Despite the incredible benefits and advantages of the modern world, many of us find ourselves under considerable stress and anxiety.

When we’re stressed the body engages in a specific set of behaviours. The heart speeds up, pupils dilate, digestion halts, muscles tense.

These behaviours can help in certain stressful situations, especially short-live situations, but when they’re prolonged or in response to something that’s not truly threatening, they create more problems than solutions.

According to the American Institute of Stress, 77% of people say they experience physical symptoms caused by stress, and almost half say stress has a negative impact on their lives.

It is no wonder why people are turning to stress management techniques such as meditation. We need better ways to manage the stressors in modern life, but now modern technology is partnering with us to achieve this goal.

Before we look at what this technology is, it’s best to understand what’s happening in your body when you stress out.

The Nervous System

The body’s nervous system is divided into the central and peripheral systems. The central nervous system (CNS) is your brain and spinal cord, while the peripheral nervous system (PNS) consists of the nerves running throughout your body.

Two important systems within the PNS include the sympathetic and parasympathetic nervous systems. Together both systems maintain an intricate balance.

The sympathetic nervous system kicks into gear when we’re stressed. It’s responsible for the fight-or-flight response. The parasympathetic nervous system works in the opposite direction, when we need to rest-and-digest.

When one is active, the other is suppressed, and your body engages in vastly different functions depending on which system is currently active. Here’s a broad overview:

While most of the activity in these two systems happens automatically, there are things you can do to help push your body towards one or the other—and the big one here is breathing exercises, which can help you get your parasympathetic system rolling.

HRV Training

By taking control of your breathing, you can gain indirect control over your heart rate. The age-old advice to take a deep breath when you feel overwhelmed has plenty of science behind it.

This alone is enough to help you take more control of your body and mind, but there is more to breathing exercises than simply relaxing—the right exercises can improve your ability to handle stress, even when you’re not doing the exercises.

When you breathe in, your heart speeds up slightly. When you breathe out, the reverse happens. This means the time between your heartbeats is constantly changing, not monotonous like is often thought.

The difference between those durations when you’re inhaling or exhaling represents your heart rate variability (HRV), and it’s considered a marker of self-regulation.

Patrick Whitehead writes, “At maximum HRV, your heart rate will be at its highest at the peak of the in-breath, and the lowest at the peak of the out-breath. This is known as heart rhythm coherence, and it is the goal of HRV biofeedback.”

HRV biofeedback training can make our hearts more responsive and resilient to the stressors we face in life, and can make us more aware of those responses when they occur.

But first, we need to know how to see and make sense of the signals, and this is where HRV biofeedback devices come in.

The Best HRV Biofeedback Devices

We get feedback from our body all the time—when we’re hungry, tired, sad or upset, in pain, when we shiver or sweat, or get goosebumps. The body is responding to something in a very specific way.

We can get feedback from our hearts, and we don’t need a device. You can put your hand on your neck, or go for an intense run to the point you can feel it beating in your chest.

However, a device can offer us a more accurate recording and a more comprehensive analysis. They can measure activity when we’re thinking about something else and alert us to anything that would have fallen below our level of awareness.

Getting this type of HRV biofeedback training used to be very expensive and required heavy equipment, now it’s affordable and can be strapped conveniently to your body.

Below are the best devices on the market today, with enough variability to suit most people’s desires and constraints.

1. HeartMath Inner Balance

Inner Balance HRVThe Inner Balance attaches to your ear, but rather than a standalone device with a built-in display, Inner Balance connects to your phone or tablet via Bluetooth (there is also a wired Lightning version that connects via cable).

This makes it more comfortable and inconspicuous, and is better for those moving around and not wanting to carry much extra weight. It also means you can see more real-time data on your phone.

When you open the app, you’ll be presented with a coloured wheel that slowly expands and contracts, your job is to keep your breathing in time with it. The goal is to get the outer circle green to represent better resonance, with blue suggesting there’s still room for improvement and red meaning you’re further off.

Inner Balance is more affordable than the EmWave 2 at $160. One downside is that it requires an Apple or Android device, though that is unlikely to trouble most people these days.

2. HeartMath EmWave 2

HeartMath EmWave2Like the Inner Balance, the EmWave 2 attaches

The HeartMath Institute is a non-profit that’s been around since the 1990s, researching how heart function influences brain function. They have several HRV biofeedback devices available, two of which we’ll explore here.

The EmWave 2 comes with a clip that you attach to your ear lobe, which records your heart rate. A cable connects that to a matchbox-size device with lights that reflect your heart rate and suggests the speed you should be breathing.

All you need to engage in the exercises is this device and clip. But for the more comprehensive analyses and tracking information you’ll need to connect the device to your computer to use their accompanying software.

The EmWave 2 is in the middle of the pack in terms of prices at $199.

3. Unyte iom2

Unyte iom2The iom2 comes in three parts: a sensor that clips onto your ear, which sends data via cable to a phone-sized device, which pairs via Bluetooth or USB to a program on your computer, tablet, or smartphone.

Using the software, you can start up one of Unyte’s 8 journeys, immersive and interactive meditations that engage you in different breathing exercises. You can find demos of them here.

As you go through these meditations the device will monitor your HRV and give you a real-time resonance score. Your HRV should improve as you progress, so you have a positive summary of the results at the end of the meditation, and over the longer time frame.

Pricing for Unyte’s iom2 comes in two subscription models: for $200 you get the device and a one-year subscription to the software and meditations ($60 per year thereafter), or for $350 you get the device and a lifetime subscription.

