Phase And Vertical Shift. Phase and vertical shift refer to the transfer of a function in the horizontal and vertical directions, respectively. For the function , where A, B, C, and D are constants, the phase shift is defined as C/B. If the phase shift is positive, the shift occurs to the left; if the phase shift is negative, the shift occurs to the right.
So it is possible that a whole food meal will have a different impact on the duration of protein synthesis than pure amino acids. Our lab has recently shown that the duration of protein synthesis in response to a complete meal containing protein, carbohydrates, and fats is approximately 3 hours long. Therefore, it appears that a complete meal slightly prolongs the duration of protein synthesis.
For those who are looking to build muscle mass, the difference between the two proteins is the amount of time it takes for the body to metabolize the protein. Casein is a slow-acting protein, and whey is a fast-acting protein. It takes the body 3 to 4 hours to metabolize casein protein; whereas, whey protein can be metabolized in 20 minutes. Both proteins are desirable for building muscle mass.