Abstract
We analysed over a period of 30-32 days the daily total hydroxyproline and creatinine excretine in urine from 9 healthy, normally fed 4 to 6 year-old children (2 girls, 7 boys). The average urinary hydroxyproline excretion was 45.6 mg/24 hr, with a coefficient of variation of 25.6%. Urinary hydroxyproline for individual children showed distinct differences from day to day, which were independent of urine volume. There were significant differences between the mean values for urine hydroxyproline in individual children, which were independent of age. The average creatinine in urine was 346/24 hr with a coefficient of variation of 17.7%. The hydroxyproline-index did not define the nutritional state of these normally developed children on a normal diet. Dietary hydroxyproline contributed 7.4% to the total urinary hydroxyproline in our investigation. There was a close correlation between urine hydroxyproline excretion and growth velocity in each child.
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