Best Triathlon Heart Rate Monitor

Heart rate monitors (HRM) provide valuable data that can help improve performance and maximize the benefits of training. By tracking your heart rate, you can gauge your training and search for cues from your body that point to the effectiveness of a particular exercise program.

See more: Best Triathlon Watch – Buyer’s​ ​Guide

There are many of heart rate monitors in the market today, which one will you buy? We help you find the best heart rate monitor for triathlon, swimming, cycling and running.

Best Heart Rate Monitors in 2023

1. Garmin HRM-Pro Plus Heart Rate Monitor

The Garmin heart rate monitor HRM-Pro Plus is an updated version of the already quite capable HRM Pro. The HRM-Pro Plus, it builds upon the original with all those same capabilities, like being a really the reliable heart rate monitor, the ability to collect advanced running dynamics, including running power, and the ability to record and store offline heart rate data for activities like swimming. You can also collect steps, intensity, minutes and calories without you even needing to wear a watch at all.

The most important addition to the HRM-Pro Plus is its ability to provide pace and distance while running indoors. This allows for more accurate pace and distance measurements than can be achieved with a watch alone while running inside.

The original Garmin HRM Pro was already one of my favorite heart rate monitors, and the redesign makes it even better. It’s now much easier to replace the batteries, which is great because you don’t need any tools. The battery cover on the Garmin HRM-Pro Plus is now easier to access. Just turn it counterclockwise and you’ll have easy access to the battery. This makes it easier to replace the battery, and also reduces the chances of it becoming damaged.

The Garmin HRM-Pro Plus is a great heart rate monitor. It is just as accurate as the original, and it was spot on for everything that I threw at it, from running to road biking to mountain biking, strength training, as well as swimming. The battery life is also fantastic, lasting up to twelve months.

The original HRM Pro as well as the HRM-Pro Plus are much more than just external heart rate monitors. When you pair it with a compatible Garmin watch, they provide advanced running dynamics, including running power, as well as other metrics like vertical oscillation, ground contact time and ground contact balance. These additional data points can help you assess your running form as well as your running efficiency.

The Garmin HRM-Pro Plus is a great device for running and other activities. It can collect accurate heart rate data for a variety of activities, and it pairs well with both Garmin and other devices that have Bluetooth or Ant+ capabilities. This makes it a great option for indoor training platforms like Zwift.

The Garmin HRM-Pro Plus is a great option for those looking for a heart rate monitor that can store data. This is especially useful for swimming, as wireless signals don’t transmit well through water. The Pro Plus can record heart rate data on the strap itself, so you will have it available even when you’re not able to pair your watch with an external monitor.

So that’s where you need an external heart rate monitor that can store heart rate data if you want that accurate heart rate data for your entire swim session. And then what happens is that when you go to save your activity on a compatible Garmin device, it will actually download that heart rate data from the Strap and kind of merge that with your swim data, like the lapse distance and so forth. But what is kind of cool about the HRM-Pro Plus is that during rest periods, in between intervals, if your watch and the Strap are both above water so they can properly communicate with each other, you will be able to see your heart rate in real time at that moment. And you also will be able to see your average heart rate for the last interval. Now, there are a couple of things to note about swimming with the HRM-Pro Plus or the original HRM Pro.

One thing to note about swimming with the HRM-Pro Plus or the original HRM Pro is that during rest periods, if your watch and the strap are both above water, you’ll be able to see your heart rate in real time. You’ll also be able to see your average heart rate for the last interval.

The Garmin HRM-Pro Plus is a best heart rate monitor for triathletes and other endurance athletes. It can collect accurate heart rate data for a variety of activities, and it pairs well with both Garmin and other devices that have Bluetooth or Ant+ capabilities. This makes it a great option for indoor training platforms like Zwift. The Pro Plus can also store data, which is especially useful for swimming.

2. Garmin HRM-Pro Heart Rate Monitor

HRM-Pro chest heart rate strap from Garmin, which is Garmin’s most advanced heart rate strap to date. The HRM-Pro collects accurate heart rate for activities like running and cycling, but it also can collect heart rate in the water for swimming. But beyond just heart rate, it can also collect advanced running dynamics, including running power, when paired with a compatible device, like the Garmin Forerunner 945.

The HRM-Pro also has ANT+ as well as Bluetooth connectivity so you’ll be able to pair the HRM-Pro up with an online cycling training platform like Zwift, if you’re using an Apple TV or an iPad. With ANT+ and Bluetooth, you’ll be able to pair it with an unlimited amount of connections. Bluetooth has a dual connection.

