The Low Frequency Extension (LFE) option, though not a mode or channel, is another data collection option during device initialization and, for the GT3X+, during post-processing. The Normal proprietary filter algorithm used in ActiGraph products is used to eliminate any acceleration noise outside of the normal human activity frequency bandwidth.
This filter is customized to work with ActiGraph’s Energy Expenditure Algorithms. The LFE option, when enabled, extends the lower end (baseband) of the filter cutoff, effectively expanding the bandwidth of the accumulated data. This option is useful when measuring actigraphy data for subjects who move slowly or take very light steps (for example, the elderly). For more details,
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