Fitbit PurePulse™ trackers help you get the heart rate stats you want, right on your wrist—automatically, all-day, during workouts and beyond—with no need for an uncomfortable chest strap.
Like all heart-rate monitoring technologies, accuracy is affected by physiology, location of device, and different movements. To get the most accurate heart rate reading during workouts, follow these three steps:
Since blood increases further up your arm, wear your tracker higher on your wrist to improve the heart rate signal during workouts. Start by moving the device up to three finger widths above your wrist bone, then experiment with slightly lower placement.
The less your tracker moves during exercise, the more chance you have of maintaining a heart rate signal throughout the activity. Do not wear the band too tightly, as this can restrict blood flow and goes against our wear and care guidelines.
High intensity exercises or activities that cause you to keep your wrist bent (like push-ups) or move your arms vigorously (like dance) may interfere with heart rate signals. If you stop seeing a signal during these types of activities, hold your wrist steady for ten seconds during breaks to get your reading.
However you choose to get in a good sweat, checking your heart rate during exercise helps you gauge your effort and adjust workouts on the spot to ensure you’re pushing yourself hard enough without overtraining.