| Summary: | The purpose of this study was to examine 24 h urinary hydration markers in non-Hispanic White (WH) and non-Hispanic Black (BL) males and females. Thirteen males (BL, <i>n</i> = 6; WH, <i>n</i> = 7) and nineteen females (BL, <i>n</i> = 16, WH, <i>n</i> = 3) (mean ± SD; age, 20 ± 4 y; height, 169.2 ± 12.2 cm; body mass, 71.3 ± 12.2 kg; body fat, 20.8 ± 9.7%) provided a 24 h urine sample across 7 (<i>n</i> = 13) or 3 (<i>n</i> = 19) consecutive days (148 d total) for assessment of urine volume (U<sub>VOL</sub>), urine osmolality (U<sub>OSM</sub>), urine specific gravity (U<sub>SG</sub>), and urine color (U<sub>COL</sub>). U<sub>VOL</sub> was significantly lower in BL (0.85 ± 0.43 L) compared to WH college students (2.03 ± 0.70 L) (<i>p</i> < 0.001). Measures of U<sub>OSM</sub>, U<sub>SG</sub>, and U<sub>COL</sub>, were significantly greater in BL (716 ± 263 mOsm∙kg<sup>−1</sup>, 1.020 ± 0.007, and 4.2 ± 1.4, respectively) compared to WH college students (473 ± 194 mOsm∙kg<sup>−1</sup>, 1.013 ± 0.006, 3.0 ± 1.2, and respectively) (<i>p</i> < 0.05). Differences in 24 h urinary hydration measures were not significantly different between males and females (<i>p</i> > 0.05) or between the interaction of sex and race/ethnicity (<i>p</i> > 0.05). Non-Hispanic Black men and women were inadequately hydrated compared to their non-Hispanic White counterparts. Our findings suggest that development of targeted strategies to improve habitual fluid intake and potentially overall health are needed.
|
|---|