Friday, October 7, 2011

Soy v. Whey Protein

There is a lot of dissension on the good and evils of soy protein in endurance athletes.  One of the arguments that is made by the detractors of soy protein is that it inhibits protein synthesis.  While it may have less muscle protein synthesis after resistance exercise (which itself is a big contributor to muscle protein synthesis), it is still better than casein, another milk derived protein.
The researches from one study concluded that the rapid rise in amino acids after whey, compared with soy ingestion may be one of the contributing factors.
Source: Ingestion of whey hydrolysate, casein, or soy protein isolate: effects on mixed muscle protein synthesis at rest and following resistance exercise in young men. Tang et al. J. Appl Physiol. 2009 Sep;107(3):987-92.

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