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Hyperoxia increases maximal attainable power and arterial oxygen saturation. (A) denotes the change in maximal attainable power during incremental exercise to exhaustion in hyperoxia compared to normoxia, (B) is the maximal heart rate at exhaustion, (C) is maximal capillary lactate concentrations 3 min after completion of the incremental test, and (D) is the arterial oxygen saturation measured in an earlobe during the last minute of the incremental test. ***P < 0.001
