Description

Logarithmic equation to predict METs from thigh-worn activPAL data in adults. R² was 0.68 with an absolute error of 18 ± 13% in the laboratory cross-validation. When compared to a pedometer during free-living, absolute error was 14.5 ± 16.0 and 7.1 ± 15.1 minutes per day for moderate and vigorous activity, respectively.

Development/Validation

Sample: 40 (16 males) adults, 25 ± 6 years of age

Setting: Laboratory, free-living

Activities: Treadmill walking, free-living

Criterion: Indirect calorimetry for laboratory model development (VO₂), PiezoRxD for free-living cross-validation portion

Accelerometer(s): activPAL3 on right thigh

Validation approach: Holdout (n=20)

Phase Designation

(What's this?)

This model is in Phase 1 and 3.

Instructions

activPAL counts per 15-sec are used as the input to the logarithmic equation 1.85*e^{(0.00005*counts)} to predict METs. This corresponds to cut-points of 8810(moderate) and 22621 (vigorous) counts.

Source Information

Reference:

O'Brien, M. W., Wu, Y., Johns, J. A., Poitras, J., & Kimmerly, D. S. (2021). Development and validation of an activPAL accelerometry count-based model of physical activity intensity in adults. Medical Engineering & Physics, 95, 45-50. https://doi.org/10.1016/j.medengphy.2021.07.014 Link to paper

Corresponding author: Myles O'Brien, myles.obrien@dal.ca

Contact

Kimberly Clevenger at accelerometerrepository@gmail.com