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Plasma and urine carnitine levels during development

P A Battistella, L Vergani, F Donzelli

    Pediatric Research
    |December 1, 1980
    PubMed
    Summary
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    Free carnitine levels in plasma and urine change during human development. Concentrations are lower in infants and children compared to adults, reaching adult levels by six months.

    Area of Science:

    • Biochemistry
    • Human Development
    • Nutritional Science

    Background:

    • Carnitine is essential for energy metabolism.
    • Understanding carnitine levels during development is crucial for assessing nutritional status and metabolic health.
    • Previous studies have not comprehensively evaluated free carnitine concentrations throughout human growth.

    Purpose of the Study:

    • To evaluate plasma and urine free carnitine concentrations in humans from infancy to adulthood.
    • To identify correlations between free carnitine levels and factors like body weight, gestational age, and chronological age.
    • To determine the developmental trajectory of free carnitine levels and compare excretion patterns.

    Main Methods:

    • Measurement of plasma and urine free carnitine concentrations.

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  • Analysis of data based on age groups: premature neonates, full-term newborns, infants, children, and adults.
  • Statistical analysis to determine correlations and significant differences between groups.

    • Main Results:

    • Plasma free carnitine positively correlated with body weight in premature neonates.
    • Full-term newborns had similar plasma levels to premature infants (33-36 weeks gestation) but lower than earlier premature infants (30-33 weeks gestation).
    • Plasma free carnitine levels correlated with age in newborns during the first two weeks and reached adult levels by six months.
    • Urinary free carnitine excretion was significantly lower in infants and young children compared to adults.
    • No sex-related differences were observed in any age group.

    Conclusions:

    • Free carnitine concentrations undergo significant changes during human development.
    • Age and gestational maturity are key determinants of plasma free carnitine levels in early life.
    • Urinary excretion patterns indicate developmental changes in carnitine metabolism and reabsorption.