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Minute ventilation (V˙E; A), tidal volume (VT; B) and breathing frequency (f; C) throughout the hyperoxic (FIO2: 0.26; •), the normoxic [FIO2: 0.21; ○) and the two hypoxic exercise tests (FIO2: 0.17; ▪; FIO2: 0.13; □). Values are means ± s.e.m. for 8 subjects.
