over the night, and for the first two hours in the cot there was no relation between skin and rectal temperature. There is therefore a well organised, endogenous rhythm of temperature in 4 month old infants.