A good HRV depends heavily on your age, but as a general benchmark, an rMSSD between 20 and 50 milliseconds is typical for most adults. Younger people naturally have higher values, and HRV declines steadily with age. More importantly, your personal baseline matters far more than any population average, so the most useful thing you can do is track your own trends over several weeks rather than fixate on a single number.
Average HRV by Age and Sex
HRV is most commonly measured as rMSSD (root mean square of successive differences), which is the metric Apple Watch, Whoop, Oura, and most consumer wearables report. The median values below represent the 50th percentile for each group, meaning half the population scores above and half below.
- Ages 18–24: Median rMSSD of 46 ms (men) and 48 ms (women)
- Ages 25–34: 41 ms (men), 43 ms (women)
- Ages 35–44: 34 ms (men), 36 ms (women)
- Ages 45–54: 28 ms (men), 30 ms (women)
- Ages 55–64: 24 ms (men), 25 ms (women)
- Ages 65–74: 22 ms (men), 23 ms (women)
- Ages 75+: 20 ms (men and women)
The range within each age group is wide. A 25-year-old man at the 10th percentile might score 24 ms, while someone at the 90th percentile in the same group could hit 77 ms. Women tend to have slightly higher median HRV in younger age groups, with the gap narrowing after 65. This spread is exactly why comparing your number to a friend’s is not particularly useful.
What HRV Actually Measures
Your heart doesn’t beat like a metronome. The time between each heartbeat varies slightly, and HRV captures that variation. A higher number means more variation between beats, which reflects a nervous system that can flexibly shift between “rest and digest” mode and “fight or flight” mode. A lower number means your heartbeats are more uniform, which often signals that one branch of your nervous system is dominating, typically the stress-response side.
The primary driver of beat-to-beat variation is your vagus nerve, which connects your brain to your heart and controls the “rest and digest” response. When vagus nerve activity is strong, it releases a chemical messenger at the heart’s pacemaker that slows heart rate during each exhale and releases slightly during each inhale. That push and pull creates the variability. When stress hormones take over, the heart locks into a faster, steadier rhythm, and HRV drops.
This is why rMSSD, the metric your wearable likely shows, is considered a window into your recovery state. It primarily reflects parasympathetic (rest and recovery) nervous system activity, making it sensitive to acute changes in stress, sleep quality, and physical readiness.
Why Your Personal Trend Matters Most
There is no universal threshold that separates “good” from “bad” HRV for healthy people. One person’s normal could be completely abnormal for someone else. Two healthy 30-year-olds of the same sex could have resting HRV values that differ by 40 or 50 ms and both be perfectly fine.
What is genuinely useful is your own rolling average. Consistently wearing a tracker for a few weeks establishes your personal baseline. Once you have that, a drop of 10 to 15 ms or more below your average on a given morning tells you something meaningful: you may be under-recovered, fighting off an illness, or accumulating stress. A gradual upward trend over months often reflects improving fitness and recovery capacity. That relative signal is far more actionable than any single reading compared to a chart.
When Low HRV Signals a Health Problem
Chronically low HRV is associated with real health risks. A large population study called ARIC, published in Circulation, found that people in the lowest third of HRV had roughly twice the risk of dying from cardiovascular disease compared to those in the middle range. Their risk of dying from any cause was about 50% higher. These associations held even after accounting for traditional risk factors like blood pressure, cholesterol, and diabetes.
The European Society of Cardiology has proposed clinical thresholds for concern: an SDNN (a related but different HRV metric typically measured over 24 hours) below 50 ms is considered severely depressed, while below 100 ms is moderately reduced. For short-term readings like those from wearables, an rMSSD consistently below 15 ms may suggest the parasympathetic nervous system is significantly underperforming. These thresholds vary by age, sex, and recording conditions, so they’re guidelines rather than hard cutoffs.
It is worth noting that there are no formally standardized clinical thresholds for HRV yet. A 2025 review in Frontiers in Cardiovascular Medicine emphasized that differences in how HRV is recorded, analyzed, and interpreted across studies remain a core barrier to using it as a diagnostic tool. Your wearable’s HRV number is a useful wellness signal, not a medical diagnosis.
What Tanks Your HRV
Alcohol is one of the most reliable HRV suppressors. A large study of Finnish employees found that moderate drinking reduced physiological recovery during the first three hours of sleep by about 24 percentage points. Heavy drinking cut it by nearly 40 percentage points. For a person weighing about 175 pounds, five drinks meant roughly 45 fewer minutes of recovery during early sleep compared to a sober night. If you’ve ever noticed your wearable giving you a terrible recovery score after drinking, this is the mechanism behind it.
Poor sleep has a compounding effect. When you don’t sleep enough or your sleep is fragmented, the parasympathetic nervous system doesn’t get its nightly window to dominate, and your morning HRV reflects that. Chronic psychological stress works similarly, keeping stress hormones elevated and suppressing the vagal activity that drives HRV upward.
For athletes specifically, overtraining drives HRV down in a pattern that often precedes other symptoms like persistent fatigue, mood changes, and performance decline. A suppressed morning HRV that doesn’t bounce back after a rest day or two can be an early warning sign. Research suggests that autonomic balance can be restored after about a week of genuine rest in overtrained individuals.
How to Improve Your HRV
Aerobic exercise is the single most effective long-term HRV booster. Regular jogging, swimming, cycling, or similar activities strengthen the cardiovascular system and promote better balance between the stress and recovery branches of the nervous system. The key is consistency without overtraining. If your HRV is dropping week over week despite regular training, you’re likely pushing too hard and need more recovery days.
Controlled breathing exercises have a direct, measurable effect on vagal tone. Box breathing, where you inhale for four counts, hold for four, exhale for four, and hold for four, is a simple technique that activates the parasympathetic nervous system in real time. Regular meditation and yoga work through similar pathways. These aren’t just relaxation techniques; they train the nervous system to shift into recovery mode more effectively.
Sleep consistency matters as much as sleep duration. Going to bed and waking up at roughly the same time each day helps your autonomic nervous system establish predictable patterns. Limiting screen exposure before bed and keeping your bedroom cool and dark support deeper sleep stages, which is when parasympathetic activity peaks.
Hydration and nutrition play supporting roles. Dehydration increases heart rate and reduces variability. A diet built around fruits, vegetables, whole grains, lean proteins, and healthy fats provides the micronutrients your cardiovascular system needs to function well. None of these are quick fixes. HRV improvements from lifestyle changes typically emerge over weeks to months, which is another reason consistent tracking is so valuable: it lets you see whether what you’re doing is actually working.