Image source: Wahoo

Best heart rate monitor 2021: chest straps & arm bands for exercise

If you’re after a heart rate monitor, the choice is between a chest strap, wrist band watch or armband tracker. What’s best depends on your needs – there are pros and cons to each type.

Table of contents

Why wear a heart rate monitor?
Types of heart rate monitors: watch, chest strap, armband
Heart rate chest strap vs wrist: the difference in accuracy quantified

The best heart rate chest straps

    1. Polar H10
    2. Wahoo Tickr X
    3. MyZone MZ-3
    4. Garmin HRM Tri
    5. Suunto Smart Belt
    6. Moov HR Burn & HR Sweat

The best heart rate arm bands

    1. Scosche Rhythm 24 
    2. Polar OH1+ 
    3. Wahoo Tickr FIT
    4. MioPod

Why wear a heart rate monitor?

Most people who exercise will tell you they want to lose weight or simply get fitter. Not many people, however, know what their heart rate is, or where it really should be.

This means that often, they are not training in the most efficient way to achieve their goals. The only way to actually know how many calories you’re burning while you’re exercising is to have a heart rate monitor that is consistently hooked up. All top athlete’s heart rate train, as they know this will help them to reach their top potential in the shortest amount of time possible.

Your body has five heart rate zones. Which zone you spend most of the workout in depends on your goal. For fat burn you want to go for zone 2, to build-up endurance zone 3, while zones 4 and 5 are for hard-core training. Typically you can spend very little time in the high zones.

Essential reading: Heart rate zone training with wearables

In simple English, this means that if you want to burn calories and burn fat drop your pace a bit. If you want to build up speed go for a quicker pace. You can read in detail about heart rate zone training on this link.


Types of heart rate monitors: watch, chest strap, armband

A heart rate chest strap detects your pulse electronically and sends that data to a receiver, such as a smartphone or a wrist-worn tracker. This is similar to what you can see in hospitals with patients who have sensors strapped to their chest. These type of monitors tend to be highly accurate.

The same is the case for heart rate rate trackers that you slip on to your upper or lower arm. This have only started to become available of late. But they have the advantage over chest straps in that they are more comfortable and much more easier to put on.

Fitness trackers, such as those made by Fitbit, Apple or Garmin, monitor your heart rate from the wrist. They operate by shining a light, which is then reflected by blood vessels passing through your veins. When your heart pumps, the blood moves through your veins at a quicker rate, causing less light to be reflected back. The wrist worn device then calculates your heart rate using an algorithm.

While this is a more convenient way of tracking your ticker, the accuracy can never compare with chest or arm band style monitor. If you are very serious about heart rate training, a chest or armband monitor is the way to go.


Heart rate chest strap vs wrist: the difference in accuracy quantified

A recent study has quantified the difference in accuracy between heart rate chest straps and wrist based heart rate monitors. It was published by the Cleveland Clinic in Cardiovascular Diagnosis & Therapy.

The study recruited 50 healthy, athletic adults (34 men, 16 women) with a mean age of 29. They all ran on a treadmill for 12 minutes with a three lead ECG and Polar H7 chest strap monitor and two randomly assigned, commercially available, wrist-based heart rate monitors. One was warn on each wrist. These included the Apple Watch Series 3, Fitbit Ionic, Tom Tom Spark 3 and Garmin Vivosmart HR. The speed of the treadmill was increased gradually, starting from 4 miles per hour to a final 2-minute stretch at 9 miles per hour (at zero incline).

The researchers then pitted the results from different heart rate monitors against the ECG. Unsurprisingly, the Polar H7 chest strap had the greatest correlation coefficient with the ECG (rc=98). This was the case at all paces. The Apple Watch was next (rc=96), followed by the other three wrist-based heart rate monitors which all had a similar level of agreement (rc=89). Each of the four watches was assessed a total of 25 times.

Whats more the study found that as runners went faster, accuracy of wrist monitors tended to suffer. The Apple Watch Series 3 fared best, once again. At 9 mph it was only off by 1.5 bpm, as compared to nearly 3 bpm for the Garmin.

However, at rest the difference was negligible. This would suggest that it’s perfectly okay to use such devices to monitor heart rate at low intensity activity and to keep tabs on resting heart rate which is perhaps one of the most important indicators of health and fitness of an individual.

