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Changes in exercise load and RPE during 30 min of endurance exercise at the same HR level (136.5 ± 1.5 bpm) under normoxia (760 mmHg) and hypoxia (526 mmHg, simulated 3000 m). (A) Exercise load, (B) RPE. HRmax: maximal heart rate; RER: rating of perceived exertion. The bars indicate the mean ± S.D. *: Significant difference within the environmental condition (normoxia vs. hypoxia) during 30 min of endurance exercise.
