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Respiratory and motor events in sleeping infants: their correlation with thoracico-abdominal respiratory
Insights
Infant sleep patterns show changes with age, with more sighs and apneas during active (REM) sleep in newborns. These events decrease as babies grow, with individual variations noted.
Area of Science:
- Neonatal physiology
- Sleep science
- Developmental pediatrics
Background:
- Infant sleep is characterized by unique physiological events.
- Understanding these events is crucial for assessing normal development.
Purpose of the Study:
- To investigate the incidence and characteristics of sighs, apneas, and startles during sleep in normal infants.
- To examine the relationship between these events and sleep state, age, and respiratory patterns.
Main Methods:
- Polygraphic recordings were conducted on 28 normal infants (20 newborns, 8 aged 2-10 weeks).
- Sleep states (active/REM and quiet/NREM) were monitored alongside respiratory movements and other physiological parameters.
Main Results:
- Newborns exhibited more sighs and apneas during active (REM) sleep, and startles during quiet (NREM) sleep.
- The frequency of these events decreased with age.
- No consistent correlations were found between apneas and out-of-phase respiration, nor between respiratory patterns and other physiological measures.
Conclusions:
- Sleep-related respiratory events in infants change significantly with maturation.
- Individual variations in event frequency are common.
- The study proposes a hypothesis regarding the underlying neurological mechanisms.
Abstract:
28 polygraphic recordings were made in normal infants: 20 in full-term newborns and 8 in 2- to 10-wk-old babies. In full-term newborns sighs and apneas (greater than 5 sec) were significantly more numerous in active (REM) sleep, while startles prevailed in quiet (NREM) sleep. The incidence of all these events diminished with age. Important interindividual differences of their frequency were noted in normal babies. There were not time correlations between the apneas (decreasing from newborns to 2-10 wk of age) and out-of-phase respiration in active sleep (no changing during the same period). Sighs, apneas, startles and limb movements did not modify phase relationships between thoracic and abdominal movements. Where movements were out of phase, only body movements involving the thorax were followed by transient period with in phase respiratory movements. Coincidences between occurrence of sighs, apneas, startles, gross body movements and respiratory amplitude diminution were calculated. There was no constant parallelism between out-of-phase thoracico-abdominal respiration and tonic chin activity inhibition nor respiratory rate irregularity. A hypothesis on neurological mechanism underlining these phenomena is proposed.