Apple Watch Hrv-Capable?

From the announcement info given today:

"On the back of the case, a ceramic cover with sapphire lenses1 protects a specially designed sensor that uses infrared and visible-light LEDs and photodiodes to detect your heart rate."


Will this tech be sensitive enough from the wrist to detect HRV in a meaningful way? For anyone that doesn't currently own a high-quality HRM, the price of this Apple product effectively comes down.




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