Scientists from the University of Bath in the UK assessed the impact of endurance exercise on liver glycogen levels (stored carbohydrates in the body) and tested what could be done to prevent fatigue.
They tested various sucrose- and glucose-based drinks to see how different carbohydrates could help.
Their experiment, conducted on long-distance cyclists, showed that ingesting carbohydrates in the form of either glucose or sucrose prevents the decline in liver glycogen 'carbohydrate stores' and can avert tiredness.

Combining different sources of sugars improves the rate at which we can absorb these from the gut, the researchers said.
The researchers warn that such glucose-only drinks could produce gut discomfort and suggest sucrose-based alternatives, or sugar in water, can help make exercise easier.
The study was published in the American Journal of Physiology - Endocrinology and Metabolism.


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