Similarly, with exercises such as weight lifting or rowing, your wrist muscles may flex in such a way that the band tightens and loosens during exercise.
With high-intensity interval training, P90X, boxing, or other activities where your wrist is moving vigorously and non-rhythmically, the movement may prevent the sensor from finding an accurate heart rate. That being said, the device should also be slightly tighter (snug but not constricting) during exercise than during all-day wear. Do not wear your device too tight a tight band restricts blood flow, potentially affecting the heart-rate signal. Make sure the device is in contact with your skin. Many exercises such as bike riding or weight lifting cause you to bend your wrist frequently, which could interfere with the heart-rate signal if the watch is lower on your wrist. Experiment with wearing the device higher on your wrist during exercise for an improved fit and more accurate heart-rate reading. Fitbit’s PurePulse heart-rate tracking system is designed to be most accurate when the device is worn on the top of your wrist.įor improved heart-rate accuracy keep these tips in mind: When you’re not exercising, wear your device a finger’s width below your wrist bone. I can suggest a few tips to make sure you'll get the best heart rate readings out of your tracker.Īs with all heart-rate tracking technology, whether a chest strap or a wrist-based sensor, accuracy is affected by personal physiology, location of wear, and type of movement. I think that in order for your activity to be recognized correctly most of the time, it's important that your tracker has a steady access to your heart rate. I'm sorry to hear that your workouts are not being reported accurately. Hi there Welcome to the Fitbit Community Forums! 
Moderator edit: Updated title for clarity I wear a chest band for the orangetheory class which is always more accurate than a wrist count. It seems the monitor is only accurate at moderate heart rates and can’t measure the really intense workout. I’ve tried doing the start workout option and lowering the minimum time for recognizing a workout to 10min, but the issue is that in that class it underestimates my heart rate.
It says I burned 120cals which is like a gentle stroll. The whole workout falls on the Fitbit “cardio and peak” zones, but Fitbit reports my heart rate at 90-120, with most of the time registering as around 100. But the hardest thing I do by far is orangetheory and I typically have 25-35 minutes in the orange and red (84-95%max HR) zones and 20-25 minutes in the green zone (72-83%maxhr) -usually burning 550-600s cals. I have an elliptical and it usually measures that accurately with mostly cardio and a little time in peak zone. I have a Fitbit Alta and it accurately measures steps and miles and the heart rate report on the hikes fits what I feel -cardio uphill and fat burning on the flats unless I push pace a lot. I have been an avid exerciser for years but new to Fitbit.
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