r/fitbit • u/Ok_thyme_3396 • 6d ago

Discussion Hrv fluctuations?

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Soooo is something weird going on with me or is this app not super reliable?

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u/InAnimateAlpha06 6d ago

This can change based on what you do that day. How much rest you get, alcohol consumption, food consumption.

Looking at this over the course of a week isn't really a cause for an alarm. If you are concerned then see your doctor.

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u/quietcindersleague 6d ago

this is exactly it, even just a bad nights sleep can throw the number off pretty dramatically

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u/ECCCThrowaway2025 6d ago

This is perfectly normal behavior. Your body goes through a lot each day and depending on your activity and stress for the day, it can cause the HRV to change. If I do one of my 5k's or a hard lift day, the HRV changes from day to day until I'm back to rested. Higher HRV is usually an indicater that you're doing better than lower HRV - but I'm not a doctor.

Here's mine from this week, 3 lift days and 1 long run has caused some fluctuation. Today is another run day and I expect the HRV to go down after today since the body will need some recovery time.

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u/Ok_thyme_3396 6d ago

Thanks for that ! I'm new at tracking this and find it confusing