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We investigated whether acute carbohydrate ingestion reduced arterial potassium concentration ([K ]) during and after intense exercise and delayed fatigue. In a randomized, double-blind crossover design, eight males ingested 300ml water containing 75g glucose (CHO) or placebo (CON); rested for 60min, then performed high-intensity intermittent cycling (HIIC) at 130% V ˙ O 2peak , comprising three 45-s exercise bouts (E, then a fourth EB until fatigue. Radial arterial (a) and antecubital venous (v) blood was sampled at rest, before, d