Whey Protein Rivals Soy for Muscle Building

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By VRP Staff

A new animal study indicates that whey protein synthesizes skeletal muscle after exercise and that its ability to do so is comparable to that of soy.
Researchers compared the early response of skeletal muscle protein synthesis following the ingestion of different protein sources in an animal model of endurance exercise. The researchers divided rats into four groups. The first group served as a non-exercised control group. The remaining three groups were treadmill exercised for 2 hours, then fed a meal containing carbohydrates only, carbohydrate plus soy, or carbohydrate plus whey protein.
Serum concentrations of branched-chain amino acids in the soy-supplemented and in the whey-protein-supplemented animals were higher than in the group fed only carbohydrates. Serum leucine and isoleucine concentrations were higher in the whey group than in the soy group. Both soy and whey protein caused a significantly higher rate of skeletal muscle protein synthesis compared to carbohydrate feeding only. Whey protein and soy protein also increased markers of protein synthesis.
Reference:
Anthony TG, McDaniel BJ, Knoll P, Bunpo P, Paul GL, McNurlan MA. Feeding Meals Containing Soy or Whey Protein after Exercise Stimulates Protein Synthesis and Translation Initiation in the Skeletal Muscle of Male Rats. J Nutr. February 2007;137:357-362.

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