[Infusion solution with a high concentration of branched-chain amino acids and a high-percentage amino acid solution...

Young male rats are randomized into two groups and maintained by total parenteral nutrition with an isocaloric and isonitrogenous regimen for 6 days. Group I receives a 15% amino acid solution containing 17% branched chain amino acids while group II is given a 10% amino acid solution containing 26.6% branched chain amino acids. By this regimen group I receives 1.02 g and group II 1.77 g branched chain amino acids/kg B.W./day. No significant differences are observed in weight gain, nitrogen balance, amino acid excretion and amino acid concentrations in muscle. The higher supply with branched chain amino acids is simply reflected in significant augmented plasma concentrations of these amino acids. Simultaneously there is a significant increase of glycine and threonine in plasma. The infusion of the concentrated amino acid solution is well tolerated by the animals and results in a decreased urinary volume.