Protein and / or amino acid ingestion stimulates skeletal muscle protein synthesis, inhibits protein breakdown and, as such, stimulates muscle protein accretion following resistance and endurance type exercise. (lift-heavy.com)
Whey protein stimulates postprandial muscle protein accretion more effectively than do casein and casein hydrolysate in older men. (thinkusadairy.org)
Pennings, B, et al. 2011 Whey protein stimulates postprandial muscle protein accretion more effectively than do casein and casein hydrolysate in older men. (zoeharcombe.com)