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wrist-based heart rate monitors
Optical sensors on wearable devices that estimate heart rate by measuring blood flow through the skin on the wrist.
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"I went down the rabbit hole on this a year ago of looking at every single one of the wrist-based heart rate monitors and I was blown away at how inaccurate wrist-based heart rate monitors were."
Attribution: Peter Attia clearly expresses negative sentiment about the accuracy of these devices after researching them extensively