Yes, on average. In the Atherosclerosis Risk in Communities study, 11,061 adults aged 45 to 54 had their heart rate variability (HRV) measured from a short ECG ECG A recording of the heart's electrical activity, taken with electrodes on the skin. ECG-based RR intervals are the reference standard for measuring HRV. More about ECG . People with hypertension had lower HRV at the start, across the whole range of blood pressure, and among the 7,099 who did not have hypertension, those in the lowest quarter for RMSSD RMSSD Root mean square of successive differences: an HRV metric built from how much each heartbeat interval differs from the next, in milliseconds. It mainly reflects vagal activity. More about RMSSD had 1.36 times the hazard of developing it over the next nine years (Schroeder and colleagues, 2003). That is a link across a large group. Your HRV cannot measure your blood pressure, and the drugs that treat it move the number in their own ways.
What the ARIC study found
The researchers wanted to know which comes first. Three things stood out:
- Lower HRV in hypertension. People already diagnosed had lower HRV than those without, and the pattern held at every level of blood pressure, not just above the diagnostic line.
- Low HRV before hypertension. Among people without hypertension at the start, lower HRV predicted a greater chance of developing it over nine years. The hazard ratios for the lowest against the highest quarter were 1.24 for SDNN SDNN The standard deviation of all NN intervals in a recording, in milliseconds. It measures overall variability, and its value depends strongly on how long the recording lasts. More about SDNN , 1.36 for RMSSD and 1.44 for the beat interval itself (a faster resting heart).
- No widening gap. Over the nine years, HRV fell at the same rate in people with and without hypertension, so the difference between the groups did not grow.
The authors read this as support for the nervous system playing a part in how hypertension develops, with the autonomic difference present early rather than growing later. A 2024 review of the factors that shape HRV lists hypertension among the conditions linked with lower values (Sammito and colleagues, 2024).
Why the two go together
Blood pressure is kept steady by a reflex: pressure sensors in the big arteries tell the brainstem to slow the heart and relax the vessels when pressure rises, and the reverse when it falls. Much of the beat-to-beat variation that HRV measures comes from that reflex and from the vagal brake it uses. When the sympathetic Sympathetic nervous system The "fight or flight" branch of the autonomic nervous system. It speeds up the heart and makes it pump harder, but it acts too slowly to drive beat-to-beat HRV. More about Sympathetic nervous system branch runs higher for years, both blood pressure and the stiffness of the arteries tend to rise, and the vagal share of control shrinks. Lower HRV and higher pressure are two views of the same shift.
What blood pressure drugs do to HRV
A 2025 review gathered 29 randomised trials, with 2,230 people, of blood pressure treatments and HRV (Sehgal and colleagues, 2025):
| Drug group | Effect on HRV in trials |
|---|---|
| Beta-blockers | Consistently raised HRV and vagal measures |
| Non-dihydropyridine calcium channel blockers (verapamil, diltiazem) | Raised HRV |
| Angiotensin receptor blockers | Raised HRV in people who also had metabolic syndrome |
| Alpha-blockers | Small gains |
| ACE inhibitors, thiazide diuretics | Little effect |
The trials varied a lot and were not graded for quality, so these are broad patterns. A higher HRV on a beta-blocker reflects the drug slowing the heart, not a fitter heart. The page on medications and HRV covers other drug groups.
How to read your own data
- Measure blood pressure directly. If you want to know it, use a validated arm cuff at home, seated and rested, on several days. HRV is not a substitute.
- Tag medicine changes. When a doctor starts or changes a blood pressure drug, note the date and compare from that point on. A month before and a month after are not like for like.
- Use the levers that help both. Regular aerobic exercise and losing extra weight tend to raise HRV and lower blood pressure. See how to increase HRV.
- Keep the long-term link in perspective. Lower HRV goes with higher risk across groups, as the longevity page explains, but it is not a forecast for you.
When to talk to a doctor
Never stop, start or change a blood pressure medicine because of your HRV. Talk to a doctor if home readings are often 140/90 or above, or if you have headaches, blurred vision, chest pain, breathlessness or nosebleeds with high readings. Get urgent help for a reading of 180/120 or more with symptoms. HRV cannot diagnose anything, and this page is not medical advice.