Step-count mean absolute percent errors during treadmill walking: Setting an acceptable tolerance-for-error
ISPAH ePoster Library. Moore C. Oct 16, 2018; 225261; 352
Mr. Christopher Moore
Mr. Christopher Moore
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Abstract The emergence of physical activity (PA) monitors has enabled the development of objective-based PA guidelines and improved evaluations of PA interventions. These monitors commonly utilize steps as a simple and communicable output. Still, there is a need to develop validation standards for such devices, including setting acceptable tolerances-for-error. PURPOSE: To evaluate the mean absolute percent error (MAPE) of multiple step-counting devices at various treadmill walking speeds, and aggregate results to determine an empirically-based tolerance-for-error. Methods:<\b>
Eighty adults (mean±SD; age=50.2±5.9 years; BMI=26.0±4.0 kg/m2) performed 5-minute treadmill walking bouts, beginning at 0.22m/s (0.5mph) and increasing in 0.22m/s increments until a maximum speed of 2.24m/s (5.0mph). Participants concurrently wore ten step-counting devices: five waist (ActiGraph GT9X, Actical, Digiwalker SW-200, NL-1000, Fitbit One), three wrist (Apple Watch Series 1, Samsung GearFit 2, Garmin VivoFit 3), one thigh (ActivPAL), and one ankle (StepWatch). Directly-observed steps served as the criterion measure. MAPE was calculated for each device at each speed, and device MAPEs were averaged at each speed. RESULTS: Step-count accuracy was highest between walking speeds of 1.10–1.54m/s (2.5-3.5mph), evidenced by the lowest average MAPE values (<3%). Average MAPEs from 0.88–1.76m/s (2.0-4.0mph) were consistently ≤5.2%. Very slow walking speeds (≤0.66m/s; 1.5mph) had the highest average MAPEs (16.3–80.4%). CONCLUSION: For moderately-slow to fast walking speeds (0.88–1.76m/s), current PA monitors attain an MAPE below 5%, with an MAPE below 3% at normal walking speeds (1.10-1.54m/s). Newly-developed devices should be validated with a tolerance-for-error that meets or improves upon this current standard. External funding details NIH/NIA Grant 5R01AG049024-CADENCE-Adults study
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