Anabolic Window
The anabolic window is the post-exercise period during which muscle protein synthesis is most responsive to dietary protein. The classic claim was a strict 30 to 60 minutes; modern evidence suggests it is more like 3 to 6 hours, and that total daily protein intake matters more than the precise timing of a post-workout shake.
Why It Matters
The anabolic window is one of the most overhyped concepts in sports nutrition. The 30-minute version is a relic of older studies that compared post-workout protein to no protein at all. Newer research shows that as long as you eat protein within several hours of training, the muscle-building effect is essentially identical.
How to Spot It on a Label
Reasonable practice: aim to consume 20 to 40g of complete protein within 2 hours of training. If you ate a protein-rich meal in the 2 hours before training, the post-workout shake is even less urgent. Total daily protein (1.6 to 2.2g per kg of body weight) is the bigger lever.
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