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Abstract
The evolution of a series of aminoacids in urinary excretion, important as biochemical-nutritional parameters, has been studied in 41 preterm and lowbirth-weight infants during the first month of life. Index commonly used as indicators of malnutrition have also been studied. All the infants who have been studied, had a satisfactory evolution, presenting normal growth and adequate biological parameters. The excretion of 3-metyl-His and Gly, increases progressively with time, which indicates that the low-birth-weight infants are receiving an adequate intake for recovery. The preterm infants present a significant increase in Alanine excretion which is probably due to a lack in its metabolism. The excretion of branched chain aminoacids is increased in low-birth-weight infants according to the moment of birth. This points out towards a normalization of muscle metabolism in thcse infants. BCA index, is decreased at 15 days after birth in low-birth-weight infants respecting to the preterm infants, what shows the malnourished state of the former, but is favorably recovered after the first month in both cases. The same recovery is observed in the Gly/Val index.
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