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Blog post by Marco Altini  We have been working on adding compatibility for all new iPhone 14 models, and have already released updates for HRV4Training, HRV4Biofeedback (our deep breathing tool), and Camera HRV (our research app) Below is some data collected using an iPhone 14 Pro and compared against a chest strap, the Polar H10 The protocol consisted in the following:
HRV (rMSSD) was 61 ms via ECG (chest strap), and 62 ms via PPG (phone camera), highlighting once again the accuracy of this method. You can see the RR intervals as well, which are a perfect match between PPG from the phone camera and ECG from the chest strap  here is an example of how we would recommend holding the phone when using three (left) or two (right) cameras. In case you cannot cover both the flash and the camera at the same time, give priority to the camera, as it is sufficient to be nearby the flash.  Enjoy the update!
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