Table 1: Exercise parameters due to incremental exhaustive exercise at the three CO2 levels.

Air (n=8) 3% CO2 (n=8) 6% CO2 (n=8)
Performance time (min) 16'20" ± 1'27" 16'04" ± 1'41" 14'24" ± 1'37"*†
Maximal workload (W) 251.3 ± 15.5 247.5 ± 31.1 228.8 ± 27.5

Values are means ± SD. *P<0.05 vs Air. P<0.05 vs 3% CO2 .