Association between birth weight and neuromotor performance: a twin study.

Area of Science:

• Developmental Psychology
• Pediatrics
• Behavioral Genetics

Background:

• Low birth weight (BW) is associated with various health issues and impaired motor skills.
• Understanding the factors influencing neuromotor performance (NMP) is crucial for child development.

Purpose of the Study:

• To quantify the association between BW and NMP in twins.
• To assess if twins' NMP falls within typical ranges.
• To compare intra-pair similarities in NMP between monozygotic (MZ) and dizygotic (DZ) twins.

Main Methods:

• A sample of 191 twins (78 MZ, 113 DZ) was assessed using the Zurich Neuromotor test battery.
• Birth weight, gestational characteristics, and sports participation were recorded.
• DNA analysis confirmed zygosity; neuromotor assessments demonstrated high reliability.

Main Results:

• Birth weight explained up to 11% of the variance in NMP.
• A significant proportion of children (32.7%-76.9%) scored below the 10th percentile in tasks requiring performance timing and balance.
• MZ twins exhibited greater NMP similarity than DZ twins in three of five tasks, indicating genetic influence.

Conclusions:

• BW is a significant factor in NMP, with many children showing deficits in motor timing and balance.
• Genetic factors play a substantial role in neuromotor development, as evidenced by higher concordance in MZ twins.
• Further research into interventions for children with low BW and motor challenges is warranted.