Soy, Whey Protein Flex Similar Muscle

by Kyle Bradley
02/08/2007

EVANSVILLE — Soy and whey protein synthesize skeletal muscle at comparable rates after exercise. Researchers from the Indiana University School of Medicine, Evansville, assessed skeletal muscle synthesis in three groups of treadmill-acclimated rats given soy or whey protein after endurance exercise. Groups were given either carbohydrates only (C), carbohydrates and soy protein (CS), or carbohydrates and whey protein (CW)—one hour after a nearly 2.5-hour treadmill run. Insulin and branched-chain amino acid concentrations were higher in the CS and CW groups, with serum leucine and isoleucine the highest in the CW group. Compared with the C group, both CS and CW increased protein synthesis in skeletal muscle. Researchers concluded soy and whey protein in the skeletal muscle of exercised rats synthesize protein at comparable measures after strenuous exercise. The study appeared in The Journal of Nutrition (137:357-362, 2007).

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