 

4. Apollo Neuro

Apollo NeuroThe Apollo Neuro was launched in 2020, and given the stressful situation the world has been placed in, the timing worked in their favour—the devices flew off the shelves and sold out in two weeks.

What you’ll get if you buy the Apollo Neuro is a device that straps to your wrist or ankle and a smartphone app. The device has a few controls on the side so you won’t need your phone for everything.

The Apollo Neuro is more about HRV training than biofeedback. Rather, the device is designed to produce low-frequency inaudible sound waves, and these gentle vibrations act on your nerves to alter how you feel.

Using the app you can choose from 7 modes for these vibrations, such as ‘Energy and Wake Up,’ ‘Clear and Focused,’ and ‘Meditation and Mindfulness.’ After selecting the mode you can also adjust the intensity and define for how long it should run.

While it may lack biofeedback, it is capable of improving your HRV. Their research has found a 25% improvement in cognitive performance, a 2 – 3 times improvement in HRV, and 40 – 50% reductions in stress and anxiety.

Of the downsides, the price is on the higher end of the spectrum at $349. Some have also complained about the battery life. The fact it doesn’t record any data also means there’s not much analysis of your HRV, so it’s difficult to see how well it’s working.

 

5. EliteHRV CorSense

EliteHRV CorSenseCorSense consists of a finger sensor that uses photoplethysmography (PPG) to record your heart rate. The sensor connects via Bluetooth to your smartphone, where you’ll see all the analytics and live feedback.

Part of the bio-feedback that the CorSense provides is something called a ‘daily morning readiness score.’ This is a short 1 – 5 minute reading taken first thing in the morning.

This is ideal because throughout the day there are many stressors that impact our heart rates, making it difficult to know what your personal baseline is, first thing after you wake up is the best time to figure it out.

A price tag of $165 makes CorSense one of the more affordable HRV biofeedback devices. The app has a free version, a Personal Pro option for $8 per month which includes a web dashboard and advanced analytics, and a Team Pro option for $30 if there’s more than one of you.

 

6. Somatic Vision’s Alive

Somatic Vision's AliveSomatic Vision’s Alive is a slightly different addition to this list in that it is only the software, which is designed to be used with the EmWave 2 sensor mentioned above.

It’s software that provides a unique visual experience for your training. You use your breathing to explore different environments or play games such as building a house, transitioning through the four seasons, and helping an alien dock at the mothership.

If those environments and games that come included just aren’t quite enough, there are many potential additions.

For example, the Dreamscapes add-on includes 12 high-quality environments; brain games like jigsaws, Sudoku, crosswords, and chess; and creativity games including building blocks and designing music.

Another add-on provides you with a large selection of arcade games, including Candy Crush, all designed to be played with your breathing and heart rate.

You can get both Alive and the EmWave 2 sensor for $295. If you already have the sensor then Alive by itself costs $149. However, the add-ons are rather expensive, with the Arcade games coming in at an additional $295 and the Dreamscapes $299.

 

7. Lief

LiefThe Lief system consists of ECG (electrocardiogram) adhesive stickers you attach to your body, which gather data and send it to the main Lief device, and from there to the Bluetooth connected Lief mobile app.

The adhesive stickers mean Lief can hide inconspicuously under your clothing, it’s comfortable and can be used while moving about. There’s also an optional athletic strap to keep them firmly in place if you want to exercise and work up a sweat.

Another great thing about Lief is it doesn’t require constant monitoring of your phone. It’s designed to be worn for hours each day (8+ by their recommendations), which makes device monitoring unfeasible.

Instead, Lief will alert you by vibration when your HRV dips below a target range. At that point, you begin breathing in time with the vibrations while the device continues to monitor your HRV.

Once your HRV rises back above the threshold, the vibrations end and you continue your day in a better state.

They are also the first to offer personal HRV coaches to help you better understand and evaluate your data. You talk with this coach several times per week over an eight week period, to set goals and get advice and feedback.

While at one point you could buy the device, they now only offer subscriptions in which you rent it for $99 per month with the coach, or you can go it alone for $49 per month.

One downside to adhesive stickers is that they last between 2 – 5 days before needing to be replaced. A pack of refills is included when you purchase it, but when you need a new pack you can get 15 for $19.99. The hassle might be enough to put some people off.

Something for Everyone

Each of these biofeedback devices is quite unique, meaning anybody should be able to engage in HRV training while taking into account your personal constraints and requirements.

For those interested in a device they can use on the go and that doesn’t require their constant attention, Lief’s adhesive stickers or Apollo Neuro’s wrist strap will be the most comfortable.

Anybody wanting to sit still in a calming digital environment will be pleased with iom2’s meditative journeys or the HeartMath EmWave 2 sensor coupled with Somatic Vision’s Alive and its vast array of games.

For those that want a no-nonsense look into their HRV and other relevant data, HeartMath’s products and CorSense will enlighten you. 

When it comes to costs, here’s a quick comparison:

Given the prevalence of heart-related health problems facing so many of us today, taking some measures to strengthen that all-important organ is highly recommended.

These devices each have something to offer in that way, whether it’s simply by recording data or by taking you through interactive environments and training games.

But it’s also important to remember that you can engage in HRV biofeedback training yourself, without any device. You won’t get as accurate feedback, but you will still see health-related gains.

Just breathing slowly and consciously, or sitting down for a little meditation, while paying close attention to what you feel and your state of mind, are great ways to get your brain and heart inline. 

Perhaps the greatest advantage the devices offer is that they should help you become more aware of the signals your body naturally sends.

After some time you may begin to notice the signs you would otherwise miss, and you will know how to interpret them and what to do about them. This isn’t just about training your heart and HRV, it’s also about learning how to respond to the stressors in life.