TABLE 2.
Systolic and diastolic blood pressure, body weight, urinary volume, creatinine and sodium excretion, and serum and sweat-output sodium and potassium in black and white girls during week 3 of the study period
| Low-sodium diet |
High-sodium diet |
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| Measurement | Blacks (n = 30) | Whites (n = 20) | Blacks (n = 30) | Whites (n = 20) |
| Systolic blood pressure (mm Hg) | 102.0 ± 8.9 | 100.0 ± 8.7 | 100.4 ± 8.3 | 100.8 ± 7.7 |
| Diastolic blood pressure (mm Hg) | 54.7 ± 10.6 | 54.5 ± 10.0 | 56.4 ± 11.2 | 56.2 ± 9.9 |
| Body weight (kg) | 52.6 ± 25.3 | 53.0 ± 34.0 | 53.0 ± 25.0 | 53.4 ± 35.0 |
| Urinary volume (mL) | 1269.8 ± 419.9 | 1252.8 ± 326.6 | 1295.9 ± 365.6 | 1347.3 ± 312.3 |
| Urinary creatinine (mg/d) | 880.7 ± 218.2 | 842.7 ± 204.4 | 874.7 ± 272.6 | 854.1 ± 195.1 |
| Urinary sodium (mmol · Lminus1 · dminus1) | 66.7 ± 10.6 | 73.6 ± 12.8 | 130.3 ± 21.0 | 158.8 ± 15.41 |
| Sweat potassium (mmol · Lminus1 · dminus1)2 | 5.41 ± 1.96 | 5.42 ± 1.83 | 5.55 ± 2.393 | 5.69 ± 2.46 |
| Sweat sodium (mmol · Lminus1 · dminus1)2 | 3.96 ± 1.87 | 4.28 ± 2.30 | 5.43 ± 2.06 | 7.50 ± 7.31 |
| Serum sodium (mEq/L)4 | 140.9 ± 2.37 | 142.2 ± 1.50 | 140.8 ± 3.07 | 143.3 ± 2.86 |
| Serum potassium (mEq/L) | 4.46 ± 0.25 | 4.38 ± 0.31 | 4.44 ± 0.38 | 4.32 ± 0.37 |
1
Significantly different from blacks on the same diet, P < 0.05 (ANOVA).
2
Data from reference 21.
3
Significantly different from the low-sodium diet, P < 0.05 (ANOVA).
4
Data for 27 girls were eliminated due to an instrument error that resulted in physiologically high concentrations.