3 november 2022 kl 13:13
"Pretty much all smartwatches and wearables that measure heart rates do so through the use of photoplethysmography. In the case of the Apple Watch, this is where a green light is omitted and projected on to the arm and then the changes in light absorption (how much light is reflected back to the sensor) are what’s actually measured. This then allows the device to calculate a heart rate measurement. Due to how the technology works, anything that can reflect light is likely to fool a smartwatch into giving out a false reading. Although, in reality, it is not even a false reading as the device is only measuring the light absorption, and not anything else. What’s more, due to the fact that different objects reflect varying levels of light, the effect can be repeated on different things with a variety of results and leading to the impression that everything around us has a unique heart rate. The better an object is at reflecting light, the more likelihood that the Apple Watch will provide a heart rate reading."
