Fluid loss and dehydration are also of concerns for soccer players. Many games are played during warm, sunny weather, which increases fluid losses. Most players usually only replace half of the fluids they lose through sweat during a game or practice, but performance can suffer with losses of as little as 2% of body weight (2 lbs for a 110-lb athlete).
To prevent dehydration, players should begin each practice session or game fully hydrated by drinking water or a sport drink every 15-20 minutes during warm-up. Sport drinks are helpful because the flavor often motivates athletes to drink more, while supplying energy.
When play stops (when a goal is scored or the ball goes out of bounds), players may take the opportunity to sip on fluid. Placing water bottles along the sidelines and near each goal will make this much easier.
Lastly, soccer players should always practice their fluid replacement and fueling strategies in training so that it will become automatic for games. Fluid replacement strategies are most effective when based on body weight changes from pre- to post-game or practice.
Players should avoid losing more than 1-2% of their body weight during games or practices, especially in the heat.