How Accurate Are Fitness Tracker Heart Rate Monitors?

Fitness trackers with heart-rate monitors are popular these days, but how accurate are they, really? A new study put these devices to the test, and the heart-rate monitors' scores were not stellar — some of these wrist-worn heart-rate monitors were more accurate than others, but not one was as accurate as a chest strap monitor, the researchers found. "If you really must know your heart rate accurately — whether that's for health or training — a chest strap with an electrode is