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- Ventilation index during exercise under 3 conditions
surgical mask urethane mask no mask p value Ti (sec) 1.02±0.18 0.92±0.16 0.85±0.16 0.001 RR (rate/min) 30.44±6.82 32.41±6.76 34.28±7.47 0.01 ETCO2 (%) 6.58±0.49 6.42±0.46 6.30±0.53 0.001 VE/VO2 26.21±2.90 27.53±2.75 28.22±3.29 0.05
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