Classify adult ENMO with Hildebrand cut-points — acti_threshold

Classifies one-second, raw ActiGraph GT3X+ ENMO values in mg from adults as light-or-less, moderate, or vigorous physical activity. The source used a 60-Hz device at the right hip or non-dominant wrist; select the matching placement and do not apply these adult thresholds to children.

Usage

acti_threshold_hildebrand(
  data,
  placement = c("wrist", "hip"),
  name = "hildebrand_intensity",
  enmo = "enmo"
)

acti_threshold_hildebrand_wrist(..., placement = "wrist")

acti_threshold_hildebrand_hip(..., placement = "hip")

Arguments

data: A data frame with a time and an ENMO column.
placement: Body placement used in the original calibration: "hip" or "wrist".
name: Name of the added ordered factor column.
enmo: Name of the ENMO column, in mg.
...: not used, but used to pass arguments to acti_threshold_hildebrand from acti_threshold_hildebrand_wrist and acti_threshold_hildebrand_hip

Value

data with an ordered factor column named by name.

Details

Hildebrand et al. report lower bounds of 69.1 and 258.7 mg at the hip, and 100.6 and 428.8 mg at the wrist, for moderate and vigorous activity, respectively doi:10.1249/MSS.0000000000000289.

References

Hildebrand M, van Hees VT, Hansen BH, Ekelund U. Age group comparability of raw accelerometer output from wrist- and hip-worn monitors. Medicine & Science in Sports & Exercise. 2014;46(9):1816-1824. doi:10.1249/MSS.0000000000000289.