Fig. 3.

Plasma l-[ring-²H₅]phenylalanine enrichment (means ± SEM) (A) and myofibrillar fractional synthetic rate (FSR) (B) using oral l -[ring-²H₅]phenylalanine tracer 1.5–4 h after resistance exercise in response to leucine-enriched essential amino acid (LEAA) or placebo (PLA) consumption. Data were analyzed using a 2-way repeated measures ANOVA (group × time) (A) and independent samples t-tests (B). MPE, mole percent excess. Means with different letters are significantly different from each other (main effect of time, P < 0.001). N = 8 for LEAA; N = 10 for PLA.