Instead, our autonomic nervous system varies the timing between each beat, balancing its two branches: the sympathetic (fight-or-flight) and parasympathetic (rest-and-digest).Įveryone’s HRV depends on various factors, including age, gender, hormone levels, sleep quality, physical fitness, diet and nutrition, lifestyle choices (such as caffeine, alcohol, and drug use), and genetics. Our hearts do not steadily beat like a metronome. In simple terms, your heart rate variability (HRV) is the time in milliseconds between each heartbeat. Scroll down to the section Heart rate variability (HRV.) In the Fitbit app, open the Today tab and tap Health Metrics.If time is short and you don’t need a thorough step-by-step, follow these quick instructions and check out your HRV metrics from your Fitbit! 5 Are you looking for daytime and nighttime HRV measurements?.4 Are you not getting accurate HRV on your Fitbit?.3.1 Are you concerned about your HRV numbers from your Fitbit?.3 How to check your HRV (heart rate variability) on Fitbit.

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