Table 2.
Effects of altered dietary sodium intake
| Run-In | Low Sodium | High Sodium | |
|---|---|---|---|
| Biological variables | |||
| Serum potassium, mmol/l | 4.00 ± 0.14 | 3.94 ± 0.12 | 4.17 ± 0.15 |
| Serum chloride, mmol/l | 105.3 ± 0.6 | 102.3 ± 0.6 | 106.6 ± 0.8* |
| Hemoglobin, g/dl | 13.3 ± 0.3 | 13.8 ± 0.3 | 12.8 ± 0.5* |
| Hematocrit, % | 40.9 ± 0.7 | 42.3 ± 0.7 | 39.8 ± 1.4* |
| SBP, mmHg | 113 ± 1 | 113 ± 2 | 113 ± 2 |
| DBP, mmHg | 70 ± 1 | 70 ± 2 | 67 ± 1 |
| MAP, mmHg | 84 ± 1 | 84 ± 2 | 83 ± 2 |
| HR, beats/min | 59.7 ± 2.3 | 62.2 ± 1.7 | 58.0 ± 2.6* |
| Respiration rate, min−1 | 15.6 ± 0.9 | 15.5 ± 1.0 | 15.9 ± 0.8 |
| cBRS | |||
| Up sequences, ms/mmHg | 20.0 ± 4.0 | 17.6 ± 2.4 | 24.6 ± 3.7 |
| Down sequences, ms/mmHg | 21.0 ± 2.3 | 18.3 ± 2.1 | 25.5 ± 3.8* |
| HRV | |||
| SDNN, ms | 74.6 ± 8.3 | 69.1 ± 5.4 | 75.3 ± 7.7 |
| RMSSD, ms | 68.7 ± 8.6 | 61.9 ± 5.7 | 79.0 ± 10.1* |
| HF power, ms2 | 1,301 ± 318 | 1,244 ± 370 | 1,645 ± 467 |
Values are means ± SE. cBRS, cardiovagal baroreflex sensitivity; DBP, diastolic blood pressure; HF, high frequency; HR, heart rate; HRV, HR variability; MAP, mean arterial pressure; RMSSD, root mean square of successive differences in R-R interval; SBP, systolic blood pressure; SDNN, SD of normal-to-normal R-R intervals.
*
Significantly different from low sodium (P < 0.05).