We will now prepare the ECG sites. The electrodes used here will record the participant's heart rhythm overnight.
There are three locations on the torso:
lower left ribs
left upper chest just below the collar bone
right upper chest just below the collar bone
If there is hair over these areas, shave it before proceeding.
Swab each area first then return to each with the abrasive gel for 30 seconds.
Once the area is dry (or after using a discarded alcohol wipe to remove excess gel), attach 1x square electrodes to each site.