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Serum prolactin levels and behavior in infants
B Lozoff1, B T Felt, E C Nelson
1Center for Human Growth and Development, University of Michigan, Ann Arbor 48109-0406.
Biological Psychiatry
|January 1, 1995
Summary
Serum prolactin levels in infants and toddlers remained consistent over three months. Higher prolactin levels were associated with more hesitant and unhappy behaviors during stressful testing, suggesting a link to neuroendocrine stress responses.
Area of Science:
- Pediatric Neuroendocrinology
- Developmental Psychology
Background:
- Serum prolactin is a hormone implicated in various physiological processes.
- Understanding early-life stress responses is crucial for developmental health.
Purpose of the Study:
- To investigate the relationship between serum prolactin levels and behavioral responses in infants and toddlers.
- To assess the stability of serum prolactin levels over a three-month period.
Main Methods:
- Serum prolactin levels were measured in infants and toddlers.
- Behavioral observations were recorded during developmental testing and venipuncture.
- Statistical analyses, including correlation and chi-square tests, were employed.
Main Results:
- Serum prolactin levels demonstrated significant consistency over a 3-month period (r = 0.64, p < 0.001).
- Children with high serum prolactin levels (> or = 25 ng/ml) were more likely to exhibit abnormal affect (53%) compared to those with lower levels (20%, p < 0.001).
- High prolactin levels correlated with increased hesitancy and unhappiness during developmental testing.
Conclusions:
- Serum prolactin levels are stable in early childhood and may serve as a biomarker for individual stress responses.
- These findings suggest a link between neuroendocrine function (prolactin) and behavioral manifestations of stress in young children.