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Within 100% O2 ventilation, the absolute magnitude of negative reflection (Γ) increases. Significant Bonferroni multiple comparisons: within 100% O2, low vs. high ***(P = 0.005); within low volume load, 100% O2 vs. hypoxia *(P = 0.040); within high volume load, 100% O2 vs. nitric oxide **(P = 0.035).
