Soy Nutrition Institute
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Apr 15, 2013

Blend of Whey, Casein and Soy Superior to Whey

In this double-blind, randomized, clinical trial, 19 young adults were studied before and after ingestion of approximately 19 g of protein blend (PB) or approximately 18 g whey protein (WP) consumed 1 h after high-intensity leg resistance exercise.  The blend consisted of 25% soy, 25% whey and 50% casein.  Whey protein ingestion resulted in higher and earlier amplitude of blood branched chain amino acid concentrations. The blend led to a lower initial rise in blood branched chain amino acids but sustained elevated levels later into recovery (P < 0.05).  Post-exercise protein fractional synthetic rate increased equivalently in both groups during the early period; however, it remained elevated only in response to the blend.  Therefore, the results suggest the blend is superior to whey along for building muscle in response to resistance exercise.

Reidy et al. J Nutr.