Table 4 Physical, blood and urine parameters before and after the race (n = 3)
| Â | Pre-race | Post-race | Change (absolute) | Change (%) |
|---|---|---|---|---|
Body mass (kg) | 72.8 (12.5) | 71.0 (12.4) | –1.8 (0.4)* | –2.5 (0.5)* |
Haematocrit (%) | 42.7 (1.1) | 40.9 (3.2) | –1.8 (3.1) | –4.4 (7.2) |
Plasma sodium (mmol/l) | 139 (1.9) | 132 (1.9) | –7 (2.6)* | –5 (1.9)* |
Plasma potassium (mmol/l) | 5.5 (0.7) | 5.5 (0.5) | –0.1 (1.7) | –2.3 (30.9) |
Plasma osmolality (mosmol/kg H2O) | 287.7 (3.6) | 287.7 (5.5) | 0.0 (4.4) | 0.0 (1.5) |
Urine specific gravity (g/ml) | 1.011 (0.003) | 1.026 (0.001) | 0.020 (0.010)* | 1.520 (0.550)* |
Urine osmolality (mosmol/kg H2O) | 204.0 (36.9) | 681.0 (97.2) | 477.0 (132.9)* | 243.5 (88.7)* |
Urine potassium (mmol/l) | 17.2 (8.1) | 81.2 (35.1) | 64.0 (55.8) | 565.2 (631.6) |
Urine sodium (mmol/l) | 40.0 (10.7) | 43.3 (20.2) | 3.3 (29.5) | 20.9 (90.0) |
K/Na ratio in urine | 0.4 (0.1) | 4.4 (0.1) | 4.0 (6.3) | 1630.5 (2690.5) |
Transtubular potassium gradient | 2.3 (1.3) | 32.5 (8.0) | 30.2 (11.9)* | 2071.3 (1991.6)* |
Glomerular filtration rate (ml/min) | 91.9 (6.6) | 64.2 (13.3) | –27.8 (28.1) | –28.5 (26.1) |