HT204666: Your heart rate. What it means, and where on Apple Watch you’ll find it.
Learn about Your heart rate. What it means, and where on Apple Watch you’ll find it.
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May 13, 2015 5:15 AM in response to DGee4by jaredfs,I'm guessing it wouldn't work as reliably but would still read reasonably well. The sensors read color changes in through your skin that indicate oxygenation is occurring below the surface. It's been designed and tuned to read at your wrist, which I assume has veins closer to the surface and therefore more easily detected by the sensors, but I'm sure the same changes occur to a lesser extent further up your arm.
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May 13, 2015 5:48 PM in response to DGee4by SoGood,Don't see any reason why it would not work, even on your chest. As long as the optical sensors are in contact with normal skin where there's dermal blood flow, it would work.