This was not the first such research by Cleveland Clinic. An earlier study looked at accuracy of wrist-based wearables while participants were using a treadmill at moderate speed (up to 6 mph). The agreement with ECG was as follows: Polar H7 chest strap (0.99), Apple Watch (0.93), Garmin Forerunner 235 (0.92), Tom Tom Spark Cardio (0.88) and Fitbit Blaze (0.76).

It’s worth noting, these conditions do not exactly replicate running outdoors or on a different terrain. Furthermore, because they are running on a treadmill participants were in some instances recorded when gripping the treadmill handrail.

So what can we take from all of this?

While fitness trackers and smartwatches provide a more convenient way of tracking your ticker, the accuracy can never compare with chest or arm band style monitor. Particularly for high intensity workouts. 

This may change in the future as accuracy of smartwatch and fitness band heart rate monitors improves. But for now we are still not there.


The best heart rate monitor chest straps

To come up with our selection of best heart rate monitors we’ve examined functions and features of each device carefully and thoroughly. We try to test everything personally, but where not possible we took user reviews into consideration and dismissed devices with bad customer reviews and low ratings.

Polar H10

The H10 is an updated version of Polar’s best selling H7 heart rate monitor. Just like its predecessor, it includes a soft fabric chest strap that seamlessly adapts to your body shape. There is a new buckle mechanism and silicone dots that help keep it in place during training, and interference-preventing electrodes that help ensure heart rate is captured accurately.

hr monitoring
Image source: Polar

The H10 now provides internal memory. This can be handy in situations where you want to leave your phone behind. The tracker can only store one heart rate training session at a time so you need to sync right after the workout.

You can use your H10 strap with a number of different products as well as compatible gym equipment. The device is waterproof so you can wear it for swimming although the Bluetooth connectivity will not work. 

The chest strap works with the excellent Polar Beat app. This makes using it very easy and all the data is presented in simple to understand charts. 

Best features

  • excellent accuracy
  • non-slip design
  • can connect two devices concurrently
  • water-resistant

Bottom line: In our review we found the Polar H10 chest strap works well. If you want a reliable heart-rate monitor and can live with strapping onto your chest, the H10 is one of the best options out there.

Heart rate chest strap


Wahoo Tickr X

hr monitoring
Image source: Wahoo

Tickr X is the most advanced of Wahoo’s three heart rate training chest straps. In addition to information on your ticker, the device measures calorie burn, running form metrics, indoor run, spin cadence and counts reps during strength training.

Its internal memory can store up to 16 hours of heart rate data allowing you to leave your smartphone behind and sync later. The tracker is compatible with over 50 third-party apps including Nike+ Running, MapMyFitness, Runkeeper, Strava, Apple Health, and Cyclemeter/Runmeter.

Both ANT+ and Bluetooth 4.0 capabilities allow the Tickr X to connect to GPS watches, iPhones and Android devices. You can also link the strap directly to the Apple Watch to get heart rate data in the Workout app.

All things considered, you’ll struggle to find a better value in a heart rate monitor than the Wahoo Fitness Tickr X.

Best features

  • Measures more than just hear rate
  • Works with many third-party apps
  • Both ANT+ and Bluetooth connectivity
  • Great value for money

Bottom line:  This is the most advanced heart rate monitor manufactured by Wahoo. TickrX works with lots of apps and has plenty of on-board storage memory. Couple that with ANT+ and Bluetooth connectivity and a low price and you’re sitting on a winner.

Heart rate chest strap


MyZone MZ-3

hr monitoring
Image source: MyZone

MyZone has been in the chest strap heart rate monitoring game for a while now, mainly dealing with gyms and health clubs. The novelty of the company’s MZ3 is that it adds a level of competition to regular heart rate training.

Best heart rate training chest straps
Image source: MyZone

As the name suggests, everyone has different fitness zones that change over time. The MZ3 identifies, rewards and adapts those zones and displays that information in five tiles based on the intensity. It then uses a points based system to turn fitness into a fun exciting game. The company claims that its chest straps deliver readings with 99.4% EKG accuracy.

The MZ-3 allows you to view your physical activity data on your smartphone via bluetooth in addition to on-screen at participating gyms via ANT+. It also works with a host of third party apps.

Best features

  • Gamifies fitness
  • Displays heart rate zone on tracker
  • Bluetooth and ANT+ connectivity

Bottom line: The originality of this chest strap is that it adds an element of gaming into fitness. The goal of the points system is to make working out more fun. Other than that you get all the standard features of a heart rate monitor including good accuracy.

Heart rate chest strap


Garmin HRM Tri

Best heart rate training chest straps
Image source: Garmin

This is a heart rate strap specifically designed for triathletes.

