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Rate of carbohydrate intake during running of ultramarathon runners presenting (GIS) and not presenting (no-GIS) gastrointestinal symptoms during a multi-stage ultramarathon (MSUM) and a 24-h continuous ultramarathon (24 h). Values compared to carbohydrate intake recommendation for glucose (short broken line) and glucose-fructose (long broken line) [43]. Mean ± SD (MSUM n = 54 and 24 h n = 22): **p < 0.01 vs. no-GIS
