The data table in the *agd database consist of the following parameters. Their calculations are explained.
dataTimeStamp – a measure of total Ticks. A single tick represents one hundred nanoseconds or one ten-millionth of a second. There are 10,000 ticks in a millisecond. The value of this property represents the number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight, January 1, 0001. More information available at
Microsoft.
axis 1 – Post filtered and accumulated per-epoch vertical activity data
axis 2 (optional) – Post filtered and accumulated per-epoch horizontal activity data
axis 3 (optional) – Post filtered and accumulated per-epoch perpendicular activity data
steps (optional) – Total steps per epoch
hr (optional) – Heart beats-per-epoch. This data is only gathered by ActiTrainer devices when those devices are initialized to collect heart rate data AND when the Polar® Heart Monitor (wireless heart strap) is worn by the user.
Lux (optional) – Ambient light sampled once per second (on GT3X+ and ASM devices only) and averaged over the length of the selected epoch. (e.g., for 60s epochs, this would be the light values summed once per second and divided by 60).
Inclinometer (optional) – Device orientation information. This is calculated by sampling the angle of the device over the entire length of the epoch (30 times per second) and selecting the predominant angle; i.e, the angle “range” that appeared the majority of the time over the epoch.