ActiGraph ACTITRAINER Instrukcja Użytkownika Pobierz pdf (Strona 16)

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Lux Level Interpretation Comparison

1 Twilight

5 Minimal street light

10 Sunset

50 Family living room

80 Hallway

100 Very dark overcast day

320-500 Office lighting

400 Sunrise/sunset

1,000 Overcast day

10,000-25,000 Full daylight

32,000-130,000 Direct sunlight

Table 2 – Lux Level Interpretation Estimates

Low Frequency Extension

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, contact ActiGraph at

support@theactigraph.com.

GT3X+ Caveats

The GT3X+ product represents the next generation of ActiGraph actigraphy devices. The device architecture is different

than other products sold by ActiGraph in the following ways:

Data Collection

During initialization, the user chooses the raw data sample frequency (30Hz up to 100Hz in 10Hz increments). The

GT3X+ collects data from all on-board sensors in raw data format (see

Available Channels (Modes) for more

information). Data recorded includes:

• Vertical Axis Activity Acceleration Data (Axis 1)

• Horizontal Axis Activity Acceleration Data (Axis 2)

• Perpendicular Axis Activity Acceleration Data (Axis 3)

• Ambient Light (Lux)

Although Steps and Inclinometer are not directly measured during data collection, these values

can be derived from the 3-axis data during *.gt3x file decompression.

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ActiGraph ACTITRAINER Instrukcja Użytkownika Strona 16