Table 3. Measures of protein metabolism before and after intake of the hydrolyzed casein (hCAS), hydrolyzed whey (hWHEY), hydrolyzed casein with added leucine (hCAS+LEU) and hydrolyzed whey with added leucine (hWHEY+LEU) protein mealsa.
| hCAS | hCAS+LEU | hWHEY | hWHEY+LEU | |||||
|---|---|---|---|---|---|---|---|---|
|
|
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| Postabs | Prandial | Postabs | Prandial | Postabs | Prandial | Postabs | Prandial | |
| WbPSb | 44.3 ± 3.3 | 60.0 ± 4.6 | 45.2 ± 3.3 | 60.7 ± 4.4 | 45.1 ± 2.7 | 56.5 ± 3.6 | 43.2 ± 2.9 | 55.2 ± 3.2 |
| WbPBb | 47.8 ± 3.3 | 43.5 ± 3.2 | 49.1 ± 3.3 | 44.5 ± 3.0 | 48.7 ± 2.5 | 39.4 ± 1.9 | 47.2 ± 3.0 | 39.3 ± 2.1 |
| Hydroxylationb | 4.6 ± 1.1 | 7.4 ± 2.2 | 5.4 ± 1.2 | 7.4 ± 1.9 | 4.9 ± 1.6 | 6.5 ± 2.2 | 4.2 ± 1.1 | 6.0 ± 1.5 |
| NetPS | −3.7 ± 0.3 | 16.6 ± 1.8 | −4.6 ± 0.4 | 16.2 ± 1.9 | −4.1 ± 0.4 | 16.2 ± 1.8 | −4.4 ± 0.4 | 15.9 ± 1.6 |
| MPB | 1.60 ± 0.20 | 1.14 ± 0.12 | 1.60 ± 0.15 | 1.08 ± 0.10 | 1.53 ± 0.10 | 1.01 ± 0.06 | 1.57 ± 0.13 | 1.09 ± 0.08 |
a
Values are means ± SEM and expressed in μmol · kg ffm−1 · h−1. Data show postabsorptive values (postabs) and values for the 4 h prandial state (averaged per hour) following intake of the hCAS, hCAS+LEU, hWHEY or hWHEY+LEU protein meals. FFM: fat-free mass, MPB: myofibrillar protein breakdown, NetPS: net protein synthesis, WbPB: whole-body protein breakdown [reflects the rate of appearance of endogenous phenylalanine], WbPS: whole-body protein synthesis.
b
A significant protein meal effect was observed in the prandial state, P<0.01.