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Table 4 Actigraph counts and VO2 at given walking speeds by calibration method

From: Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO2 using the Actigraph accelerometer

  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
  1. 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