Table 2.
Arterial (a) and internal jugular venous (v) blood derived variables
 (%) |
0.21 | 0.21 | 0.10 | 0.21 | 0.21 | |
|---|---|---|---|---|---|---|
| Workload (W) | Rest | 124 ± 21 | 124 ± 21 | 226 ± 38 | 279 ± 75 | |
| Workload (% of max) | Rest | 44 ± 8% | 44 ± 8% | 81 ± 13% | 100% | |
| pH | a | 7.42 ± 0.02 | 7.4 ± 0.02* | 7.43 ± 0.03 | 7.39 ± 0.02** | 7.36 ± 0.02*** |
| v | 7.35 ± 0.02 | 7.35 ± 0.01 | 7.39 ± 0.03*** | 7.33 ± 0.02** | 7.3 ± 0.03*** | |
 (mmHg) |
a | 36 ± 1 | 38 ± 2*** | 25 ± 2*** | 34 ± 2** | 28 ± 2*** |
| v | 48 ± 3 | 48 ± 2 | 32 ± 2*** | 47 ± 3* | 42 ± 2*** | |
 (mmHg) |
a | 100 ± 6 | 94 ± 6* | 30 ± 4*** | 90 ± 6*** | 91 ± 8*** |
| v | 31 ± 2 | 34 ± 3*** | 21 ± 2*** | 30 ± 3 | 31 ± 3 | |
 (%) |
a | 98 ± 1 | 98 ± 0 | 58 ± 5*** | 97 ± 1 | 97 ± 1 |
| v | 58 ± 4 | 64 ± 3*** | 36 ± 4*** | 55 ± 6 | 52 ± 3*** | |
| P50 (mmHg) | a | 25.7 ± 0.6 | 26.2 ± 0.5 | 26 ± 0.9 | 26.4 ± 0.9 | 28.5 ± 1.4*** |
| v | 27.5 ± 1.4 | 27.6 ± 1.2 | 26.9 ± 1.8 | 28.0 ± 1.5 | 29.6 ± 2*** | |
| h | a | 2.90 ± 0.05 | 2.91 ± 0.05 | 2.64 ± 0.04*** | 2.84 ± 0.07 | 2.86 ± 0.04 |
| v | 2.70 ± 0.03 | 2.71 ± 0.04 | 2.54 ± 0.03*** | 2.69 ± 0.06 | 2.77 ± 0.06* |
, inspiratory oxygen fraction; 
and 
, partial pressures of carbon dioxide and oxygen, respectively; 
, haemoglobin oxygen saturation; P50, partial pressure of oxygen where haemoglobin is half saturated; h, Hill's coefficient. *, ** and ***, different from rest, P < 0.05, P < 0.01 and P < 0.001, respectively. Values are means ±s.d.