Table 2.
Blood urea (mean ± SD) levels in mg/dL in volunteers in the first week (groups A0 (earthed) and B1 (unearthed)) and in the second week of the experiment (groups A1 (unearthed) and B0 (earthed)).
| I (rest) | II (15 min of exercise) | III (30 min of exercise) | IV (40 min of recovery) | |
|---|---|---|---|---|
| A0 | 30.95 ± 7.34∗I–III | 30.68 ± 6.84 | 30.53 ± 7.01 | 30.63 ± 7.06 |
| A1 | 31.84 ± 7.17 | 31.84 ± 7.20 | 31.63 ± 7.37 | 31.68 ± 7.20 |
| B0 | 30.55 ± 6.24 | 30.60 ± 6.17 | 30.45 ± 5.91 | 30.30 ± 5.79 |
| B1 | 32.70 ± 6.98 | 32.50 ± 7.03 | 32.60 ± 7.00 | 32.55 ± 6.81 |
*Significant differences between phases at P < 0.05.