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H2-breath test for the evaluation of orocecal transit time. Hydrogen excretion kinetic profiles obtained in the H2-breath test (BT) for the evaluation of the orocecal transit time performed during the Baseline Data Collection period (•) and during the mission simulation (experimental session 1: ◦; experimental session 2: ▪; experimental session 3: ▫). This BT was performed simultaneously with the 13C-octanoic acid BT for the evaluation of the gastric emptying rate of solids (A-F).
