I disagree with waiting 40 minutes. I read somewhere (Cant remember the source) where the body starts to hit a catabolic state without eating so long after a good workout. I like to go from my colleges gym to the caf within 10 minutes and drink my shake with a small meal.
If he's drinking purple wraath intra-workout there's no way he'll be catabolic at the end of a workout. Waiting 30-40min won't impede his progress whatsoever in that situation. In fact, I've "read somewhere" that consuming a post-workout shake immediately upon finishing a workout can actually trigger less protein synthesis than if the subject waited for a little while.
Comparing research that used drinks consumed immediately after a workout (Tipton et al., 2001) versus those ingested an hour after training (Rasmussen et al., 2000), the results are surprising: it seems that post workout meal ingestion actually results in 30% lower protein synthesis rates than when we wait! So every time we thought that we were badass for drinking "as soon as the weight hit the floor, we were actually short changing ourselves.
Rasmussen, BB, Tipton KD, Miller SL, Wolf SE, and Wolfe RR. An oral essential amino acid-carbohydrate supplement enhances muscle protein anabolism after resistance exercise. J Appl Physiol 88: 386-392, 2000
Tipton KD, Rasmussen BB, Miller SL, Wolf SE, Owens-Stovall SK, Petrini BE, Wolfe RR. Timing of amino acid-carbohydrate ingestion alters anabolic response of muscle to resistance exercise. Am J Physiol Endocrinol Metab. 2001 Aug;281(2):E197-206
The second paper is actually comparing a pre to a post-workout shake, but the post-workout shake was consumed immediately post-workout. In comparison to the post-workout shake administered a full hour later in the first paper, net protein synth is higher for the delayed shake.
