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Change from basal in the ratio of blood-to-muscle fluid amino acid enrichment as a result of the intravenous infusion of amino acids (i.e., delta ratio between basal and amino acid infusion). The ratios for both d9-leucine and 13C6-phenylalanine tracers were calculated by dividing the amino acid enrichment (i.e., molar percent excess [MPE]) in blood by the corresponding amino acid enrichment in muscle fluid. *P < 0.05.
