Table 4.
Actigraph counts and VO2 at given walking speeds by calibration method
| Actigraph counts · min−1 | VO2 (ml · kg−1 · min−1) | |||||||
|---|---|---|---|---|---|---|---|---|
| Treadmill calibration | Track calibration | Treadmill calibration | Track calibration | |||||
| Speed (km · h−1) | mean (SE) | BPV | mean (SE) | BPV | mean (SE) | BPV | mean (SE) | BPV |
| 3.5 | 1442 (63) | 418 | 1704 (58) | 454 | 8.96 (0.30) | 2.32 | 6.86 (0.28) | 2.38 |
| 4.5 | 2567 (78) | 515 | 3036 (75) | 556 | 10.62 (0.33) | 2.73 | 8.47 (0.30) | 2.73 |
| 5.5 | 3711 (199) | 692 | 4368 (102) | 741 | 13.44 (0.38) | 3.80 | 10.86 (0.35) | 3.80 |
| 6.5 | 4846 (136) | 902 | 5700 (132) | 963 | 16.53 (0.47) | 5.75 | 14.02 (0.44) | 6.35 |
Mean = estimated mean outcome value at specific walking speed; SE = standard error of the estimated mean; BPV = Between-participant variability around the mean (expressed as standard deviations). These estimates were obtained from models similar to those presented in Table 3 with speed centered at the various calibration-trial walking speeds (3.5, 4.5, 5.5, and 6.5 km.h−1) and with a different calibration-method reference category