The Garmin HRM-Pro can actually store your heart rate, steps, and intensity minutes on the strap itself, and then it can actually sync up with Garmin Connect on your phone.

It’s actually a very similar process for swimming heart rates. Swim capable heart rate straps, like the HRM-Pro, the HRM-Swim, and the HRM-Tri store the heart rate data on the strap itself, and after the session is done, another device will actually download that data. The reason for this is that ANT+, as well as Bluetooth, don’t really transmit through the water all that well.
The Garmin HRM-Pro has about 18 hours of internal storage.

You can swim with the HRM-Pro in both fresh, as well as saltwater for open water swimming. And it is also designed for occasional pool swimming. The material that the HRM-Pro is made out of, doesn’t have the resistance of pool chemicals like the HRM-Swim, which is actually designed for consistent pool swimming since it’s made of more robust materials.

However, the other reason that you may want to go with an HRM-Swim specifically for pool swimming is that the HRM-Swim does have a wider strap that has these super grippy bits on it. The strap on the HRM-Pro is going to be a little bit narrower than the HRM-Swim, so it could potentially flip, especially when you’re pushing off the wall when there’s a lot of force.

The HRM-Pro not only collects heart rate, but it also collects advanced running dynamics and these are going to be the same that you’re going to be found on the HRM-Run as well as the HRM-Tri. But just note that the advanced running dynamics, these are only going to be available over ANT+ and not Bluetooth. Garmin watches already can collect basic running dynamics, like cadence and stride length, on the wrist itself. But when you pair up and use the HRM-Pro, you’ll get a lot more, including your vertical ratio, vertical oscillation, ground contact time balance, ground contact time, as well as running power.

The HRM-Pro is rated to last up to a year and it uses a CR2032 battery that’s used on a lot of devices out there. You’ll replace the battery by removing the little rubber gasket and then using a small screwdriver to remove the cover inside.

Garmin has a lot of different heart rate straps to choose from, but if you can spring for it, the HRM-Pro, I think it’s well worth the money just because it is going to be a very capable device and it’s going to be Garmin’s most advanced heart rate strap to date.

3. Polar H10 Heart Rate Monitor

The Polar H10 is designed to be one of the best heart rate monitors that provide accurate results. It allows you to connect to your heart rate training equipment while enjoying the full benefits of your heart rate training. It comes with enhanced electrodes that make the device the most precise heart rate sensor in Polar Company.

This HRM is suitable for swimming because it is waterproof and can transfer your heart rate data even when you are underwater with 5 kHz transmission. In case you don’t own a Polar watch that is compatible with the device, you can still use this Polar H10 to track your heart rate while in water because you can transfer the data to the free Polar Beat app later.

For easy transfer of data, this Polar H10 is compatible with iOS mobile devices, iPhone 4S, and Android mobile devices with Bluetooth 4.0 capability.

It features a Polar Pro strap that is made from a soft textile strap with enhanced electrodes. This ensures that it will take your heart rate’s data accurately without interference. What’s more, the strap is very comfortable to wear around your chest while the silicone dots and an enhanced buckle keep the strap and the HRM firmly held.

It comes with an enhanced battery life that allows you to enjoy over 400 hours of operation time on a user replaceable battery. The HRM can store up to one heart rate training session. As such, we highly recommend it for perfect sports and activities where the wrist unit could be difficult to use.

4. Wahoo TICKR X Heart Rate Monitor

Back in 2014 Wahoo were one of the first to launch a dual band ANT+ and Bluetooth heart rate strap. It’s pretty much compatible with anything smartwatches or phones that you can connect to.

What’s changed with Wahoo TICKR Generation 2?
It looks very similar to the older version. On the back, the strap integrates a lot smoother or a lot flatter with the pod itself. When you’re clipping it and pressing it to your body, it should be more comfortable. I ussually never had any problems with heart rate straps, but for a few people, that’s going to be a welcome change.

The LED status lights are on the top of the heart rate monitor rather than the front. When you’re clipping your heart rate monitor in, if you’re looking at the status lights, you no longer have to flip it up to see the status of the unit.
There’s ANT+ and three Bluetooth connections to the TICKR and TICKR X.
Why three? It solves a problem for Wahoo and their own ecosystem. If you had a KICKR headwind, a training app such as Zwift or TrainerRoad, and you’re running a head unit all at the same time, you can connect to Bluetooth to your heart rate strap.

The memory has been improved from 16 hours up to 50 hours. It will record some running metrics. If you’re using that unit for a run, it will record some additional running metrics which can be viewed via the Wahoo app. And for indoor cycling, it will give you an estimated cadence with the accelerometers. If you’re using an Apple TV, you’re limited to those two device connections. And if you’re using an older trainer that doesn’t have cadence, you only have the option to connect direct via a heart rate strap or a cadence sensor. The TICKR X can act as a heart rate monitor and a cadence sensor.

