Lorsque l'on désire une réponse anabolique, la whey est plus appropriée que la caséine
Nutrient Physiology, Metabolism, and Nutrient-Nutrient Interactions
Whey Protein Ingestion Enhances Postprandial Anabolism during Short-Term Bed Rest in Young Men
J. Nutr. 138:2212-2216, November 2008
Raffaella Antonione4, Elena Caliandro4, Francesca Zorat4, Gianfranco Guarnieri4, Martina Heer5 and Gianni Biolo
We tested the relative ability of rapidly digested whey and slowly digested casein to stimulate net whole-body protein synthesis during prolonged physical inactivity. We studied 8 young male volunteers after they consumed isonitrogenous casein or whey mixed meals on d 12 or d 14 of experimental bed rest. Rates of phenylalanine hydroxylation were measured by primed-constant oral administration of L[2-2H2]tyrosine and L[ring-2H5]phenylalanine for 3 h in the postabsorptive state and 6 h after an isonitrogenous bolus meal containing sucrose (0.27 g/kg) and casein or whey (0.40 g/kg). Net protein synthesis in the fed state was calculated during the first 6 h postmeal as the difference between phenylalanine hydroxylation and phenylalanine content in the ingested casein or whey. In the fed state, the integrated changes in phenylalanine hydroxylation were lower (P < 0.05) after whey (–2 ± 8 µmol·kg–1·6 h–1) than after casein ingestion (34 ± 7 µmol·kg–1·6 h–1). During bed rest, net postprandial protein synthesis was greater (P < 0.05) after whey (96 ± 8 µmol phenylalanine·kg–1·6 h–1) than after casein ingestion (82 ± 7 µmol phenylalanine·kg–1·6 h–1). The rapidly digested whey protein was more efficient than the slowly digested casein in increasing postprandial net protein synthesis during short-term bed rest.