Best heart rate training chest straps
Image source: Garmin

The built in accelerometer reports six running dynamics metrics including: cadence, stride length, ground contact time, ground contact time balance, vertical oscillation and vertical ratio. The HRM-Tri stores heart rate data even when underwater, then forwards it to your wearable at the end of your swim.

This is Garmin’s smallest and lightest heart rate monitoring module and it fits within the width of the strap. The strap’s soft, rounded edges and covered seams it super-comfortable in or out of the water. The battery lasts an impressive 10 months (assuming 1 hour/day use) with user-replaceable CR2032 battery.

Best features

  • For triathletes
  • Spits out performance metrics in addition to heart rate
  • Swimproof
  • 10 month battery

Bottom line: This is a feature-packed chest strap, ideal for those that are in the Garmin ecosystem. No need to charge, swim proof design and running metrics make the product attractive. If you like to cycle, swim and run, this is the one you want.

Heart rate chest strap


Suunto Smart Belt

hr monitoring
Image source: Suunto

Size really matters. At least it does if you ask Suunto. The company says their product is the smallest Bluetooth Smart compatible heart rate sensor on the market right now. And they might be right. The sensor module is tiny and weights only 40 grams, while the strap width is only 30 millimeters.

When running, the tracker provides real-time heart rate data and calories burned. You can use it while swimming as well, as its water resistant up to 30 metres.

While you are in the pool the sensor stores up to 3 hours of heart rate data. When you are back on dry land, sync the device to your Ambit 3 watch or the Suunto smartphone app on your Android or iOS phone for post workout analysis.

Best features

  • Streamlined, lightweight design
  • Swimproof
  • Storage memory

Bottom line: Another good option, the Suunto heart rate chest strap has managed to squeeze all the tech into something very small. If you own a Suunto watch than its a no-brainer. 

Heart rate chest strap


Moov HR Burn & HR Sweat

Moov is a company which has consistently taken an innovative approach to activity tracking. The outfit has recently come out with HR Burn, its first heart rate monitoring chest strap. It joins the EKG-accurate HR Sweat, which was announced last year.

Both trackers will guide you to get the most out of your workouts and keeping burning those calories hours after your workouts. Simply follow the voice coaching which will keep you in the correct heart rate zone. Workouts are adjusted with variety and intelligence to get you the right intensity.

hr monitoring
Image source: Moov

While HR Burn functions like a regular chest strap, HR Sweat sits on your high temple to get what Moov says is a more accurate pulse reading than from your wrist or chest. The device shines a LED light to illuminate the skin and measures changes in light absorption. The amount of light absorbed by the tissue is affected by the perfusion of blood that occurs as blood pulses through your body. HR Sweat uses these changes to determine your heart rate.

In terms of design, the sensor slips into a sweat-absorbant headband. It also comes as Moov HR Swim, the exact same technology in the form of a swim cap. This means you can get reliable heart rate data during those pool sessions.

In terms of battery life, expect to get six hours of continuous use, one week with daily use and one month of standby.

Best features

  • Also comes in the format of a sweat band
  • Voice coaching
  • Swimproof
  • Great battery life

Bottom line: Who knew that the forehead is one of the best places on the body to measure heart rate? The alternative is to opt for the Moov chest strap. Both work with the same EKG-accurate technology.

Heart rate chest strap


The best heart rate monitor arm bands

Scosche Rhythm24

Scosche Rhythm 24 comes with waterproofing and one-day battery life
Image source: Scosche

Our heart rate monitor review would not be complete without looking at armband style monitors. These have grown in popularity in recent years due to their convenience.

Scosche has a hyper-accurate armband heart rate monitor which boasts both Bluetooth Smart and ANT+ connectivity. RHYTHM24 brings a number of improvements over its predecessor As its name implies, the gadget will now run a full day between charges, a significant boost to the 8 hours of its predecessor.

Another important upgrade is waterproofing. The second generation device has an IP68 water-resistance rating, which means it will just about survive a swim session. Just as important, RHYTHM24 also comes with internal memory which safely stores your readings allowing for phone-free training.

There are five training modes and two multi-modes to choose from and a LED battery indicator with lights to indicate heart rate zones. On top of that, the device boasts a heart rate variability (HRV) mode that monitors the time between each heartbeat for stress and recovery tracking. There are also profiles for a number of activities such as swimming, running and cycling.

