TABLE 2.
Controlled energy and macronutrient intakes and nitrogen assessments of younger and older males and females with 125, 94, and 63% of the RDA for dietary protein1
| Trial3 | Group2
|
||||
|---|---|---|---|---|---|
| YM | OM | YF | OF | ||
| n | 10 | 9 | 8 | 9 | |
| Energy intake, MJ/d | P125 | 13.6 ± 2.7aj | 11.7 ± 1.9bj | 10.3 ± 0.7ak | 9.2 ± 0.9bk |
| P94 | 13.5 ± 2.5aj | 11.3 ± 1.6bj | 10.3 ± 0.7ak | 9.2 ± 0.9bk | |
| P63 | 14.0 ± 2.7aj | 11.1 ± 1.8bj | 10.3 ± 0.7ak | 9.2 ± 0.9bk | |
| Energy intake, kJ · kg−1 · d−1 | P125 | 165.3 ± 22.7a | 151.0 ± 28.9b | 160.1 ± 13.4a | 130.8 ± 14.8b |
| P94 | 166.1 ± 24.3a | 145.9 ± 14.7b | 161.0 ± 14.6a | 130.3 ± 14.5b | |
| P63 | 171.4 ± 24.1a | 145.0 ± 22.2b | 161.9 ± 15.1a | 130.4 ± 14.2b | |
| Protein intake, g · kg−1 · d−1 | P125x | 1.01 ± 0.01 | 1.01 ± 0.02 | 0.97 ± 0.02 | 1.01 ± 0.04 |
| P94y | 0.76 ± 0.02 | 0.76 ± 0.02 | 0.73 ± 0.01 | 0.76 ± 0.03 | |
| P63z | 0.51 ± 0.01 | 0.51 ± 0.01 | 0.51 ± 0.5 | 0.51 ± 0.02 | |
| Fat intake, g · kg−1 · d−1 | P125x | 1.37 ± 0.21a | 1.24 ± 0.24b | 1.35 ± 0.12a | 1.05 ± 0.13b |
| P94x | 1.42 ± 0.22a | 1.24 ± 0.14b | 1.39 ± 0.13a | 1.09 ± 0.14b | |
| P63y | 1.15 ± 0.24a | 1.28 ± 0.20b | 1.44 ± 0.14a | 1.09 ± 0.13b | |
| Carbohydrate intake, g · kg−1 · d−1 | P125x | 5.81 ± 0.89aj | 5.25 ± 1.20bj | 5.61 ± 0.54ak | 4.25 ± 0.52bk |
| P94x | 6.00 ± 0.97aj | 5.18 ± 0.57bj | 5.81 ± 0.58ak | 4.40 ± 0.50bk | |
| P63y | 6.32 ± 0.90aj | 5.39 ± 0.88bj | 6.02 ± 0.61ak | 4.65 ± 0.51bk | |
| Fiber intake, g/d | P125x | 34 ± 5aj | 34 ± 4bj | 24 ± 2ak | 18 ± 2bk |
| P94y | 35 ± 5aj | 28 ± 2bj | 22 ± 1ak | 18 ± 2bk | |
| P63z | 28 ± 5aj | 25 ± 4bj | 20 ± 2ak | 19 ± 2bk | |
| Urinary total nitrogen, g/d | P125x | 8.4 ± 2.4 | 8.9 ± 2.3 | 7.4 ± 1.8 | 8.4 ± 1.8 |
| P94y | 6.7 ± 2.0 | 7.3 ± 1.8 | 6.0 ± 0.7 | 6.6 ± 1.7 | |
| P63z | 5.0 ± 0.8 | 5.7 ± 0.8 | 4.9 ± 0.6 | 5.0 ± 0.9 | |
| BUN, mmol/L | P125x | 4.1 ± 1.0aj | 5.9 ± 1.1bj | 3.1 ± 0.8ak | 5.4 ± 1.4bk |
| P94y | 3.5 ± 0.9aj | 4.8 ± 1.3bj | 2.4 ± 0.5ak | 4.2 ± 0.7bk | |
| P63z | 2.9 ± 1.2aj | 4.0 ± 1.5bj | 2.0 ± 0.5ak | 3.1 ± 0.8bk | |
1
Values are means ± SD. Means for a variable with superscripts without a common letter differ by age (a and b) and by sex (j and k), P < 0.05. Post-hoc analysis using Tukey was done to determine difference between protein trials. Trials within a variable with superscripts without a common letter (x, y, and z) differ, P < 0.05.
2
Group: YM, younger males; OM, older males; YF, younger females; and OF, older females.
3
Protein trial: P125 = 125%; P94 = 94%; and P63 = 63% of the RDA for dietary protein.