FIGURE 4.

Plasma l-[1-¹³C]-leucine (A), l-[ring-²H₅]-phenylalanine (B), and l-[1-¹³C]-phenylalanine (C) enrichments (MPE) during postabsorptive conditions (t = 0 min) and during postprandial conditions (t = 20–360 min) after beverage intake during recovery from a single bout of endurance exercise in young men. Values represent means ± SEMs, n = 12 per group. Data for plasma l-[1-¹³C]-leucine, l-[ring-²H₅]-phenylalanine, and l-[1-¹³C]-phenylalanine enrichments were analyzed by a 2-factor repeated-measures ANOVA. Tukey post hoc testing was used to detect differences between groups. Labeled means within a time without a common letter differ, P < 0.05. MPE, mole percentage excess; 0 g PRO, 45 g carbohydrate co-ingested with 0 g protein; 15 g PRO, 45 g carbohydrate co-ingested with 15 g protein; 30 g PRO, 45 g carbohydrate co-ingested with 30 g protein; 45 g PRO, 45 g carbohydrate co-ingested with 45 g protein.