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Percentage fall in twitch diaphragmatic pressure (ΔPdi,tw) during recovery after A: the 1st (▴), 2nd (▵) and the 3rd (♦) exercise test (irrespective of FIO2); B: the hyperoxic (FIO2:1.00 (•)), the normoxic (FIO2: 0.21 (□)) and the hypoxic exercise test (FIO2: 0.13 (○)). Values are means ±s.e.m. for 7 subjects. †Significant difference between the normoxic and the hypoxic test, P < 0.05.
