There are apps like Instant Heart Rate and Cardiograph which claim to be able to measure heart rate by reading color changes on arterial pressure change. They generally require you to place your finger over the flash led and camera.
From my tests the values don't quite match rates measured traditionally (by feeling arterial pressure changes, counting them over 10 seconds and multiplying by 6) but I'm not a physician so I might be measuring incorrectly.
So, are these apps more precise than I can be or is it the other way around?
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