Table 2. Body mass loss, heart rate, rate of perceived exertion (Borg scale), concentration of blood glucose, blood lactate, plasma free fatty acids (FFA), plasma glycerol and serum sodium, potassium and chloride during the study in carbohydrate-electrolyte (CHOE) and water trial. Values are mean (SD). *Statistically significant at P < 0.05 for CHOE vs. water trial Time Trial Rest (0 min) End of I half (45 min) End of II half (90 min) 1st min of recovery (91 min) End of recovery (150 min) Body mass loss CHOE - 0.3 (0.3)* 0.9 (0.3)* - 0.2 (0.1)* (kg) Water - 0.5 (0.3) 1.4 (0.5) - 0.4 (0.2) Heart rate (beats·min-1) CHOE 62.8 (5.0) 154.6 (18.5) 164.7 (12.8) 105.2 (8.0)* 65.7 (4.5) (beats·min-1) Water 63.3 (5.6) 162.9 (11.8) 170.2 (14.4) 113.1 64.9 (5.3) (10.0) Rate of perceived CHOE 6.5 (0.7) 12.9 (1.2) 14.4 (1.1)* - 7.1 (0.7)* exertion Water 6.2 (0.4) 13.6 (1.6) 17.1 (1.4) - 7.5 (0.6) Blood glucose CHOE 4.2 (0.4) 4.8 (0.2)* 4.4 (0.3)* - 4.3 (0.3) (mmol·l-1) Water 4.3 (0.4) 4.6 (0.4) 4.0 (0.3) - 4.2 (0.2) Blood lactate CHOE 1.0 (0.3) 3.1 (0.2) 2.3 (0.4) - 1.3 (0.4) (mmol·l-1) Water 1.0 (0.3) 2.8 (0.2) 2.5 (0.2) - 1.3 (0.5) Plasma FFA CHOE 0.5 (0.1) 0.4 (0.1) 0.9 (0.2) - - (mmol·l-1) Water 0.5 (0.1) 0.5 (0.1) 0.9 (0.1) - - Plasma glycerol CHOE 64.7 (6.4) 267.3 (19.1)* 406.0 (44.5) - - (µmol·l-1) Water 64.0 (9.1) 301.3 (24.4) 422.7 (27.9) - - Serum sodium CHOE 135.8 (1.6) - 140.4 (2.4) - - (mmol·l-1) Water 136.3 (1.5) - 141.4 (2.5) - - Serum potassium CHOE 4.5 (0.3) - 4.9 (0.3) - - (mmol·l-1) Water 4.5 (0.1) - 5.0 (0.2) - - Serum chloride CHOE 98.2 (1.0) - 101.9 (2.1) - - (mmol·l-1) Water 97.7 (1.4) - 100.9 (1.6) - -