Related Experiment Videos
Impact of gestational age on preterm motor development at 4 months chronological and adjusted ages
1Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Canada.
Insights
Preterm infant motor development, including tone and volitional movement, appears driven by biological maturity. Primitive reflexes and automatic reactions may be influenced by both maturity and extrauterine experience.
Area of Science:
- Neonatal development
- Pediatric neurology
- Developmental pediatrics
Background:
- Preterm infants face unique developmental trajectories.
- Understanding factors influencing motor development in preterm infants is crucial for early intervention.
- Distinguishing between biological maturity and environmental influences on development is complex.
Purpose of the Study:
- To investigate whether motor development in low-risk preterm infants is primarily determined by biological maturity or duration of extrauterine experience.
- To compare neuromotor assessments at chronological and adjusted ages in preterm infants.
Main Methods:
- Prospective cohort study of 62 low-risk preterm infants.
- Infants stratified by gestational age (<32 weeks vs. >=32 weeks).
- Neuromotor assessments at 4 months chronological and 4 months adjusted ages.
Main Results:
- At 4 months chronological age, significant differences between groups in tone, primitive reflexes, and volitional movement.
- At 4 months adjusted age, significant differences between groups only in primitive reflexes.
- Tone and volitional movement development correlated with biological maturity, while primitive reflexes and automatic reactions were influenced by both maturity and environment.
Conclusions:
- Volitional movement and tone in preterm infants seem to develop based on biological maturity alone.
- Primitive reflexes and automatic reactions in preterm infants are influenced by both biological maturation and environmental factors.
- These findings highlight the differential impact of biological and environmental factors on specific aspects of preterm infant motor development.
Abstract:
A cohort of 62 low-risk preterm infants was identified and followed prospectively through the first 4 months of life to assess whether motor development is determined by biological maturity or the duration of the extrauterine experience. After identification, the cohort was subdivided into two groups according to gestational age at birth: less than 32 weeks gestation (n = 23) and greater than or equal to 32 weeks gestation (n = 39). Neuromotor assessments were performed on every infant at both 4 months chronological and 4 months adjusted ages. Analyses revealed that (1) the two groups of infants differed significantly at 4 months chronological age in terms of tone, primitive reflexes and volitional movement, but not in automatic reactions, and (2) the two groups of infants differed significantly at 4 months adjusted age in terms of primitive reflexes, but not in tone, automatic reactions or volitional movement. These findings suggest that the development of volitional movement and tone appear to evolve according to biological maturity alone. In contrast, primitive reflexes and automatic reactions in the preterm infant may be influenced by both biological maturation and environmental experience.