Steps; Inclinometer - ActiGraph wGT3X-BT User Manual

Steps

Step counts are accumulated on a per-epoch basis and are based on accelerometer data collected on
the vertical axis. An algorithm present in the device firmware filters out the accelerometer's baseline
noise level to help accurately accumulate the steps-per-epoch.

Inclinometer

The inclinometer feature can help users identify the orientation of the device and, more importantly,
when the device itself was taken off. Each epoch is flagged with a number (1 through 4) to indicate the
orientation of the device during that epoch. For wGT3X-BT devices, this is done within the ActiLife
software when converting the *.gt3x file to *.agd format. As noted, the inclinometer feature is only
valid when the device is worn vertically on the point of the hip. More details are available in the
Inclinometer Whitepaper.
Important The inclinometer feature is only valid if the device is worn on the hip
with Axis 1 upward facing.
(Stored with each Epoch)
49 E. Chase St.
100
320-500
400
1,000
10,000-25,000
32,000-130,000
Table 1 – Lux Level Interpretation Estimates
Inclinometer Code
0
1
2
3
Table 3 - Inclinometer Definitions
Pensacola, FL 32502
Very dark overcast day
Office lighting
Sunrise/sunset
Overcast day
Full daylight
Direct sunlight
Interpretation
Device Off (Not Being Worn)
Subject Standing
Subject Lying Horizontal
Subject Sitting
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