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Time course changes in muscle deoxygenation (HHb) status in active muscles (vastus lateralis) and saturation of skeletal muscle (StO2) in inactive muscles (biceps brachii) for a typical single subject. Gray lines indicate PL and black lines indicate BR trials, respectively. a.u., arbitrary unit; EXsub, submaximal leg cycling exercise; EXmax, incremental leg cycling exercise. Arrows indicate at the point of exhaustion.
