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. 2000 Jan 1;522(Pt 1):159–164. doi: 10.1111/j.1469-7793.2000.t01-2-00159.xm

Table 1. Arterial and jugular venous variables at rest and in response to cycling for six humans.

Rest Exercise Recovery
Below lactate threshold Above lactate threshold 0–5 min 5–30 min
Pa,CO2(kPa) 5.49 ± 0.31 5.57 ± 0.17 5.18 ± 0.22* 4.70 ± 0.32* 4.99 ± 0.37*
pHa 7.41 ± 0.01 7.41 ± 0.01 7.37 ± 0.02* 7.28 ± 0.04* 7.33 ± 0.05*
pHv 7.35 ± 0.01 7.35 ± 0.01 7.31 ± 0.02* 7.22 ± 0.05* 7.28 ± 0.05*
[Hb]a (mmol l−1) 8.61 ± 0.78 9.05 ± 0.55* 9.51 ± 0.74* 9.56 ± 0.73* 8.94 ± 0.82*
[Hb]v(mmol l−1) 8.85 ± 0.67 9.11 ± 0.66* 9.63 ± 0.67* 10.00 ± 0.52* 9.08 ± 0.73*
Sa,O2 (%) 97.2 ± 0.5 96.9 ± 0.3 96.4 ± 0.6 96.8 ± 0.6 96.3 ± 1.3
Sv,O2 (%) 59.3 ± 2.7 60.1 ± 1.6 58.5 ± 3.6 54.9 ± 4.1 54.6 ± 4.8
Ca,O2 (mmol l−1) 8.37 ± 0.76 8.77 ± 0.55* 9.16 ± 0.73* 9.25 ± 0.68* 8.60 ± 0.71*
Cv,O2 (mmol l−1) 5.25 ± 0.51 5.47 ± 0.47* 5.63 ± 0.50* 5.48 ± 0.37 4.94 ± 0.45
[O2] a–v dif. (mmol l−1) 3.11 ± 0.30 3.30 ± 0.14 3.50 ± 0.50 3.77 ± 0.52* 3.62 ± 0.64*
‘Corrected’, CO2 (mmol l−1) — 3.39 3.21 3.04 3.17
[Glu]a (mmol l−1) 5.37 ± 0.71 5.18 ± 0.45 4.89 ± 0.22 5.54 ± 0.47 5.06 ± 0.44
[Glu]v (mmol l−1) 4.82 ± 0.73 4.56 ± 0.46 4.25 ± 0.18 4.70 ± 0.44 4.44 ± 0.47
Glu a–v dif. (mmol l−1) 0.55 ± 0.06 0.62 ± 0.06 0.61 ± 0.13 0.83 ± 0.10* 0.58 ± 0.09
‘Corrected’, CO2 (mmol l−1) — 0.63 0.56 0.67 0.50
‘Corrected’, O2 (mmol l−1) — 0.58 0.53 0.65 0.49
[Lac]a (mmol l−1) 0.90 ± 0.37 0.92 ± 0.26 3.85 ± 0.83* 7.13 ± 2.19* 4.53 ± 2.12*
[Lac]v (mmol l−1) 0.88 ± 0.30 0.92 ± 0.26 3.40 ± 1.04* 6.65 ± 1.98* 4.02 ± 2.22*
Lac a–v dif. (mmol l−1) 0.02 ± 0.08 0.01 ± 0.03 0.39 ± 0.13* 0.48 ± 0.24* 0.24 ± 0.15*
‘Corrected’, CO2 (mmol l−1) — 0.01 0.36 0.39 0.21
‘Corrected’, O2 (mmol l−1) — 0.01 0.34 0.38 0.20
(Glu + Lac/2) a–v dif. (mmol l−1) 0.56 ± 0.09 0.62 ± 0.05 0.78 ± 0.13* 1.07 ± 0.13* 0.70 ± 0.11
‘Corrected’, CO2 (mmol l−1) — 0.63 0.73 0.87 0.61
‘Corrected’, O2 (mmol l−1) — 0.59 0.70 0.85 0.59
O2/Glu a–v dif. 5.95 ± 0.68 5.43 ± 0.39 6.02 ± 1.39 4.93 ± 0.99* 6.48 ± 1.53
O2/(Glu + Lac/2) a–v dif. 5.84 ± 0.73 5.36 ± 0.33 4.42 ± 0.25* 3.79 ± 0.30* 5.32 ± 0.61

Values are means ± S.D. a, arterial value; v, venous value. dif., difference. PCO2, carbon dioxide tension; pH, pH of blood; Hb, haemoglobin; SO2, haemoglobin saturation; [O2], O2 content of blood; Glu, glucose; Lac, lactate. ‘Corrected’, a–v difference related to a 30% change in cerebral blood flow per kPa change in Pa,CO2 or a constant cerebral a–v dif. O2.

*

P < 0.05, compared to rest.