Description

The ratio of unfiltered to filtered acceleration is used to determine non-locomotive vs. locomotive activities, then activity-specific equations are used to predict METs in young children wearing a waist-worn accelerometer. Coefficient of determination (R²) was 0.846 to 0.961 and standard error of the estimate was 0.350 to 0.428 METs.

Development/Validation

Sample: 37 (19 males) healthy children, 4-6 years of age

Setting: Laboratory

Activities: Activities of daily living, overground walking and running, sports/other games, stairs, stationary

Criterion: Douglas bag (VO₂)

Accelerometer(s): Omron Active Style Pro on waist

Validation approach: Comparison to criterion

Phase Designation

(What's this?)

This model is in Phase 1.

Instructions

Synthetic acceleration was calculated (i.e., vector magnitude, square root of the sum of the squared acceleration values in each axis) before and after passing the acceleration data through a high-pass filter with a cut-off frequency of 0.7 Hz. Then, the ratio of unfiltered to filtered synthetic acceleration was used to classify activity type as non-ambulatory or ambulatory. If the ratio was over 1.16, the non-ambulatory equation was used to predict METs while the ambulatory equation was used if the ratio was less than 1.16. The article recommends the use of the ‘quadratic’ equation for non-ambulatory activities.

Source Information

Tanaka, C., Hikihara, Y., Ando, T., Oshima, Y., Usui, C., Ohgi, Y., ... & Tanaka, S. (2019). Prediction of physical activity intensity with accelerometry in young children. International Journal of Environmental Research and Public Health, 16(6), 931. https://doi.org/10.3390/ijerph16060931 Link to Paper

Corresponding author: Chiaki Tanaka, c-tanaka@obirin.ac.jp

Contact

Kimberly Clevenger at accelerometerrepository@gmail.com