Plasma Amino Acid Responses After Consumption of Beverages with Varying Protein Type

摘要

Two experiments were performed to examine how different proteins in a carbohydrate-,protein beverage affect postprandial amino acid (AA), glucose, and insulin responses. In one, volunteers drank 3 beverages in separate trials, each differing in protein type. Ten additional volunteers consumed the same drinks after 60 min of varying-intensity exercise. Blood glucose, insulin, glucose-dependent insulinotrophic polypeptide, and AAs were measured after consumption. Branched-chain AA concentrations peaked at 30 min and did not differ between beverages at rest or postexercise. There were no significant differences between beverages with respect to initial or total area under the curve for any outcome measures at rest or postexercise. High-carbohydrate beverages with various proportions of milk proteins from a supplier to the commercial industry had no impact on AA concentration. Retrospective chemical analysis of commercial proteins showed that casein was partially hydrolyzed; therefore, consumers should carefully consider the manufacturer or other factors when procuring these beverages for their purposed physiological effects.