title: Diurnal variations in plasma aminoacid concentrations. I) Effect of dietary protein intake on rhythm of neutral aminoacids.
abstract: The effect of dietary protein content on the diurnal variations in plasma neutral amino acid levels was studied in normal human subjects. For 3 consecutive 5-day periods, subjects consumed diet containing 0-or 75 or 150 g of protein per day. Blood samples were drawn at 4-hr intervals on the 4th and 5th days of each period. Consumption of the protein-free diet caused plasma concentration of all amino acids in the late morning and afternoon, while the 150 g protein diet elicited increases in these levels during the daytime. Ingestion of the diet containing 75 g protein tended to diminish the amplitude the daily rhythms.
mesh_terms: D000328:Adult; D000596:Amino Acids / Q000097:blood*; D002940:Circadian Rhythm; D004044:Dietary Proteins / Q000494:pharmacology*; D006801:Humans; D008297:Male
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins