How Fitbit tracks your HRVįitbits currently track your HRV when you sleep and do not offer a way to track HRV during the day.įitbit chooses to track HRV overnight because, during the daytime, many other outside factors influence HRV, including workouts and even things like how much caffeine you drink.Īdditionally, measuring your HRV when relaxed and sleeping tends to show a higher and more accurate measure of your body’s recovery from the day’s activities, stress, and other factors. A lower HRV (relative to your baseline) is associated with greater sympathetic responses (fight-or-flight.) Lower HRV points to stress (good and bad), overtraining, illness, and even depression or anxiety.įor more information on Fitbit and HRV ranges by age and gender, see this recent clinical study on Fitbits.A higher HRV (relative to your baseline) is associated with greater parasympathetic responses (rest-and-digest.) A higher HRV points to greater cardiovascular fitness, better resilience to stress, quicker recovery, and more restful sleep.That’s why knowing your baseline HRV is essential and then looking at the variations (higher or lower) based on that baseline. Because there is no standard HRV, you need to look and compare your HRV to yourself and not others. So, don’t compare your HRV to others’ HRV!Ī normal HRV can fall anywhere from below 20 to over 200 milliseconds between beats. 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?.
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