Table 9. Cross-validation of Measured vs. Predicted VO2peak, from peak measurements, in men: The HUNT 3 fitness study.
| Validation sample | Cross-validation sample | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measured VO2peak | Predicted VO2peak | CE | %SEE | %TE | N (%) | Measured VO2peak | Predicted VO2peak | CE | %SEE | %TE | N (%) | |
| Age (yr.) | ||||||||||||
| <40 | 50.9 ± 8.6 | 51.2 ± 7.2 | -0.34 | 8.6 | 8.6 | 274 (24.8) | 50.8 ± 8.4 | 51.2 ± 7.8 | -0.43 | 9.3 | 9.5 | 276 (23.8) |
| 40-60 | 43.9 ± 8.0 | 43.8 ± 6.6 | 0.14 | 10.4 | 10.4 | 610 (55.4) | 44.3 ± 8.3 | 44.5 ± 6.9 | -0.17 | 10.5 | 10.5 | 621 (53.6) |
| >60 | 37.4 ± 8.1 | 37.5 ± 6.2 | -0.07 | 13.2 | 13.2 | 218 (19.8) | 37.3 ± 6.8 | 37.4 ± 5.7 | -0.10 | 12.1 | 12.2 | 261 (22.6) |
| VO2peak | ||||||||||||
| <35 | 31.0 ± 3.4 | 34.5 ± 4.3 | -3.54 | 8.5 | 16.0 | 189 (17.2) | 31.4 ± 3.0 | 34.6 ± 4.1 | -3.20 | 8.5 | 15.7 | 199 (17.2) |
| 35-50 | 42.9 ± 4.3 | 43.1 ± 5.2 | -0.26 | 7.8 | 9.8 | 616 (55.8) | 42.7 ± 4.1 | 43.1 ± 5.4 | -0.40 | 7.6 | 10.1 | 650 (56.1) |
| >50 | 56.0 ± 5.0 | 53.3 ± 5.7 | 2.70 | 6.5 | 9.2 | 297 (27.0) | 56.0 ± 5.0 | 53.9 ± 5.7 | 2.10 | 7.1 | 9.3 | 310 (26.7) |
| Velocity | ||||||||||||
| <7 | 31.0 ± 5.8 | 31.4 ± 3.5 | -0.44 | 15.0 | 15.0 | 93 (8.4) | 32.7 ± 4.8 | 32.2 ± 3.0 | 0.54 | 11.3 | 11.3 | 116 (10.0) |
| 7-10 | 40.9 ± 6.2 | 40.9 ± 4.0 | 0.11 | 11.4 | 11.4 | 621 (56.4) | 41.0 ± 6.2 | 41.0 ± 4.1 | 0.04 | 11.0 | 11.0 | 639 (55.1) |
| >10 | 53.0 ± 6.5 | 53.1 ± 4.7 | - 0.14 | 8.4 | 8.4 | 388 (35.2) | 52.8 ± 7.0 | 53.6 ± 5.0 | -0.82 | 9.7 | 9.8 | 404 (34.9) |
| Total | 44.4 ± 9.3 | 44.4 ± 8.1 | -0.03 | 10.4 | 10.4 | 1102 | 44.3 ± 9.2 | 44.5 ± 8.3 | -0.21 | 10.5 | 10.5 | 1159 |
VO2peak were categorized into 3 groups from measured VO2peak; <35, 35–50, >50 (mL kg-1 min-1) were cutoff values for men; velocity: treadmill velocity (km h-1).