Fluid replacements after squash: an analysis of the effects of several fluid regimens on exercise-related metabolic...

We studied the effects of several fluid replacements taken after squash on exercise-related metabolic responses. 12 subjects played 5 games and after each game were assigned one of the following, receiving a different one each time: (1) no fluid replacement, or 500 ml of (2) water, (3) electrolyte solution, (4) glucose solution or (5) a glucose/electrolyte 'sports' drink. Circulating levels of lactate, free fatty acids, glucose, potassium, sodium and plasma osmolality were measured at rest and at 5, 15, 30 and 60 min after games. There were significant changes over time for all measured variables (p < 0.001). The only effect of these drinks was by the glucose-containing drinks, which resulted in significant elevation of blood glucose levels (p < 0.001); no effects on circulating electrolyte levels were demonstrated. In conclusion, while fluid replacements may increase glucose levels, electrolyte levels are not affected by drinks which are commonly used after squash.