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Breathing, sleep state, and rectal temperature oscillations
D M Tappin1, R P Ford, K P Nelson
1Community Paediatric Unit, HealthLink South, Christchurch, New Zealand.
Insights
Infant rectal temperature and breathing patterns mature together in the first six months. These changes in sleep state and thermoregulation are crucial for infant health and safety.
Area of Science:
- Pediatrics
- Infant Physiology
- Sleep Medicine
Background:
- Overheating is a risk factor for infant mortality, including Sudden Infant Death Syndrome (SIDS).
- Understanding normal infant physiological patterns is essential for identifying potential risks.
Purpose of the Study:
- To examine the relationship between rectal temperature and breathing patterns in healthy infants during their first six months of life.
- To investigate how these patterns change with infant maturation and sleep states.
Main Methods:
- Continuous overnight rectal temperature and breathing recordings were collected from 21 infants over 429 nights.
- Sleep states were determined using respiratory variables, with 'regular' breathing identified as a marker for 'quiet' sleep.
- Data were analyzed to correlate temperature fluctuations with sleep and breathing state changes.
Main Results:
- The duration and proportion of 'quiet' sleep increased significantly from two weeks to three months of age.
- Rectal temperature typically fell during 'quiet' sleep and rose during rapid eye movement (REM) sleep.
- Temperature oscillations were directly associated with shifts in sleep and breathing states.
Conclusions:
- Maturation of rectal temperature patterns in infants is closely linked to the development of sleep and breathing patterns.
- These findings highlight the dynamic interplay between thermoregulation, sleep, and respiration in early infancy.
- Regular breathing is a reliable indicator of quiet sleep in infants.
Abstract:
Overheating may cause terminal apnoea and cot death. Rectal temperature and breathing patterns were examined in normal infants at home during the first 6 months of life. Twenty one infants had continuous overnight rectal temperature and breathing recordings for 429 nights (mean 20.4 nights, range 7-30) spaced over the first six months of life. Periods when breathing was 'regular' were directly marked on single night records. Sleep state was determined from respiratory variables. 'Regular' breathing was a reliable marker of 'quiet' sleep (specificity 93%). The duration of 'quiet' sleep increased from 6 to 22 minutes from two weeks to three months of age and then remained static, as did the proportion of sleep spent in the quiet phase (9% to 34%). Rectal temperature fell during 66% of quiet sleep and usually rose during rapid eye movement (REM) sleep. The drop in rectal temperature was maximal at the start of quiet sleep, whereas the maximum rise during REM sleep was reached after 10 to 15 minutes. Oscillations in rectal temperature are associated with changes in sleep and breathing state. The maturation of rectal temperature patterns during the first six months of life are closely related to a maturation of sleep state and breathing patterns.