TYPE A said:
Huh? Define "circulating amino acid levels" from soy protein?
Protein from whole foods after training would be better than your soy. Save your soy until later, like before bed.
Protein from whole foods is better than soy, regardless of the time. However, his original question was with regards to using the soy for post-workout recovery purposes, until he gets his whey protein.
It's been repeated so often it's a cliche, but you've got a small window of opportunity post-workout when the muscles are more receptive to taking-up large quantities of macronutrients. If you eat whole-foods after your workout, that's fine and dandy, but by the time they're liquified by the stomach, and then make it from the intestines into the bloodstream, that window will have passed.
Now, to answer your question, when the liquified protein (from soy or any other source) makes it to the small intestine, the protein is first broken down into peptide chains, di&tri-peptides, and mostly amino acids. Once these get into the bloodstream, they do circulate for a while, rather than there being an immediate 'use it or lose it' situation. So, by taking the soy protein pre-workout, this gives him at least an hour or two for digestion to occur, and the blood-levels of amino acids (and various peptides, if you want to be particular) to elevate. Some of these AA's will already be being taken-up by the muscle cells, but then taking the dextrose post-workout will provide the insulin surge to drive the carbs & more AA's into the muscle.
If you ask me, there's no reason to take soy at all. (Casein or other milk-protein would be way better at bedtime.) But since he was asking for a workaround to his problem, I provided one.