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[Evolution of gross body movements during sleep in healthy infants aged from 1 to 4 months]
M F Vecchierini-Blineau1, B Nogues, S Louvet
1Laboratoire de Physiologie, Faculté de Médecine, Nantes, France.
Insights
Newborn body motility decreases with age and differs across sleep states. Generalized movements are more frequent in active (AS) and indeterminate (IS) sleep than quiet sleep (QS).
Area of Science:
- Neonatal sleep research
- Developmental pediatrics
- Infant motor control
Context:
- Understanding infant development requires characterizing motor activity during sleep.
- Sleep states significantly influence generalized gross body movements in newborns.
- Age-related changes in motility patterns are crucial for developmental assessments.
Purpose:
- To investigate how sleep states and infant age influence the evolution of body motility.
- To quantify generalized gross body movements during day-sleep polygraphic recordings in infants.
- To analyze age-dependent variations in movement frequency, duration, and distribution across sleep states.
Summary:
- Generalized gross body movements were significantly higher in active (AS) and indeterminate (IS) sleep compared to quiet sleep (QS).
- Movement frequency and duration per sleep hour decreased with infant age.
- Longer movements (>10 sec) decreased with age in IS and AS, while most movements lasted 5-10 sec.
Impact:
- Provides normative data on infant body motility across sleep states and age groups.
- Highlights developmental changes in motor control during early infancy.
- Suggests potential challenges in comparing findings due to varied movement recording techniques.
Abstract:
To assess the evolution of body motility according to sleep states and age in young children, we performed day-sleep polygraphic recordings in 45 normal and full-term newborn infants, grouped according to age: 5 to 7 weeks, 9 to 11 weeks, 13 to 15 weeks of age. Generalized gross body movements were only studied. Our results showed that generalized movements varied according to sleep states and also according to age. The number of movements, in each age-group was significantly higher in active (AS) and indeterminate (IS) sleep than in quiet sleep (QS). This work also found that the distribution of the number of movements differed between sleep states. In AS, movements were equally distributed whereas in quiet sleep 40% of movements occurred during the last three minutes of a stage. Our results also showed that the mean number of movements per sleep hour, the mean duration of body movements and the percentage of time spent with movements significantly decreased with age. The distribution of the number of movements as a function of duration, showed that most of them lasted from 5 to 10 sec in each age-group of infants, whatever the sleep state; however, the number of the longest movements, lasting more than 10 sec, significantly decreased with age in IS and AS. These results were difficult to compare with those already published in the literature because of the different techniques for recording body movements; so it seemed impossible to use normal values established by other authors.