Battery life quoted TICKR is up to 500 hours and the TICKR X with the accelerometers is working a little harder all the time it’s in use, so over 200 hours for that. A few things of note, the TICKR run is gone and the TICKR Fit optical strap is still there for those who don’t like straps.

If you are looking for a versatile HRM to keep track of your workout in all your sporting activities, then we recommend this TICKR X from Wahoo Fitness.

5. Garmin HRM-Swim Heart Rate Monitor

The Garmin HRM-Swim is best known for offering the best heart rate tracking for swimmers as well as other water sporting activities such as surfing, shallow snorkeling, among other shallow water activities.

When you are training in water, you do not have to stop gathering your heart rate data. This is because Garmin HRM is specially designed for water sports where it boasts of a water rating of up to 5 ATM. This implies that it can withstand the forces of up to 50 meters when underwater, which makes it a perfect choice for swimmers and other water sports activities. [yellow]

This HRM effectively runs on a standard CR2032 battery that is readily available in case you need a replacement. Nonetheless, it comes with a battery life of up to 8 months if you are swimming an average of 3 hours a week.

Its design also makes it easy to transmit heart rate data that is stored in the non-slip straps wireless Garmin Forerunner, Fenix series and other ANT+ compatible devices. Moreover, the straps are effective at registering every pulse.

One major problem with the HRM device, however, is that it is not waterproof; it is only water resistant. This means that it is not ideal for you if you participate in deep-sea sports activities. [red]

If you want a HRM to keep track of your heart rate as you train for shallow water activities like snorkeling and surfing, then we recommend this device.

6. Scosche Rhythm24

Owning your personal heart rate monitor allows you to maximize your workout while training. This Scosche Rhythm 24 comes with advanced optical sensors that allow you to take precise heart rate readings so that you can maintain your zone while receiving the optimum benefits from your workout.

It is both sweat proof and waterproof, which means that you can still have accurate readings and performance in dry and wet conditions. Moreover, it allows you to dive 10 feet under the water without having to endure any deterioration of performance.

It features green and yellow optical sensors that offer superior measurements with any skin tone. This feature makes it stand out among the many HRMs and watches that utilize the green sensors only.

Rhythm 24 has the capability of recording on-board, which allows you to leave your smartphone behind while your HRM records your workout heart rate data for later uploading to your device.

What’s more, you can customize this HRM easily by changing the HR zones and modes via the Rhythm Sync app. The available modes include the heart rate variability, swimming, and cadence, among others.

Despite being great at collecting data, you might experience issues when you try to use the software app. This is because you might have trouble transferring your work out data.

It also features an extended use rechargeable battery that allows you to workout up to 24 hours non-stop. The LED battery level indicator also gives you the status of your battery charge by a push of a button.

If you want a device to use to track your long day at the workout, therefore, we recommend Rhythm 24 HRM.

Heart Rate Monitor for Triathlon — Buyer’s Guide

Before purchasing a heart rate monitor, it’s important to understand the science behind heart rate and blood flow. This will help in understanding what the different measurements mean.

First, a quick lesson: the amount of times the heart beats per minute is called the heart rate. Exercise makes the heart stronger, enabling it to pump more blood throughout the body per beat. Oxygen from the lungs is delivered to muscles through the bloodstream. The heart beat increases during exercise in order to supply the muscles with the additional oxygen they need. There are a few different numbers that come into play with the heart rate.

Resting Heart Rate

This is the number of beats per minute while at rest. Resting heart rate (RHR) should be measured when you first wake up or when you’re sitting and relaxed. The average RHR for a man ranges from 60 to 80 beats per minute, and the average for women is between 70 and 90 beats per minute. Some extremely conditioned athletes can have a RHR below 50 beats per minute. To find your RHR: use a heart rate monitor to track your RHR at different points throughout a week. Take the average of these numbers to get the most accurate measurement of your RHR.

Maximum Heart Rate

When exercising as hard as you can, you’ll approach your maximum heart rate (MHR). To get the most accurate measurement of your MHR you would need to use an electrocardiogram, which would require visiting a fitness specialist or doctor. Because most people don’t have access to this type of specialized test, there are a few easy calculations that will provide an estimate. One formula: simply subtract your age from 220. For example, a 40 year old would subtract 40 from 220, equaling 180 beats per minute. While not completely accurate, this calculation will provide a general idea of MHR.

