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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