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. 2023 Apr 15;123(8):1809–1824. doi: 10.1007/s00421-023-05202-7

Fig. 4.

Fig. 4

End-tidal carbon dioxide pressures (PETCO2) at a the start of each apnea 1–5 and b at the end of apnea 1–5 in the two breathing conditions. End-tidal oxygen pressures (PETO2) at c the start of each apnea 1–5 and d at the end of apnea 1–5 in the two conditions. *p < 0.05, **p < 0.01, and ***p < 0.001 between conditions; p < 0.05, ††p < 0.01, and †††p < 0.001 compared with A1 in the same condition (n = 13)