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Peripheral oxygen saturation (SpO2) (A) and cortisol (B) and erythropoietin (EPO) (C) concentrations after a 90 min nap under normoxic (NN) and hypoxic conditions (NH15: FiO2 14.7, NH13: FiO2 12.5) in healthy men (n = 7) and women (n = 8). Data as mean ± SEM. *p < 0.05, **p < 0.001 (Linear Mixed Model). Frequency of high concentration of epinephrine and dopamine (D). Missing data due to blood specimen damage during processing.
