Research
Hormonal
Restoring blood glucose levels during exercise via infusion eliminates hypoglycemic symptoms but does not significantly extend performance time, indicating that cerebral hypoglycemia is not the sole limiter of endurance performance.
Drinking glucose during exercise helps prevent feeling dizzy or weak from low blood sugar, but it won't necessarily help you run longer if your muscles have already run out of glycogen. Focus on eating enough carbs before your event.
GoodRefutesHIGH confidence
Glucose infusion eliminated hypoglycemic symptoms but did not substantially increase performance time.
Why this rating
Direct measurement of performance time and symptoms with glucose infusion.
Source
The effect of different diets and of insulin on the hormonal response to prolonged exercise
H. Galbo et al. · Acta Physiologica Scandinavica · 1979
DOI 10.1111/j.1748-1716.1979.tb06438.x
crossover · n=7Cited 253×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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