Physical Activity Intensity Cut-Points for Wrist-Worn GENEActiv in Older Adults
Fraysse, 2021
Description
Cut-points for signal vector magnitude (SVM) minus gravity per 5- or 60-sec for GENEActiv monitors worn on each wrist by older adults (≥70 years of age). Across wear locations, sensitivity and specificity were 90-99% and 64-91%.
Development/Validation
Sample: 36 (18 males) older adults, ≥70 years of age
Setting: Laboratory
Activities: Activities of daily living, overground walking, stationary
Criterion: MetaMax 3B (VO2)
Accelerometer(s): GENEActiv on each wrist
Validation approach: Comparison to criterion
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 epoch. The original study provides cut-points that were scaled to a 60-sec epoch, and "epoch independent" cut-points. However, as noted in the R package GGIR, both sets of cut-points would be sensitive to sampling rate (100 Hz in the original study), so they provide a scaled version which can be applied to any raw acceleration data.
Source Information
Reference:
Fraysse, F., Post, D., Eston, R., Kasai, D., Rowlands, A. V., & Parfitt, G. (2021). Physical activity intensity cut-points for wrist-worn GENEActiv in older adults. Frontiers in sports and active living, 2, 579278. https://doi.org/10.3389/fspor.2020.579278 Link to paper
Corresponding author: François Fraysse, francois.fraysse@unisa.edu.au
Contact
Kimberly Clevenger at accelerometerrepository@gmail.com