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Protein Supplement Blended From Soy And Dairy More Effectively Builds Lean Muscle

April 25, 2014: 12:00 AM EST
A new U.S. study finds that the source of supplemental protein is as important as the quantity and other factors in building lean muscle mass. The randomized clinical trial with 16 healthy adults aged 19 to 30 tested the impact of a soy-dairy protein drink compared to a single (whey isolate) protein drink. Muscle biopsies were taken at the start and after five hours of resistance exercise. The soy-dairy blend (soy, caseinate and whey) increased amino acid delivery for an hour longer than whey alone. The blend also sustained a greater positive amino acid balance, suggesting that there was less muscle protein breakdown right after the drink was consumed.
P. T. Reidy et al., "Soy-Dairy Protein Blend and Whey Protein Ingestion After Resistance Exercise Increases Amino Acid Transport and Transporter Expression in Human Skeletal Muscle. ", Journal of Applied Physiology, April 25, 2014, © The American Physiological Society
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