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Activity patterns assessed throughout 24-hour recordings in preterm and near term infants
F Giganti1, G Cioni, E Biagioni
1Department of Psychology, University of Florence, Italy.
Insights
Infant motility patterns evolve before birth, with increasing quiet periods and a distinct day-night cycle emerging in the final weeks. This developmental shift indicates enhanced self-regulation in late-term fetuses.
Area of Science:
- Neonatal development
- Fetal movement analysis
- Neurobehavioral pediatrics
Background:
- Understanding fetal development is crucial for assessing infant health.
- Motility patterns provide insights into neurological maturation.
- Limited data exists on detailed motility changes in late preterm infants.
Purpose of the Study:
- To characterize the motility patterns of low-risk infants approaching term.
- To investigate the influence of age and circadian rhythms on fetal movements.
- To identify developmental changes in motility during the final weeks before birth.
Main Methods:
- Continuous 24-hour motility recording in 10 low-risk infants (34-40 weeks postmenstrual age).
- Classification of motility into four distinct codes based on intensity and behavior.
- Analysis of motility changes related to postmenstrual age and time of day (day vs. night).
Main Results:
- Motility was categorized into four codes, ranging from quiescence to vigorous movement with crying.
- A significant increase in quiescent periods (code 1) was observed with advancing postmenstrual age.
- Higher motility levels were recorded during nighttime compared to daytime, indicating a developing circadian rhythm.
Conclusions:
- The final weeks before term are characterized by an increased ability to maintain quiet behavior.
- Infants demonstrate a reorganization of day-night motility distribution as they approach full term.
- These findings highlight significant neurobehavioral maturation and self-regulation development in late-gestation fetuses.
Abstract:
The motility of 10 low-risk infants, aged between 34 and 40 weeks of postmenstrual age, has been continuously recorded for 24 h. Four codes were distinguished: code 1 (absence of motility or occasional occurrence of startles), code 2 (presence of small general or isolated body movements, startles, smiles, grimaces, and other facial activity), code 3 (forceful and prolonged general movements, startles, and stretches), code 4 (vigorous and abrupt general body movements accompanied by crying). Changes with age concern mainly the increase of the duration of code 1 (quiescence) episodes. Confrontation between day and night showed higher levels of motility during the night than during the day. The last weeks before term represent a time for increase in the ability to sustain a quiet behavior and to reorganize day-night motility distribution.