HR/RR: ECG interval extraction

To export an excel spreadsheet with cardiac data, go to Analysis → ECG interval extraction → select CH9, ECG → excel spreadsheet only → ok

The resulting spreadsheet contains beat-to-beat R-R intervals (time in seconds between two cardiac cycle peaks) and heart rate for each cycle.

1. Import into Matlab

This is to plot the shape of the cardiac response curve.

2. Compute variables across the whole task period

This is mostly relevant for Rest and Meditation, where there are no challenge responses.

Compute the means and standard deviation of the R-R and HR columns:

1. Click in an empty cell, type “=AVERAGE()” → inside the parentheses, select your column values from top to bottom

2. Do the same for “=STDEV”

3. “=MEDIAN”

4. “=MIN”

5. “=MAX”