Speaking of the anabolic window, you may have heard that it’s largely a myth due to one study in particular which showed that, in untrained subjects, MPS can be elevated for up to 24 hours after a workout. The theory, then, is that there’s no need to take your protein right after a workout – no rush, you have 24 hours! Right?
Well, not really. Remember, those were untrained subjects. In a follow-up to that same study, the researchers found that after 8 weeks, MPS could only be elevated within 8 hours after a workout. That’s after just 8 weeks! What happens after 8 months, 8 years… or 20+ years for guys like me who started training as kids? Your anabolic window may start out at 24 hours, but it shrinks rapidly.
Plus, when it comes to building muscle, there’s something going on in your body called net protein balance. That’s how much muscle protein we have at a given time. You’re either synthesizing (building up) or breaking down muscle protein, plain and simple. If I’m sitting around not training and consuming protein, I’m synthesizing, and I’ll have a positive net protein balance; I’ll essentially have a surplus of muscle protein. On the flip side, if I go train on an empty stomach, my muscle protein will be used during the workout, and I’ll then have a negative net protein balance, or a deficit.
What you need to realize is this: As long as I have a negative protein balance, MPS will NOT happen. It takes a positive balance to synthesize muscle protein. And this won’t happen until I consume protein.
So, think about it: Assuming you burn through your muscle protein during a workout (whether you were training on an empty stomach or not), the longer you wait to consume protein, the more you’re breaking down muscle protein and the longer you’re putting off MPS. Even if you believe that you have several hours to elevate MPS, why would you want to keep breaking down muscle protein and remain in a negative protein balance?! There’s no benefit!
Bottom line: When you’re done training, take your protein!