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During intensive training sessions and exhausting sports matches, isotonic sports drinks ensure that the body is optimally supplied with energy, fluids, salt and electrolytes. As a result, they have a positive influence on performance and muscle function during sport. The Swiss Sports Nutrition Society defines an isotonic drink as a drink whose osmolarity is similar to that of blood. This means that the concentration of electrolytes and other particles (e.g., glucose) corresponds to that of human blood, which favours particularly rapid absorption in the gut.