Training Heart Rate

The training heart rate (THR) is the rate your heart maintains during certain types of activity, measured in percentages of your MHR. Depending on your goals and the level of exercise, this number can vary. During faster running for a long period of time, your heart rate will generally fluctuate between 70 and 80 percent of your MHR. During a slower, longer run, your heart rate will typically range from 60 to 70 percent of the MHR, and a vigorous walk between 50 and 60 percent.
Recovery Heart Rate

Immediately after a workout your heart rate drops, allowing the body the ability to recover. Your heart should quickly begin beating within 20 beats of your RHR.

By using a heart rate monitor, you can track all of these numbers throughout your training. A heart rate monitor is beneficial for ensuring you’re exercising at the proper intensity to reach your goals, whether your aim is to strengthen your heart, improve endurance, control weight, or simply stay healthy.

Type of Heart Rate Monitors

There are two types of HR monitors that you can find in the market. These are chest straps and optical heart rate sensor models. Let’s see how different they are from each other.

Chest Straps

Chest straps are worn around the chest just like the name suggests. When wearing a chest strap HRM, the sensor unit has to be at the center of where your heart is located. This makes it easy for the sensor unit to measure precise heart rate readings and transmit them to the head unit that displays for reading purpose. Chest straps heart rate monitors are best used for cycling.

Optical Heart Rate Sensors

These are wrist-based heart rate monitors that utilize green LEDs to collect heart rate. The Green LED sits underneath the HRM devices in order to make it easy to read and to get accurate readings. The LED light shines to your skin in order to measure the blood that flows through your wrist. The reflected light is what is collected by the sensor which in turn computes your heart rate instantly. Before purchasing an HRM, therefore, it is important to consider the type of HRM that will best suit your needs.

Connectivity

Basically, a heart rate monitor is just but a sensor, and it requires to relay readings to the head unit. In order to relay the heart rate readings, there are two connectivity ways that are widely used.

Ant+ is a wireless connectivity that is a production of Garmin. It is widely used in almost all types of heart rate monitors. The technology, however, has started to diminish as other connectivity protocols like Bluetooth have become popular.

Bluetooth is another wireless connectivity protocol that has undergone quite a number of refinements and innovations. For instance, the latest version is Bluetooth Low Energy that is efficient in using the power, thus making it a common addition in many heart rate monitors today. This means that before you settle for a heart rate monitor, it is important to consider the type of connectivity it uses.

Accuracy

When it comes to assessing the heart rate, getting accurate readings matters and no one wants a heart rate monitor that provides wrong readings every time he or she is training. However, a consistent and reliable HRM is a plus.

Since the Chest strap HRM is placed next to the heart, it provides the most precise heart rate readings. Sitting near the heart allows it to capture a stronger signal as compared to when located far away like on the wrists. This is why the optical heart rate monitors lag the readings since they don’t get a stronger heartbeat.

Reasons Why You Should Use a Heart Rate Monitor

Exercise Effectively: HRM allows you to exercise or train in a more effective way as compared to when you are training without it. This is because it enables you to peak at the intensity best suited for your exercise.

Exercise Safely: Monitoring your heartbeat allows you to keep it within your physical limits, especially if it goes higher. It also allows you to find the most appropriate target heart rate and strive to maintain it.

Tracking your Progress: HRM also allows you to track your training progress as well as your overall fitness. With this, you can revisit your data in order to evaluate whether you are making progress before setting new goals.

How to Use and Care for your Heart Rate Monitor

For your heart rate monitor to provide accurate and reliable readings, you will need to learn how to use it correctly. Here are some instructions on how to wear your HRM to get better readings regardless of the model you are using.

To begin with, wet the strap before you put it on. You can do this even if you are going to bike in wet conditions. Wetting the straps allows you to get reliable readings.

After wetting it, it is now time to wear it. You need to wear it correctly by placing the monitor at the center of your chest. It ought to fit comfortably and make sure that the right side of the unit is up.

Once you are done with your exercise, it is important to wash away the built-up sweat and salt that might affect the accuracy of your heart rate monitor. Before washing your monitor, however, check for instruction to ascertain if it is hand washed or machine-washed. When washing it, make sure to use a mild soap or detergent.

Finally, detach the sensor unit from the strap and allow it to dry. This is because it might corrode when left wet, especially around the metal elements of the sensor. Essentially, corrosion can stop your sensor from making accurate readings. Whenever you see a corroded area of your sensor, therefore, you need to wipe it clean with alcohol.

Conclusion

If you participate in different sporting or workout activities, then you understand why it is important that you track your performance. With the heart rate monitor, you can track your progress throughout your training and actual workouts.