Table 4 Lactate, pH and gases in the blood during roller-skiing with the diagonal stride (DIA) or double-poling (DP) technique at 90% VO _2max/peak

[Lactate], mmol · l ⁻¹

Femoral artery

0.8 (±0.1)

4.6 (±0.9)^¤†

7.0 (±1.6)^*†

7.9 (±2.0)^*¤†

^a F _(2,14) = 46.4, P < 0.001, power = 1.0

Femoral vein

0.7 (±0.2)

4.7 (±0.8)^¤†

5.8 (±1.7)^†

7.8 (±1.8)^*¤†

^b F _(2,14) = 29.4, P < 0.001, power = 1.0

Subclavian vein

0.8 (±0.3)

6.3. (±1.4)^¤$‡

8.2 (±1.6)^*$‡

9.1 (±2.0)^*$‡

^c F _(4,28) = 5.17, P < 0.01, power = 0.94

[Bicarbonate], mmol · l ⁻¹

Femoral artery

23.6 (±1.9)

19.2 (±1.0)^¤

17.8 (±1.4)^*

16.9 (±1.3)^*

^a F _(2,14) = 51.7, P < 0.001, power = 1.0

Femoral vein

23.5 (±1.6)

19.4 (±1.3)^¤

17.8 (±1.6)^*

16.6 (±1.2)^*¤

^b F _(2,14) = 0.081, n.s.

Subclavian vein

23.7 (±1.3)

19.4 (±1.1)^¤

17.4 (±0.8)

16.5 (±1.2)^*¤

^c F _(4,28) = 0.212, n.s.

pH

Femoral artery

7.42 (±0.01)

7.37 (±0.02)^¤‡†

7.34 (±0.03)^*†‡

7.31 (±0.04)^*¤†‡

^a F _(2,14) = 32.97, P < 0.001, power = 1.0

Femoral vein

7.38 (±0.02)

7.27 (±0.02)^¤$†

7.23 (±0.04)^*$

7.19 (±0.03)^*¤$

^b F _(2,14) = 384, P < 0.001, power = 1.0

Subclavian vein

7.37 (±0.03)

7.24 (±0.03)^¤$‡

7.21 (±0.03)^*$

7.19 (±0.03)^*¤$

^c F _(4,28) = 5.68, P < 0.01, power = 0.95

O ₂ content, ml · l ⁻¹

Femoral artery

190 (±15.2)

193 (±15.3)^†‡

192 (±27.8)^†‡

200 (±11.0)^†‡

^a F _(2,14) = 1.51, n.s.

Femoral vein

100 (±23.9)

13.4 (±4.6)^$†

22.4 (±9.9)^$†

15.6 (±10.7)^$†

^b F _(2,14) = 428, P < 0.001, power = 1.0

Subclavian vein

120 (±29.8)

36.1 (±15.0)^$‡

51.0 (±12.6)^$‡

33.2 (±11.0)^$‡

^c F _(4,28) = 2.52, n.s.

SO ₂ (%)

Femoral artery

98.3 (±0.8)

94.8 (±2.0)^¤†‡

96.0 (±1.7)^*†‡

94.3 (±2.0)^¤†‡

^a F _(2,14) = 16.28, P < 0.001, power = 0.99

Femoral vein

51.1 (±11.1)

6.5 (±2.4)^¤$†

11.2 (±5.2)^*$†

7.5 (±5.2)^¤$†

^b F _(2,14) = 1294, P < 0.001, power = 1.0

Subclavian vein

57.0 (±17.9)

16.9 (±7.5)^$‡

22.7 (±6.1)^$‡

14.7 (±5.3)^{¤ $‡}

^c F _(4,28) = 4.28, P < 0.01, power = 0.87

PO ₂ (mm Hg)

Femoral artery

111 (±15.2)

77.3 (±10.8)^¤†‡

88.1 (±11.4)^*†‡

78.9 (±9.8)^¤†‡

^a F _(2,14) = 15.47, P < 0.001, power = 0.99

Femoral vein

27.5 (±4.8)

8.8 (±2.3)^¤$†

12.6 (±3.6)^*$†

9.8 (±4.5)^¤$†

^b F _(2,14) = 471, P < 0.001, power = 1.0

Subclavian vein

32.1 (±8.7)

16.3 (±4.2)^$‡

20.0 (±3.2)^$‡

15.8 (±3.7)^$‡

^c F _(4,28) = 4.21, P < 0.05, power = 0.86

PCO ₂ (mm Hg)

Femoral artery

34.9 (±4.0)

30.5 (±2.6)^†‡

29.8 (±2.3)^†‡

29.3 (±2.3)^†‡

^a F _(2,14) = 2.04, n.s.

Femoral vein

43.5 (±4.2)

55.1 (±4.1)^$

54.8 (±3.2)^$

59.0 (±4.9)^$

^b F _(2,14) = 179, P < 0.001, power = 1.0

Subclavian vein

45.5 (±5.3)

60.3 (±7.0)^$

57.9 (±5.1)^$

59.8 (±2.9)^$

^c F _(4,28) = 2.26, n.s.