Best features

  • Excellent accuracy
  • 24 hour battery life
  • Water-resistant
  • Internal memory
  • Lights to indicate heart rate zones

Bottom line: In our review we found RHYTHM 24 to be light, comfortable and accurate at measuring heart rate. If you are planning to ditch the old chest strap, Scosche’s latest arm band presents one of the best options out there. 

Heart rate chest strap


Polar OH1+

Best heart rate training chest straps
Image source: Polar

Polar’s middle of the road solution features a great design with a few options in term of where you can wear it. There is actually very little not to like. What impresses most, though, is the accuracy of readings. Its close to what you would get with a heart rate chest strap and much better than a wrist based heart rate device. The Polar OH1 comes with BLE/ANT+ connectivity and attaches to swim goggles to measure heart rate from the temple.

Its main competitor is the Scosche Rhythm24. Identical in price, both dish out data of similar quality. In OH1’s favor is better waterproofing, and the fact that it’s smaller and more discreet as all lights are on the underside of the unit.

Best features

  • Excellent accuracy
  • Light, comfortable
  • Attaches to swim goggles
  • Bluetooth, ANT+ connectivity

Bottom line: Polar has a very competitive standalone optical heart rate sensor in its product range. It’s light, comfortable, has memory for caching, a great software ecosystem and is easy to sync. 

 

Heart rate chest strap


Wahoo Tickr FIT

Best heart rate training chest straps
Image source: Wahoo

This is another heart rate monitor for those that like accuracy but dislike the chest strap. Similar to its two competitors, the Tickr FIT comes in a comfortable form factor. The elastic band can be slipped on either the inside or outside of the forearm, but unlike its competition not on the upper arm.

The heart rate monitor uses a trio of green LEDs around an optical sensor to ensure accuracy. It comes equipped both with Bluetooth and ANT+ technology to pair with fitness apps, smartphones, and GPS bike computers and watches. There is no internal memory though and its water-resistance rating is only IPX7, so don’t plan on going swimming with it.

Best features

  • Comfortable
  • Bluetooth, ANT+ connectivity
  • Good value for money
  • Weights only 19 grams
  • 30 hours of battery life

Bottom line: This is a solid offering that comes in at a reasonable price. If you’re in search for an alternative for a chest strap it may be an option worth considering.

Heart rate chest strap


MioPod

MioPOD is an armband that guides your performance intensity

The final device in our overview of the best heart rate monitors is MioPod. It comes with Valencell optical sensor technology to deliver a cleaner signal with less noise than typical heart rate straps. It performs particularly well at high intensity exercises such as HIIT and weight lifting, and can stream heart rate to other devices thanks to NFC / BLE / ANT+ Connectivity.

Whats more the device delivers haptic alerts and LED with colour prompts for heart rate zones. Around 30 hours of biometrics can be stored on the thing, it is swim-proof (5 ATM) and battery life is around 24 hours.

In addition to performance analytics and a personalised training plans, the accompanying smartphone app dishes out a bunch of Firstbeat analytics including Recovery Time, Training Effect and Training Load. The gizmo also plays nice with other apps such as Runkeeper, Strava and Zwift.

Best features

  • Performs well at HIIT
  • Haptic alerts combined with LED prompts
  • Internal memory
  • Swimproof
  • Firstbeat Analytics

Bottom line: The most recent addition to this list, the MioPod is a highly accurate device that comes with plenty of useful features. This represents Mio’s first effort since it pulled back from wearables in 2017. We’re glad the company is back and this certainly seems like a solid first offering. 

Heart rate chest strap


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3 thoughts on “Best heart rate monitor 2021: chest straps & arm bands for exercise

  • If you do a follow-up post it would be good to include those wearables that include heart rate and breathing tech directly in the fitness garment.

    Reply
  • This is a great article! I really appreciate the time and effort that went into making this article. I was wondering if there are any articles that include recommendations. I was also wondering if the MyZone heart monitor connects to any other apps (like MapMyRun).

    Reply
  • For once, some decent data/feedback on questions I have been asking for many years! I have had a heart condition for 13 years and have always used a SUUNTO. It has tracked very well against all ECGs (within 1-2 bpm), however, it can give very wayward results that leave me frustrated at times. For instance, this morning, when I started training, my heart rate suddenly dropped 11bpm, then shot up 26 and started to normalise after about 7 mins…. So I am researching which chest straps are currently the most accurate (as one of my doctors once said- the closer to the heart that you measure, the more accurate the reading will be. If we wanted to use your wrist for ECGs, we’d put the electrodes there!).

    Reply

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