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The expired δ 13CO2 versus VPDB in participants provided 1.8 g/min carbohydrate (CHO, n = 8, 65.25 g fructose + 79.75 g glucose, closed symbols, during 80-min steady-state exercise (treadmill walking) at sea level (SL) and at 4,300 m altitude, within 5–7 h after arrival (acute high-altitude, AHA) and again on the 22nd day of continuous residence at high-altitude (chronic high-altitude, CHA).
