Table 3 Results of the haematological and urinary parameters before and after the race ( n = 15). Results are presented as mean ± SD. * = p <0.05
Pre-race | Post-race | Absolute change | Percent change | |
|---|---|---|---|---|
Haemoglobin (g/dl) | 14.8 ± 0.7 | 15.0 ± 0.9 | + 0.2 ± 0.6 | + 1.2 ± 4.3 |
Haematocrit (%) | 43.9 ± 2.5 | 43.7 ± 2.9 | - 0.2 ± 2.6 | - 0.4 ± 5.8 |
Serum sodium (mmol/l) | 138.9 ± 1.4 | 140.0 ± 2.9 | + 1.1 ± 2.9 | + 0.8 ± 1.8 |
Serum potassium (mmol/l) | 4.4 ± 0.4 | 4.4 ± 0.4 | + 0.0 ± 0.5 | + 0.7 ± 12.0 |
Serum creatinine (μmol/l) | 76.3 ± 9.2 | 94.5 ± 19.1 | + 18.2 ± 19.6 * | + 25.2 ± 30.0 |
Serum urea (mmol/l) | 5.9 ± 1.1 | 9.0 ± 1.1 | + 3.1 ± 1.2 * | + 57.6 ± 27.6 |
Serum osmolality (mosmol/kgH2O) | 296.6 ± 2.9 | 304.6 ± 6.0 | + 8.0 ± 6.3 * | + 2.7 ± 2.1 |
Urine specific gravity (g/ml) | 1.013 ± 0.006 | 1.026 ± 0.005 | + 0.013 ± 0.007 * | + 1.33 ± 0.76 |
Urine osmolality (mosmol/kgH2O) | 531.7 ± 271.2 | 836.5 ± 196.3 | + 304.8 ± 201.3 * | + 94.5 ± 88.9 |
Fractional sodium excretion (%) | 1.32 ± 0.76 | 0.39 ± 0.27 | - 0.93 ± 0.65 * | - 66.6 ± 23.1 |
Fractional urea excretion (%) | 54.2 ± 10.9 | 29.2 ± 11.7 | - 25.0 ± 14.2 * | - 44.6 ± 23.1 |
Creatinine clearance (ml/min) | 116.5 ± 23.4 | 91.6 ± 15.5 | - 24.9 ± 25.7 * | - 19.3 ± 16.0 |
Potassium-to-sodium ratio in urine (ratio) | 0.54 ± 0.40 | 4.41 ± 4.96 | + 3.87 ± 4.88 * | + 996 ± 1,504 |
Transtubular potassium gradient (ratio) | 22.4 ± 17.8 | 100.1 ± 60.3 | + 77.7 ± 59.2 * | + 936 ± 1,230 |