What Is a Good HRV for Your Age? Understanding Normal HRV Ranges

Author: Lisette Portes, MD, Board-Certified Family Medicine Physician

Published / Last Reviewed: November 3, 2026 / Medically reviewed by Lisette Portes, MD

Normal HRV by age has no single cutoff, because values depend on age, sex, fitness, the metric, and the device. HRV generally declines with age. In a 1998 Holter study by Umetani and colleagues, average 24 hour RMSSD fell from 43 ms in people in their 20s to 25 ms in their 50s. Your own trend matters more than any chart. Learn what HRV measures and what low HRV means.

What Is Normal HRV by Age, and Why Is There No Single Good Number?

Normal HRV by age is a wide range rather than a single target, because heart rate variability depends on age, sex, genetics, fitness, and how it is measured. A 2010 systematic review by Nunan and colleagues pooled 44 studies of 21,438 healthy adults and found very large differences between individuals, especially for frequency measures. The metric matters too. RMSSD, the beat-to-beat measure most apps report, gives smaller numbers than SDNN, which captures overall variability. Recording length changes values as well, since a 24 hour SDNN is far higher than a 5 minute SDNN in the same person. That is why a good HRV for a 30 year old athlete can look very different from a good HRV for a healthy 65 year old. The most useful comparison is your current trend against your own stable baseline, measured the same way each time.

How Much Does HRV Decline With Age?

HRV declines steadily with age, and the beat-to-beat measures that reflect vagal activity fall fastest in early and middle adulthood. The clearest age data come from a 1998 study by Umetani and colleagues in the Journal of the American College of Cardiology. They recorded 24 hour Holter ECGs in 260 healthy people aged 10 to 99. RMSSD fell to 47 percent of its teenage value by the sixth decade and then leveled off. SDNN declined more gradually, reaching about 60 percent of baseline by the tenth decade. A 2020 analysis of about 8 million Fitbit users led by Natarajan confirmed the same pattern with wrist sensors, with RMSSD declining faster than overall variability. The averages below are from Umetani's 24 hour ECG data. They are not wearable scores, and they should not be applied to 5 minute or overnight app readings.

Ages 10 to 19: SDNN 176 ms, RMSSD 53 ms (24 hour Holter means).
Ages 20 to 29: SDNN 153 ms, RMSSD 43 ms.
Ages 30 to 39: SDNN 143 ms, RMSSD 35 ms.
Ages 40 to 49: SDNN 132 ms, RMSSD 31 ms.
Ages 50 to 59: SDNN 121 ms, RMSSD 25 ms.
Ages 60 to 99: SDNN 106 to 124 ms, RMSSD 21 to 24 ms.

Do Women and Men Have Different Normal HRV Ranges?

Women and men do have somewhat different HRV patterns, but the differences are small, depend on the metric, and shrink with age. In the Umetani study, women under 30 had lower HRV than men on every time domain measure. The gap narrowed after 30 and disappeared after 50. A 2016 meta-analysis by Koenig and Thayer, covering nearly 300,000 healthy participants and summarized by Shaffer and Ginsberg, found that women tend to have a higher resting heart rate and lower SDNN. Women also showed higher high frequency power, which suggests relatively greater vagal activity. A 2024 conference abstract by Leng and colleagues, using under-mattress sensors in 38,475 adults, also found that both RMSSD and SDNN fell with age and that women had lower SDNN. Because these sex differences are modest, your own baseline remains the better comparison.

What Are the Published Normal HRV Ranges for Short Recordings?

For 5 minute resting ECG recordings, the best summary of normal values in healthy adults comes from the 2010 review by Nunan and colleagues. They reported average SDNN of about 50 ms and average RMSSD of about 42 ms. The ranges below are the spread of average values across the included studies, not the range for individual people. Many participants were measured lying down, under free or paced breathing, which raises some values. Shaffer and Ginsberg note that three large study populations aged 40 and older may have pulled the averages down. These numbers were lower than the older 1996 Task Force norms, partly because of methods. Short recordings are closer to what an app measures than 24 hour Holter data, but wearable values still cannot be compared directly, because most use pulse sensors rather than ECG.

SDNN: mean 50 ms (SD 16), study averages 32 to 93 ms.
RMSSD: mean 42 ms (SD 15), study averages 19 to 75 ms.
HF power: mean 657 ms² (SD 777), study averages 83 to 3,630 ms².
LF power: mean 519 ms² (SD 291), study averages 193 to 1,009 ms².
LF to HF ratio: mean 2.8, study averages 1.1 to 11.6.

Why Can't You Compare Your Wearable HRV With Charts or Other Devices?

