Is 52 bpm resting normal?
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A normal resting heart rate for most people is between 60 and 100 beats per minute (bpm). A resting heart rate slower than 60 bpm is considered bradycardia.
What is a dangerously low heart rate at rest?
When the heart does not operate as it is supposed to and develops an abnormally slow heart rate that is less than 60 beats per minute, the condition is known as bradycardia. Bradycardia can be life threatening if the heart is unable to maintain a rate that pumps enough oxygen-rich blood throughout the body.
Is 52 bpm too low during sleep?

For most young people, highly trained athletes, and people who work out regularly, a low heart rate while exercising — defined as below 60 bpm — is normal and healthy. The same goes for your nightly snooze. When you’re asleep, your heart rate normally slows down to 40 to 60 beats a minute.
When should I be concerned about sinus bradycardia?
While sometimes sinus bradycardia may not need treatment, it can also be a sign of serious health conditions that need attention. Always seek emergency medical care if you experience chest pain that lasts longer than a few minutes, trouble breathing, or fainting.
Should I be concerned if my resting heart rate is 50?
60 to 100 bpm: The normal resting heart rate (or pulse rate). 50 to 59 bpm: A good indicator that your heart is functioning normally if you are not feeling dizzy or ill. 40 to 50 bpm: The normal resting heart rate for athletes, otherwise it is considered low.

Is fitbit accurate for resting heart rate?
Compared with the ECG reading, wearable products varied in their accuracy. The Fitbit Charge performed the best at rest, measuring within 5 beats per minute of the ECG reading 95% of the time. The Basis Peak activity tracker was shown to be within 22.6 bpm of the ECG reading during the 10-minute resting test.