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Energy expenditure, intake, and deficit of ultramarathon runners presenting (white) and not presenting (grey) gastrointestinal symptoms during a multi-stage ultramarathon (a) and a 24-h continuous ultramarathon (b). Mean ± SD (MSUM n = 54 and 24 h n = 22): **p < 0.01 and *p < 0.05 vs. no-GIS
