The greatest hyperhydration occurred in the study of Montner et al. Begin exercise one hour later. In theory, though, a sports drink like Gatorade should be just as good. Athletes should note well that the side effects of headaches and blurred vision may occur with higher doses. Conclusions and Further Research Drinking a glycerol solution before a long hot endurance event is probably worthwhile for those athletes who don't drink enough fluid before and during the event.
More research is needed to determine whether there is any benefit for athletes who do drink well.
Drinks containing salt need to be looked at, because salt can also prolong hydration. Finally, the exercise tests need to simulate more closely the demands of real endurance and ultraendurance events in conditions that clearly challenge fluid balance. Sustained hyperhydration with glycerol ingestion. Thermoregulatory effects during compensable exercise-heat stress. Effects of glycerol-induced hyperhydration prior to exercise in the heat on sweating and core temperature.