Activity Counts from a Raw GENEActiv .bin File

Reads a raw GENEActiv (.bin) accelerometer file and converts it to ActiGraph-equivalent activity counts via the agcounts implementation of the ActiGraph count algorithm (Neishabouri 2022). Requires the GGIRread and agcounts packages.

Usage

geneactiv.counts(path, epoch = 60, lfe = FALSE, tz = "UTC")

Arguments

path

Path to a .bin file.

epoch

Epoch length in seconds (default 60).

lfe

Use the low-frequency extension filter (default FALSE).

tz

Time zone for the timestamps (default "UTC").

Value

Data frame with time, axis1, axis2, axis3 and vm, one row per epoch.

Cross-brand counts

These are an approximation of ActiGraph counts, not native ActiGraph output, and GENEActiv-to-count conversion is not empirically validated (only theoretically motivated by the shared filter). GENEActiv records at about 85.7 Hz, which is resampled to 30 Hz before the count filter. Appropriate for the relative and normalized circadian metrics here (IS, IV, RA, L5, M10, SRI); do not apply ActiGraph cut-points or compare absolute counts across brands.

References

Neishabouri A, Nguyen J, Samuelsson J, Guthrie T, Biggs M, Wyatt J, Cross D, Karas M, Migueles JH, Khan S, Guo CC (2022). “Quantification of acceleration as activity counts in ActiGraph wearable.” Scientific Reports, 12, 11958. doi:10.1038/s41598-022-16003-x .

Brond JC, Andersen LB, Arvidsson D (2017). “Generating ActiGraph counts from raw acceleration recorded by an alternative monitor.” Medicine & Science in Sports & Exercise, 49(11), 2351–2360. doi:10.1249/MSS.0000000000001344 .

See also

axivity.counts, gt3x.counts, read.raw