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Experimental features

There are a few additional tools in the Acceleration Viewer that are still considered experimental (in Beta stage).

Create activity plot

The activity plot provides an alternative way to view the acceleration data that is helpful for identifying daily (or 2-day) activity patterns. To create an activity plot, select Experimental > Create activity plot.

The plot shows a summary of the data over 24-hour periods (or, click on Show 48 hours to view in 2-day periods).

Export ODBA

ODBA is the abbreviation for “overall dynamic body acceleration”. Select Experimental > Export ODBA to export a csv file containing the raw acceleration burst data along with calculated ODBA.

The following steps are applied to calculate the ODBA value for a burst of raw acceleration data from an e-obs tag:

  1. Calculate the static value per burst.
  2. Subtract the static value from the measurement, take the absolute value, and sum them up.

Then the following calculation is performed for each burst ‘B’, where

  • ‘B’ is the burst with n samples.
  • ‘x(1..n)’, ‘y(1..n)’ and ‘z(1..n)’  are the x, y and z components of all of the acceleration samples in the burst.
  • ‘sum’ is Σ with i=1 to n.
xmean = sum( x(i) ) / n
ymean = sum( y(i) ) / n
zmean = sum( z(i) ) / n
ODBA(B) = sum(|x(i)-xmean|) + sum(|y(i)-ymean|) + sum(|z(i)-zmean|)

Viewing heart rate (ecg) data

If your e-obs tags include heart rate sensors, you can open and view the data collected by selecting Experimental > Open Ecg file. You can then export these data in csv format by selecting Experimental > Export heart rate as CSV.