Individual day-to-day variations in plasma amino acid levels in healthy persons |
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Authors: | J Demling K Langer M Wörthmüller V Yusufu |
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Institution: | (1) Department of Psychiatry, University of Erlangen-Nürnberg, Schwabachanlage 6, D-91054 Erlangen, Federal Republic of Germany;(2) Kabi Pharmacia GmbH, Schwabachanlage 6, D-91054 Erlangen, Federal Republic of Germany |
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Abstract: | Summary Fasting plasma levels of the large neutral amino acids (LNAA;l-forms) andl-tryptophan (TRP) ratios were determined in thirteen healthy volunteers (7 males, 6 females) on five consecutive mornings, and the same procedure was repeated for each individual three months later. We found characteristic overall ranges for the parameters studied, and, in addition to certain differences between the sexes, considerable inter- and intraindividual daily variations. Although the individuals showed statistically identifiable mean levels that, in the majority of subjects, were maintained over a period of three months, it is concluded that the degree of intraindividual variability does not allow us to regard a single value as characteristic for a given individual. This should be borne in mind in particular in follow-up studies of plasma LNAA in patients with, for example, depressive disorders. |
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Keywords: | Amino acids Plasma Tryptophan Large neutral amino acids Variability Variation coefficient Affective disorders |
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