Figure 1. Representation of the two primary supplemented proteins (whey and casein) on protein synthesis rates and protein synthesis duration following resistance training. Whey exhibits a faster digestion rate in comparison with casein. This difference results in whey being responsible for a sharper increase in muscle protein synthesis and minimal effect on protein degradation after administration. Similarly, the slower digestion rate of casein still results in an increase in muscle protein synthesis, albeit it is blunted substantially in direct comparison to administration of whey, but more of a much greater amount of time, while exhibiting a powerful influence over preventing muscle protein breakdown.