Hi there, @Ahartl. Welcome to the Community Forums. Thanks for trying to troubleshoot the issue with your Versa before reaching out. I understand where your concern is coming from.
To better assist you with this matter and provide you with the assistance you need, may I know the steps you've tried so far?
Keep in mind that several factors can affect heart rate, including air temperature, stress level, alcohol or caffeine intake, immune response to illness, and medication use (source).
Exercising in cold weather can make it more difficult for your device to track your heart rate, as environmental conditions can affect skin perfusion (the amount of blood that flows through your skin). Spikes in your heart rate during sleep may be caused by sudden movements (for example, waking up and getting out of bed), or a weak signal due to wrist placement.
As with all heart-rate tracking technology, accuracy is affected by personal physiology, device location on your arm, and type of movement. For a more accurate heart-rate reading:
- Wear your Fitbit device on top of your wrist, and make sure the back of the device is in contact with your skin.
- When you’re not exercising, wear your device a finger’s width above your wrist bone.
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During exercise, wear your device a bit tighter and higher for an improved fit. The band should be snug but not constricting (a tight band restricts blood flow, potentially affecting the heart-rate signal). 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.
To resolve common issues, see our troubleshooting steps in What factors can affect my heart-rate reading on my Fitbit device?
Hope this helps.
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