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- W2020063598 abstract "Introduction: Plasma amino acid (AA) responses reportedly differ after consuming whey protein (WP) compared to casein (CAS), due to difference in digestion. Milk, which contains 80% CAS and 20% WP, produces a seemingly optimal AA response comprised of a rapid, postprandial AA rise attributable to WP and elevated, sustained AA concentrations due to CAS. PURPOSE: To compare effects of varying the CAS-WP ratio in a high-carbohydrate beverage on post-prandial AA responses at rest and after exercise. METHODS: Two randomized, repeated-measures experiments were performed. In one (REST), 10 volunteers drank a carbohydrate-protein beverage (380 kcals, 76 g carbohydrates, 19 g protein, 2 g fat) in 3 separate (>7 days) trials, each differing in protein type. All drinks were composed of cocoa powder (4 g) and non-fat dry milk (1 g) and supplemented with casein-only (CAS), whey-only (WP) or a blend of 85% CAS and 15% WP (CAS-WP). Subsequently, 10 volunteers consumed the same drinks after 60 min of exercise of varying intensity (60 and 85% VO2peak). Blood glucose, insulin, glucose inhibitory polypeptide (GIP) and AAs were measured for 4 hrs following beverage consumption. The effect of protein type was examined by comparing time to peak branched-chain amino acid (BCAA) concentration, peak BCAA concentration, and the integration of BCAA concentration and time, i.e. area under curve (AUC). RESULTS: At rest and post-exercise, BCAA values reached peak concentrations at 30 mins and were the same for WP, CAS and CAS-WP (rest: 677 ± 136, 693 ± 105 and 685 ± 105 μmol/L, respectively and post-exercise: 665 ± 30, 735 ± 78 and 675 ± 89 μmol/L, respectively). This corresponded to a 40%, 44% and 53% increase from BL at rest, respectively and 60%, 53% and 47% increase from BL post-exercise, respectively. There were no significant differences between beverages with respect to initial (time 0-60) or total AUC (time 0-240) for any outcome measures at rest or post-exercise. CONCLUSION: Varying protein type had no impact on AA concentration when incorporated into a high-carbohydrate beverage and consumed at rest or post-exercise. Therefore, other factors (i.e. cost, taste, shelf-stability) would be more important considerations for determining the milk-protein composition of high carbohydrate beverages. Research funded by MRMC." @default.
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- W2020063598 date "2008-05-01" @default.
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- W2020063598 title "Milk Protein Type Does Not Impact Plasma Amino Acid Concentration When Incorporated Into a High Carbohydrate Beverage" @default.
- W2020063598 doi "https://doi.org/10.1249/01.mss.0000321890.92647.20" @default.
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