Table 3.
Water input and output of younger and older men and women during water balance study1
| Group | |||||
|---|---|---|---|---|---|
| Variable | Trial | YM
(n = 11) |
OM
(n = 10) |
YW
(n = 14) |
OW
(n = 11) |
| Water input (mL/d) | |||||
| Ad libitum2 | IPro | 1694 ± 759 | 1936 ± 578 | 1134 ± 667 | 1635 ± 413 |
| MPro | 1714 ± 533 | 1704 ± 440 | 1382 ± 661 | 1670 ± 385 | |
| APro | 1758 ± 537 | 1849 ± 689 | 1452 ± 661 | 1612 ± 236 | |
| Food and beverages2,3 | IPro | 2231 ± 386 | 1910 ± 415 | 1773 ± 177 | 1716 ± 255 |
| MPro | 2095 ± 301 | 1850 ± 302 | 1749 ± 233 | 1670 ± 172 | |
| APro | 1997 ± 419 | 1785 ± 328 | 1686 ± 224 | 1611 ± 180 | |
| Metabolic2,3 | IPro | 406 ± 77 | 356 ± 59 | 317 ± 20 | 278 ± 28 |
| MPro | 396 ± 60 | 353 ± 50 | 318 ± 22 | 276 ± 27 | |
| APro | 394 ± 67 | 362 ± 59 | 313 ± 19 | 275 ± 26 | |
| Total2 | IPro | 4331 ± 961 | 4202 ± 864 | 3224 ± 749 | 3628 ± 458 |
| MPro | 4204 ± 758 | 3906 ± 488 | 3448 ± 695 | 3617 ± 437 | |
| APro | 4150 ± 804 | 3996 ± 943 | 3451 ± 744 | 3498 ± 337 | |
| Water output | |||||
| Urine | IPro | 2278 ± 878 | 2432 ± 770 | 1929 ± 672 | 2347 ± 546 |
| MPro | 2162 ± 539 | 2246 ± 391 | 2060 ± 732 | 2385 ± 552 | |
| APro | 2095 ± 514 | 2302 ± 803 | 2057 ± 681 | 2186 ± 333 | |
| Stool2,3 | IPro | 117 ± 56 | 138 ± 76 | 76 ± 41 | 152 ± 82 |
| MPro | 137 ± 51 | 147 ± 101 | 84 ± 60 | 102 ± 55 | |
| APro | 138 ± 37 | 146 ± 49 | 81 ± 34 | 128 ± 85 | |
| Insensible2,3 | IPro | 1351 ± 255 | 1185 ± 194 | 1073 ± 83 | 957 ± 90 |
| MPro | 1323 ± 200 | 1183 ± 167 | 1058 ± 72 | 958 ± 92 | |
| APro | 1325 ± 223 | 1220 ± 196 | 1044 ± 60 | 959 ± 92 | |
| Total2 | IPro | 3746 ± 1013 | 3755 ± 835 | 3077 ± 732 | 3455 ± 498 |
| MPro | 3622 ± 682 | 3576 ± 462 | 3202 ± 782 | 3445 ± 547 | |
| APro | 3558 ± 613 | 3667 ± 912 | 3183 ± 678 | 3273 ± 352 | |
| Net water balance2 | IPro | 586 ± 634 | 446 ± 688 | 146 ± 365 | 173 ± 174 |
| MPro | 583 ± 410 | 330 ± 291 | 247 ± 437 | 172 ± 359 | |
| APro | 592 ± 675 | 329 ± 481 | 268 ± 579 | 226 ± 372 | |
1
All values are x̄ ± SD. YM, younger men; OM, older men; YW, younger women; OW, older women; IPro, inadequate protein intake (0.50 g protein · kg−1 · d−1); MPro, marginal protein intake (0.75 g protein · kg−1 · d−1); APro, adequate protein intake (1.00 g protein · kg−1 · d−1).
2
Men significantly different from women, P < 0.05 (between-subjects main effect of sex; three-way repeated-measures ANOVA).
3
Younger significantly different from older, P < 0.05 (between-subjects main effect of age, three-way repeated-measures ANOVA).