Calibration of the GENEA accelerometer for assessment of physical activity intensity in children
Phillips, 2013
Description
Three sets of cut-points for classifying physical activity intensity from signal magnitude vector (gravity subtracted) were generated using receiver operating characteristics (ROC) analysis for adults wearing GENEA monitors on the right hip and each wrist. Sensitivity and specificity ranged from 82 to 96% and 83 to 98%, respectively.
Development/Validation
Sample: 44 children, 8-14 y of age
Setting: Laboratory
Activities: Active video games, stationary, treadmill walking/running
Criterion: Cosmed K4b2 (VO2)
Accelerometer(s): GENEA on right hip, each wrist
Validation approach: Comparison with criterion
Instructions
Signal magnitude vector (gravity subtracted) per 1-sec was calculated as square root of the sum of the squared acceleration in each axis, minus gravity. Below are the developed cut-points. However, as noted in the R package GGIR, these cut-points are sensitive to sampling rate, so they provide a scaled version which can be applied to any raw acceleration data.
Source Information
Reference:
Phillips, L. R., Parfitt, G., & Rowlands, A. V. (2013). Calibration of the GENEA accelerometer for assessment of physical activity intensity in children. Journal of Science and Medicine in Sport, 16(2), 124-128. https://doi.org/10.1016/j.jsams.2012.05.013 Link to Paper.
Corresponding author: Lisa Phillips, Lrsp201@exeter.ac.uk
Contact
Kimberly Clevenger at accelerometerrepository@gmail.com