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Table 1 Criterion and Fitbit-estimated step counts (upper panel) and energy expenditure (lower panel) across treadmill speeds

From: Validation of the Fitbit One® for physical activity measurement at an upper torso attachment site

Exercise phase Observed step counts (steps)a Fitbit One® upper torso Fitbit One® hip Fitbit Flex® wrist
Estimated step counts Percent error Estimated step counts Percent error Estimated step counts Percent error
Slow walk (1.9 mph) 98.2 ± 7.4 94.4 ± 6.8 −3.1 ± 7.8 96.2 ± 7.6* −1.5 ± 2.8 83.2 ± 25.1* −15.8 ± 27.9
Moderate walk (3.0 mph) 117.7 ± 6.1 117.0 ± 6.4 −0.6 ± 1.3 116.9 ± 6.4 −0.6 ± 1.2 106.2 ± 14.9* −10.2 ± 12.3
Brisk walk (4.0 mph) 132.8 ± 7.4 132.1 ± 6.8 −0.2 ± 1.3 132.1 ± 7.0 −0.2 ± 1.4 117.4 ± 20.1* −11.8 ± 14.7
Running (5.2 mph) 164.6 ± 8.9 164.2 ± 9.3 −0.1 ± 1.2 163.0 ± 9.9 −0.9 ± 2.9 161.2 ± 12.4 −2.1 ± 5.7
  1. Data presented as mean ± standard deviation
  2. * Significantly different from criterion at P ≤ 0.001
  3. Significantly different from Upper Torso attachment site at P ≤ 0.001
  4. aManually counted by two observers from a video recording and averaged; 1-min epoch
  5. bMeasured by gas exchange indirect calorimetry; 1-min epoch
Exercise phase Measured energy expenditure (kcal)b Fitbit One® upper torso Fitbit One® hip Fitbit Flex® wrist
Estimated energy expenditure (kcal) Percent error Estimated energy expenditure (kcal) Percent error Estimated energy expenditure (kcal) Percent error
Slow walk (1.9 mph) 2.8 ± 0.5 2.5 ± 0.4* −9.7 ± 14.9 2.6 ± 0.4* −7.8 ± 15.2 5.2 ± 1.4* 83.4 ± 45.2
Moderate walk (3.0 mph) 3.8 ± 0.8 4.4 ± 1.0* 17.7 ± 37.2 4.1 ± 1.1 12.9 ± 43.3 6.4 ± 0.8* 68.3 ± 29.9
Brisk walk (4.0 mph) 5.6 ± 1.4 6.4 ± 1.2* 19.9 ± 44.2 6.0 ± 1.2 12.1 ± 45.0 7.2 ± 1.4* 29.4 ± 33.2
Running (5.2 mph) 8.3 ± 2.6 9.5 ± 2.4 10.8 ± 35.3 7.9 ± 1.2 −3.4 ± 32.8 10.6 ± 1.3* 24.5 ± 28.0
  1. Data presented as mean ± standard deviation
  2. * Significantly different from criterion at P ≤ 0.001
  3. Significantly different from Upper Torso attachment site at P ≤ 0.001
  4. aManually counted by two observers from a video recording and averaged; 1-min epoch
  5. bMeasured by gas exchange indirect calorimetry; 1-min epoch