Table 1

 Body mass, plasma sodium (Na+), potassium (K+), and chloride (Cl) concentrations, and urine specific gravity measured two days before the race, immediately before the race, after the race, and 12 hours after the race

2 days beforeBeforeAfter12 h after
Values are mean (SD).
*p<0.05 compared with 2 days before the race.
†p<0.05 compared with immediately before the race.
‡p<0.05 compared with after the race.
Body mass (kg)77.7 (5.4)78.5 (5.5)*76.2 (5.5)†77.3 (5.9)
[Na+] (mmol/l)139.0 (0.7)137.6 (2.0)137.0 (3.6)139.6 (1.1)‡
[K+] (mmol/l)4.2 (0.2)4.9 (0.6)*4.6 (0.6)4.0 (0.3)‡
[Cl] (mmol/l)106.3 (1.4)107.5 (2.0)106.1 (3.8)106.1 (1.2)
Urine specific gravity (g/ml)1.011 (0.005)1.017 (0.008)†