Wearable HRV scores cannot be compared reliably with published charts or other brands, because each device measures at different times, with different sensors, and with its own processing. Most rings and watches use photoplethysmography, a light-based pulse sensor. A 2025 study of 931 adults by Kantrowitz and colleagues found that pulse-based readings consistently underestimated ECG values for RMSSD and SDNN. A 2021 WHOOP validation study by Bellenger and colleagues found that measurement error for RMSSD approached or exceeded normal day-to-day variation. Timing matters too. Fitbit data showed HRV peaks in the early morning and is lowest in the evening. Some apps report an overnight average, others the deepest sleep window, and others a morning spot check. The practical answer is to build a personal baseline with one device and one routine, then watch the trend.

Use the same device and the same measurement time, ideally overnight or right after waking.
Track a 7 day rolling average rather than single daily scores.
Note alcohol, late meals, illness, travel, hard training, and poor sleep alongside readings.
Look for sustained changes over 1 to 2 weeks, not daily swings.

What Should Clinicians Know About Normative HRV Data?

Clinicians should treat published HRV norms as method-specific reference points, not universal cutoffs, and match any comparison to recording length, posture, breathing, and signal source. The 24 hour data from Umetani and colleagues show that in subjects over 65, SDNN index, rMSSD, and pNN50 fell below published mortality-risk cutoffs in 25, 12, and 4 percent of healthy people. Age-unadjusted thresholds can therefore misclassify older patients. Prognostic SDNN thresholds such as below 50 ms derive from 24 hour Holter data after myocardial infarction, as reported by Kleiger and colleagues in 1987, and do not apply to short-term or PPG-derived values. Nunan and colleagues found up to 260,000 percent interindividual variation in some spectral measures and frequent failure to report RR editing. HRV is also heart rate dependent, and ectopy, arrhythmias, and beta blockers alter results. Use intraindividual change, not population percentiles, for most patient decisions.

How Can an Integrative, Physiology-Focused Doctor Help You Interpret Your HRV?

An integrative, physiology-focused doctor can help you understand whether your HRV trend fits your age, health, and lifestyle, and what may be behind a change. Dr. Lisette Portes is a board-certified family medicine physician in Miami who views health through the lens of the autonomic nervous system. Patients can bring wearable HRV data to a visit and discuss sleep, stress, exercise, medications, and chronic conditions that can shape their numbers. HRV is reviewed alongside your symptoms, exam, and standard testing, never as a diagnosis on its own. Learn about primary care or an annual physical exam, offered in English and Spanish, with telehealth for patients located in Florida. Contact the office or call 305-328-5079. Call 911 for chest pain, fainting with injury, or stroke signs. This article is general education, not medical advice.

Frequently Asked Questions About Normal HRV by Age

What is a good HRV for my age?

A good HRV is one that is stable or improving compared with your own baseline. Population averages fall with age. In 24 hour ECG data from Umetani and colleagues, average RMSSD was 43 ms in the 20s, 31 ms in the 40s, and 22 ms in the 60s. Wearable scores use different methods, so they may sit higher or lower than these figures and still be normal for you.

Is an HRV of 30 bad?

An HRV of 30 ms is not automatically bad. For many middle-aged and older adults, an RMSSD around 30 ms is within published averages. In the 2010 Nunan review, average 5 minute RMSSD across studies of healthy adults ranged from 19 to 75 ms. What matters more is whether 30 is typical for you, which device you use, and whether you have symptoms.

What is a normal HRV for a 50 year old?

For people in their 50s, the Umetani 1998 study of 24 hour Holter recordings reported average RMSSD of 25 ms and average SDNN of 121 ms. Individual values vary widely around those averages, and fitness, sleep, and health conditions all play a role. Overnight wearable readings are measured differently, so compare your current numbers with your own past readings rather than this table.

Why does HRV decrease with age?

HRV decreases with age largely because vagal influence on the heart becomes weaker over time. That is why the beat-to-beat measures RMSSD and pNN50, which mainly reflect vagal activity, fall fastest. In Umetani's 24 hour ECG data, they dropped sharply until about the sixth decade and then leveled off. Overall variability, measured by SDNN, declined more slowly across the lifespan.

Do women have lower HRV than men?

It depends on the metric and age. In the Umetani study, women under 30 had lower time domain HRV than men, but differences faded after 30 and disappeared after 50. A 2016 meta-analysis by Koenig and Thayer found women had lower SDNN but higher high frequency power, which suggests relatively greater vagal activity. Either way, the gap is small compared with individual variation.

How do I find my baseline HRV?

Measure with the same device at the same time, ideally overnight or right after waking, for at least two to four weeks while you feel well. Then use a weekly rolling average as your baseline. Log alcohol, illness, stress, and hard workouts so you can explain dips. Our guide to what HRV means explains the metrics your device reports.

Normal HRV by Age: What Counts as a Good Heart Rate Variability for You?