[Free amino acids in the blood of the "Salyut-5" crew members before and after a 21-day space flight (2d expedition)].

This paper presents the measurements of free amino acids in the plasma of the Salyut-5 crewmembers (the second expedition) before and after their 21-day space flight. The measurements were performed in a Hitachi KLA-3B automatic amino acid analyzer. The changes in amino acid metabolism were associated with the chemical composition of the space diet, actual food intake and space flight effects. The conclusion is made that the dietary content of cystine and methionine, as well as phenylalanine, tyrosine, glycine, glutamic acid and serine should be increased. No signs of hepatic or renal dysfunction were detected. It is recommended to control strictly food consumption inflight.