Table 1. Cardiovascular and cerebral metabolic variables after 20 mins of submaximal cycling (124±21 W) or after cycling exercise to exhaustion (279±75 W).
| Rest | Submaximal | Exhaustion | |
|---|---|---|---|
| HR (beat per minute) | 90±11 | 133±13*** | 164±13*** |
| MAP (mm Hg) | 93±5 | 102±5** | 100±5** |
| MCA Vmean (% of rest) | 100±0 | 112±12 | 107±19 |
| O2 a-v Diff (mmol) | 3.5±0.3 | 3.1±0.4* | 4.1±0.4*** |
| PaCO2 (kPa) | 5.0±0.5 | 5.0±0.4 | 3.8±0.4*** |
| PvCO2 (kPa) | 6.4±0.5 | 6.5±0.4 | 5.6±0.3*** |
| CO2 a-v Diff (mmol) | 3.6±0.3 | 3.6±0.3 | 4.4±0.2*** |
| Glca (mmol/l) | 5.8±0.3 | 5.5±0.3 | 5.7±0.4 |
| Laca (mmol/l) | 1.2±0.3 | 1.7±0.8 | 10.8±1.7*** |
| Glc a-v Diff (mmol/l) | 0.6±0.1 | 0.6±0.1 | 0.8±0.1** |
| Lac a-v Diff (mmol/l) | −0.1±0.1 | −0.1±0.1 | 0.8±0.2*** |
| OGI | 5.8±0.9 | 5.4±1.2 | 5.4±0.9 |
| OCI | 6.2±0.7 | 6.1±0.6 | 3.8±0.5*** |
HR, heart rate; MAP, mean arterial pressure; MCA Vmean, middle cerebral artery mean flow velocity; *, **, and ***, different from rest P<0.05, P<0.01, and P<0.001, respectively. Values are mean±s.d.