Table 2 Respiratory variables during steady-state moderate exercise in room air, He-O₂, Ar-O₂, and SF₆-O₂ breathing.

33.12 ± 2.26

34.52 ± 2.68

31.21 ± 1.61

32.36 ± 1.81

31.97 ± 2.45

33.55 ± 2.24

2.03 ± 0.11

1.90 ± 0.12*

1.91 ± 0.16

2.08 ± 0.20

2.00 ± 0.20

2.58 ± 0.28**

1.83 ± 0.19

1.61 ± 0.18

1.78 ± 0.18

1.86 ± 0.21

1.82 ± 0.22

2.16 ± 0.20*

1.94 ± 0.22

1.80 ± 0.16

1.90 ± 0.15

2.02 ± 0.21

2.04 ± 0.24

2.39 ± 0.25*

3.77 ± 0.39

3.40 ± 0.32*

3.68 ± 0.32

3.89 ± 0.40

3.86 ± 0.45

4.55 ± 0.43*

17.2 ± 1.1

19.1 ± 1.2*

17.3 ± 1.5

16.9 ± 1.7

17.1 ± 1.5

1 4.4 ± 1.5*

44.8 ± 1.1

44.7 ± 1.0

43.9 ± 0.7

44.1 ± 0.7

45.7 ± 0.7

46.4 ± 1.1

1.56 ± 0.10

1.88 ± 0.13*

1.59 ± 0.09

1.82 ± 0.09

1.52 ± 0.10

1.46 ± 0.12*

1.74 ± 0.16

1.04 ± 0.07**

1.86 ± 0.14

2.04 ± 0.16*

1.87 ± 0.20

3.84 ± 0.42**

0.60 ± 0.09

0.37 ± 0.48**

0.59 ± 0.07

0.68 ± 0.09*

0.62 ± 0.01

1.34 ± 0.18**

129.1 ± 12.9

91.4 ± 8.5**

122.3 ± 13.5

138.2 ± 15.9*

117.8 ± 13.2

289.3 ± 33.7**