How do you raise your HRV?

Finish hard workouts and dinner a few hours before bed, drink less and earlier, and get enough sleep. Those move tonight’s number. Steady exercise over months raises your usual range. Supplements, saunas and gadgets have little or no evidence.

Most advice lists a dozen tips with no sizes. Here they’re in order of how much they moved HRV in studies, with the ones that work tonight first.

Why isn’t my HRV going up?

People often try the wrong things for the wrong length of time. They add a supplement, a cold plunge or a breathing app and check the next morning. Or they start running and expect a higher number within a week.

The levers work on two clocks. Some act on the same night: what you drank, when you trained hard, when you ate and how long you slept. Others act over months: fitness, mostly. Mixing them up makes it look like nothing works. A third group, the gadgets and supplements, mostly hasn’t been shown to work on either clock.

A simple way to picture it

Think of a garden. Whether the soil is wet tomorrow depends on whether it rained tonight. How green the garden is in summer depends on months of care.

Tonight’s HRV is the wet soil: drinks, a late session and a late meal decide it. Your usual range is the summer garden: it grows with months of exercise and doesn’t care much about any one night.

What raises HRV, ranked by size?

The sizes come from different kinds of study, so they don’t add up and the ranks are rough. The first two are from millions of nights of WHOOP data, compared within each person. The last four are from smaller trials.

Why do late workouts lower HRV?

Exercise speeds the heart and takes the brake off, and the body takes hours to settle back. If you go to bed before it has, the first part of the night starts with less brake.

The best data comes from 14,689 WHOOP members over a year, about 4 million nights. Every level of exercise came with slightly lower HRV that night than a rest day. The effect grew the later and harder the workout was. Workouts that ended 4 or more hours before sleep weren’t linked to worse sleep at any intensity, though HRV still ran a little lower after hard days.

So you don’t need to stop training hard. Move the hard sessions earlier, or keep evening sessions easy.

Why do drinks lower HRV?

Alcohol raises the heart rate during sleep and takes the brake off. In 4,098 Finnish employees measured in the first 3 hours of sleep on nights with and without drinks, an HRV-based measure of recovery fell by 9.3, 24.0 and 39.2 percentage points after low, moderate and high amounts. Even the low amount moved it.

The WHOOP study of 20,968 members found the same pattern and added timing. Drinking an hour earlier than usual, against an hour later, came with HRV about 1.5 ms higher in women, and longer sleep after drinking softened the effect. The effects were larger in women than men and in younger than older people.

Both studies had authors from device makers, WHOOP in one and Firstbeat in the other, and both relied on people logging their own drinks. But each compared people with themselves on nights with and without drinks, the dose pattern was the same in both, and together they cover millions of nights, which is why we call it strong.

Does exercise raise HRV over time?

Yes, slowly. A 2024 review of 16 randomized trials in 623 healthy adults found training raised RMSSD and SDNN compared with no training. A 2005 review of 13 studies found the same for the breathing-linked part of HRV. A 2016 review of athletes found resting RMSSD rose when training was making them faster.

There’s a catch for athletes. The same review found resting RMSSD also rose a little in athletes who were overreaching, so a rising number alone doesn’t prove the training is going well.

The trials ran for weeks to months, and in a 2025 trial eight weeks was enough to show a change. Give exercise about two months before you judge it on your HRV, and judge the 7-day average, not a night.

Does a late dinner lower HRV?

Probably, though the trials are small. In a 2026 trial, 39 adults aged 36 to 75 with overweight spent 7.5 weeks either stopping food at least 3 hours before sleep or eating as usual. The early group had lower heart rate and higher HRV at night. In a 2025 lab study of 20 people on simulated night shifts, eating during the night cut RMSSD by 14.3 percent, and eating only in the daytime prevented it.

Digestion is work for the body, and the first hours of sleep are when most devices start counting. We’d move dinner earlier before trying anything you’d have to buy.

Does slow breathing raise HRV?

During the session, clearly. A 2022 review pooled 223 studies and found vagal HRV rose during slow breathing, right after a session, and after a course of sessions. In 90 people wearing Garmin watches, a logged meditation session came with higher RMSSD for at least 30 minutes.

At rest, it’s unclear. In a 2026 trial of 88 adults, four weeks of slow-breathing practice lowered stress, anxiety and low mood but didn’t change resting HRV.

So do it if it helps you feel calmer or fall asleep. Don’t record a breathing session as your resting number, because it will make your morning check look better than your night.

What doesn’t raise it?

• Sauna. In a 2025 trial, 38 sedentary adults did eight weeks of exercise with or without a 15-minute sauna afterward. Exercise improved HRV. Adding the sauna added nothing.
• Supplements. Magnesium has been tested on HRV in people with heart failure, and in rats, but we haven’t found a trial showing any supplement raises overnight HRV in healthy people.
• Gadgets and hacks from our old guide. Gyroscope’s first HRV guide listed mouth tape, an eye mask, a colder room, a walk after meals, breathwork and sauna as ways to raise HRV. Apart from breathwork and sauna, covered above, we haven’t found trials that measured their effect on overnight HRV, so they’re off this list. Some may help you sleep, which is a good reason on its own.

What you can’t change, and shouldn’t try to

HRV falls with age: in one study, RMSSD in the 50s was 47 percent of its value in the teens. It swings with the menstrual cycle and falls in pregnancy. These aren’t problems to fix, and chasing a younger person’s number is a race you can’t win.

Aim for a steady band, fewer nights knocked down by things you chose, and a range that drifts up as you get fitter. The highest possible number is the wrong target. A WHOOP study of 2 million nights found that nights swung more from week to week in people who drank more, moved less and slept shorter or less regular hours.

How to test a change on yourself

1. Build your normal range first: two to three weeks of nights on one device. Our normal range calculator works it out.
2. Change one thing, such as moving hard sessions to the morning or cutting evening drinks.
3. Keep it up for two weeks and compare the 7-day averages before and after.
4. A single good night proves nothing. Two weeks that both sit higher are worth keeping.

For drinks, the drinks and your HRV calculator shows the change the WHOOP study found for your number and timing.