HRV4Biofeedback's unique camera based measurement was scientifically validated and showed to be equivalent to chest strap measurements (Polar H7) as well as electrocardiography. Check out also the imagee below where we show a comparison of peaks detected from a full ECG (Cosmed, reference system) and PPG data acquired using our technology To make the most of your measurement, make sure to follow these guidelines for all your measurements:
As first time users, try to take 2-3 measurements following the advice above, and you should be able to acquire high quality data rather easily. WHICH CAMERA SHOULD I USE?Regardless of how many cameras your iPhone has, only one camera is the main camera used by the app. In the app, you can figure out really quickly what camera you should use, as you can see the camera view during the measurement. If you see a red dot as below, then you are covering the right camera, because that's your finger
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