Number of Days Required to Estimate Habitual Activity Using Wrist-Worn GENEActiv Accelerometer: A Cross-Sectional Study

Dillon, 2016

Description

Cut-points for classifying physical activity intensity from signal magnitude vector generated for adults wearing GENEActiv monitors on each wrist. Sensitivity and specificity ranged from 67.9 to 97.1% and 67.9 to 97.0%, respectively.

Development/Validation

Sample: 56 adults, 18-65 y of age

Setting: NR

Activities: Activities of daily living, stationary, walking/running

Criterion: Cosmed K4b2 (VO2)

Accelerometer(s): GENEActiv on each wrist

Validation approach: Comparison to criterion

Phase Designation

(What's this?)

This model is in Phase 1.

Instructions

SVM is calculated using the equation below as the square root of the sum of the squared acceleration in each axis, minus gravity, summed over the 15-sec epoch. However, as noted in the R package GGIR, both sets of cut-points would be sensitive to sampling rate (30 and 100 Hz in the original study), so they provide a scaled version which can be applied to any raw acceleration data.

Source Information

Reference:

Dillon, C. B., Fitzgerald, A. P., Kearney, P. M., Perry, I. J., Rennie, K. L., Kozarski, R., & Phillips, C. M. (2016). Number of days required to estimate habitual activity using wrist-worn GENEActiv accelerometer: a cross-sectional study. PloS one, 11(5), e0109913. https://doi.org/10.1371%2Fjournal.pone.0109913 Link to Paper.

Corresponding author: Christina Dillon, c.dillon@ucc.ie

Contact

Kimberly Clevenger at accelerometerrepository@gmail.com