Physiological measurements
| Variable | CFS patients n=66 | Depressed patients n=15 | Sedentary controls n=30 | ANOVA p Value |
| Test duration (min) | 10 (8–12) | 12 (9–15) | 13.5 (11–16) | 0.001 |
| Peak oxygen uptake (ml/kg/min) | 30.6 (8.2) | 30.9 (6.7) | 34.1 (6.8) | 0.13 |
| Maximum ventilation (l/min) | 69.8 (57–83) | 70.0 (56–84) | 82.4 (66–87.5) | 0.09 |
| Maximum heart rate (beats/min) | 171 (18) | 172 (18) | 182 (14) | 0.01 |
| Recovery heart rate (beats/min) | 117 (17)) | 113 (22) | 109 (17) | 0.17 |
| Predicted maximum heart rate (%) | 91.6 (8.8) | 91.5 (7.6) | 97.5 (5.2) | 0.002 |
| Submaximal blood lactate (mmol/l) | 2.8 (1.6–4.0) | 2.8 (1.7–3.8) | 3.5 (2.2–4.8) | 0.005 |
| Post-test blood lactate (mmol/l) | 5.4 (2.2) | 6.3 (2.7) | 6.8 (2.1) | 0.02 |
| Maximum voluntary quadriceps contraction (Newtons) | 310 (234–386) | 401 (315–487) | 442 (364–518) | 0.0001 |
Values are mean (SD)) or median (interquartile range).