An interesting app from Marco Altini.
HRV measurement by using the camera on your iPhone (not Android). Some models (iPhone 5 or 6) can take HRV-accurate readings from your finger suing the phone’s camera effectively as a heart rate monitor.
Here are some more links if you want to find out more. Click on the icon and it will take you to the store on iTunes.
http://www.hrv4training.com/blog/orthostatic-hrv-measurements-training-and-recovery
http://www.hrv4training.com/blog/heart-rate-variability-using-the-phones-camera
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