Table 1

Representative examples from Bergeron2 of sweat loss, fluid intake (water only) and consequent postplay body water and sodium (Na+) deficits incurred from 1.5 and 4 h of singles match-play

1.5 h of play4 h of play
Sweating rate (L/h)Sweat [Na+] (mmol/L)Fluid intake rate (L/h)Body water deficit (L)Total-body Na+ deficit (mg)Body water deficit (L)Total-body Na+ deficit (mg)
Player 12.040.01.11.427593.67357
Group mean2.644.51.61.539904.010 640
Player 23.460.82.31.771294.419 010