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Nitrogen balance studies with normal children

E E Ziegler, A M O'Donnell, G Stearns

    The American Journal of Clinical Nutrition
    |June 1, 1977
    PubMed
    Summary
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    This study analyzed 1148 nitrogen balance studies in children aged 1-11 years. Nitrogen retention varied significantly by age, with the highest correlation observed in toddlers aged 12-18 months.

    Area of Science:

    • Pediatric Nutrition
    • Human Metabolism
    • Nutritional Biochemistry

    Background:

    • Nitrogen balance studies are crucial for assessing protein requirements and nutritional status in children.
    • Understanding how dietary protein intake affects nitrogen retention is vital for growth and development.
    • Previous research has indicated age-related differences in nutrient utilization, but specific data on nitrogen balance in young children is limited.

    Purpose of the Study:

    • To quantify nitrogen balance in a cohort of children aged 1 to 11 years.
    • To investigate the relationship between nitrogen intake and nitrogen retention across different pediatric age groups.
    • To determine the influence of age on the slope of nitrogen retention regression and its correlation with energy intake.

    Main Methods:

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    • Conducted 1148 nitrogen balance studies in 100 boys and 23 girls aged 1-11 years.
    • Utilized mixed, customary diets providing 8.9-21.4% of calories from protein.
    • Employed balance study durations of 72-120 hours, varying with age.

    Main Results:

    • Presented regressions and 95% confidence intervals for nitrogen retention based on nitrogen intake.
    • Identified a significantly greater regression slope for nitrogen retention in children aged 12-18 months compared to other age groups.
    • Reported correlation coefficients between nitrogen balance parameters and energy intake, noting significant inter-subject variability.

    Conclusions:

    • Age is a significant factor influencing nitrogen retention in young children, particularly between 12 and 18 months.
    • While within-subject variability in nitrogen balance is considerable, significant differences exist between individual children.
    • Findings contribute to a better understanding of pediatric protein metabolism and requirements.