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Muscle oxy- ([HbO2], A,B), deoxy- ([HHb], C,D), and total- ([HbTot], E,F) hemoglobin concentration changes during the first (S1) and the third (S3) sustained or intermittent hypoxia sessions. Data points are means ± SD. Gray areas indicate hypoxic phases. *Significantly different from normoxic baseline in both S1 and S3 (p < 0.05, two-way ANOVA main effect of time); $Significant difference between S1 and S3 (p < 0.05, two-way ANOVA session × time interaction).
