Abstract
Changes in fasting plasma amino acid levels that occur during growth (in children) and aging (in adults) are described. In general, plasma amino acid levels increase with age in children and to a greater extent in boys than in girls. It is suggested that these increases occur because of the increasing muscle mass of the growing children. Plasma levels of two amino acids, cystine and alanine, increase throughout life for both sexes. An analog of the coefficient of variation was calculated for each amino acid by using the variation about the regression line (s x.y) and the mean value at a median age. Plasma glutamine levels vary less than those of any other amino acid, while taurine, aspartic acid, and hydroxyproline levels are the most variable.
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