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Fructose is a carbohydrate that is often used by athletes in particular because its intake does not release insulin.
However, several studies have indicated that fructose intake just before the race is not to be convenient because it does not save the consumption of glycogen or not improve sports performance.*
One explanation that can be given for these effects may be related to its metabolism, as it is absorbed and catabolized for energy more slowly than glucose.
*from: "Alimentazione per lo sport e la salute di Pierluigi BIagi, Antonio Di Giulio, Amelia Fiorilli, Antonello Lorenzini".