How Accurate Are Wrist-Worn Heart Rate Monitors?
Heart rate monitors have become indispensable tools for runners and fitness enthusiasts. Most smartwatches and fitness bands use wrist-based optical sensors, known as photoplethysmography (PPG). In one study, an evaluation was conducted on how accurate these wrist-worn devices are—both at rest and during exercise—for people in normal heart rhythm (sinus rhythm) and those with atrial …
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