The patches can be mounted anywhere on the body, but some signals can only be recorded in certain locations.
If you’ve received a wired ECG/RES patch, pictured below, make sure to attach to standard off-the-shelf ECG electrodes.
We recommend placing the short-end electrode on the sternum, and the long-end electrode at a distance of approximately 12-15 cm away from the former as show in the diagram:
The best signal amplitude will be achieved by mimicking a Lead II in a standard 6-lead ECG, which amounts to an angle of approximately 60 degrees relative to the shoulders. This will also work for the respiration Role. Check the Signal Quality guide for more information.
The temporary patch is just that … temporary. You will soon receive disposable ECG/RES patches like this:
They will operate exactly as the wired version but will be disposable and will not require additional ECG electrodes.
The IMU and PPG Patches look quite alike so make sure you grab the right one. The PPG Patch can be distinguished from the IMU patch by the LED array and the bottom. The IMU patch, on the other hand, has no sensor array in the opening. When in doubt, place a Sensor Dot configured as a PPG Role in the Patch. If it’s a PPG patch you will see a green and red LED light up. In theory, the PPG Patch can be placed anywhere but we recommend the following locations for best signal quality:
Note that both skin-tone and body type may influence the quality of the signal and some experimentation may be needed. Check the Signal Quality guide for more information.
The IMU Patch is a simply adhesive mount. It’s placement is completely dependent on the application:
Note that areas of high impact (e.g. ankles during running) may show increased signal saturation. Check the Signal Quality guide for more information.