Table 16. Cross-validation of Measured vs. Predicted VO2peak, from submaximal 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 ± 8.2 | 47.9 ± 6.7 | 3.14 | 10.7 | 12.5 | 142 (21.6) | 50.7 ± 8.8 | 47.5 ± 6.9 | 3.44 | 12.4 | 14.0 | 150 (22.1) |
| 40-60 | 43.9 ± 8.1 | 44.9 ± 5.9 | -1.03 | 14.0 | 14.0 | 362 (55.5) | 44.3 ± 8.1 | 45.0 ± 5.9 | -0.62 | 12.7 | 12.7 | 364 (53.5) |
| >60 | 37.8 ± 7.1 | 40.7 ± 6.5 | -2.86 | 13.7 | 16.0 | 149 (22.9) | 36.9 ± 7.7 | 40.2 ± 6.1 | -2.97 | 16.4 | 18.6 | 166 (24.4) |
| VO2peak | ||||||||||||
| <35 | 31.4 ± 3.1 | 37.4 ± 5.4 | -5.94 | 9.0 | 25.4 | 102 (15.6) | 31.0 ± 3.2 | 37.2 ± 5.6 | -6.32 | 9.9 | 27.2 | 116 (17.1) |
| 35-50 | 42.8 ± 4.1 | 43.8 ± 4.8 | -0.93 | 8.9 | 11.4 | 374 (57.3) | 42.7 ± 4.3 | 43.5 ± 4.7 | -0.81 | 8.7 | 10.7 | 375 (55.1) |
| >50 | 55.8 ± 5.1 | 50.5 ± 5.6 | 5.41 | 7.5 | 13.2 | 177 (27.1) | 56.2 ± 4.9 | 50.4 ± 5.2 | 5.69 | 7.9 | 13.4 | 189 (27.8) |
| Velocity | ||||||||||||
| <5 | 36.0 ± 6.7 | 37.1 ± 4.9 | -0.86 | 14.4 | 16.3 | 97 (14.9) | 34.9 ± 6.3 | 36.2 ± 5.0 | -1.14 | 15.5 | 16.7 | 119 (17.5) |
| 5-6 | 43.8 ± 7.9 | 44.2 ± 4.5 | -0.37 | 14.0 | 14.0 | 456 (69.8) | 43.9 ± 7.9 | 44.4 ± 4.1 | -0.42 | 14.4 | 14.5 | 455 (66.9) |
| >6 | 52.8 ± 8.0 | 54.0 ± 5.6 | -1.14 | 12.6 | 12.7 | 100 (15.3) | 52.9 ± 8.2 | 53.9 ± 5.5 | -1.01 | 11.9 | 12.1 | 106 (15.6) |
| Total | 44.3 ± 9.1 | 44.6 ± 6.7 | -0.27 | 14.0 | 14.0 | 653 | 44.3 ± 9.5 | 44.4 ± 6.7 | -0.09 | 14.2 | 14.2 | 680 |
VO2peak were categorized into 3 groups from measured VO2peak; <35, 35–50, >50 (mL kg-1 min-1) and <30, 30–40, >40 (mL kg-1 min-1) were cutoff values for men and women, respectively; velocity: treadmill velocity (km h-1).