In line with this principle, Garmin's wrist watches emit green light through the skin at the user's wrist, and then use a photodiode to detect changes in reflectivity that can be used to calculate heart rate. The rate of blood flow in arteries varies with the heart's contraction (systole) and relaxation (diostole) in a periodic pattern. A quick look at the 7 best heart rate monitors for Peloton users. Best chest-strap heart monitor: Polar H7. Best for extra fitness metric tracking: Apple Watch Series 7. Best for stress management This Study Says Yes. A new study found that the Apple Watch Series 6 and Garmin Forerunner 945 produced similar heart rate readings to an ECG. Even with the best fitness trackers and running watches, inaccurate heart rate readings are a common complaint. The optical heart rate sensors they use can struggle during intense exercise sessions, and In addition to making accurate health wearables, Garmin manufacture tracking and GPS devices for aviation, automobiles, and marine activities. Like the Garmin fitness trackers, the Garmin heart rate monitor uses a battery and does not require regular charging. It is on the less expensive side and may be a practical option for more casual users. Polar H10 Lifestyle (Image credit: Polar). Polar H10 is one of the most accurate heart rate monitors on the market. It features seamless connectivity and easily pairs with compatible fitness trackers, smartwatches, heart rate monitoring cardio equipment, Polar Beat — its affiliated app, and various fitness apps like Strava and Nike. The chest strap has the advantage of being a semi-direct measurement of heart rate. A good chest strap will be close to 100% accurate. Which makes sense, because it’s essentially reaching into your chest cavity and recording each beat with a clipboard. As we’ll see later, many wrist monitors are not as accurate. This one also doesn't get much higher than 100. It also tells me my HR is near 100 when it is in the 70s. Hope they fix this. Up +3 Down. 0 swad over 4 years ago. I have been pleasantly surprised by how accurate my FR245 WHR appears to have been for the month of running workouts I have recorded. defjoe over 6 years ago. [h=2]Fenix 5 heart rate accuracy. [/h] Today, 09:49 AM. Bought a Fenix 5 last week. Overall very pleased with it. Heartrate during cycling seems to correspond with the heart rate on my Edge 1000 and heart strap. During the day though everytime I get up and start moving around, the heart rate goes up to 70, 80, 90 or The New Garmin Watch: More Accurate Heart Disease Detection. Garmin is a wearable technology company that specializes in heart rate monitors and other health-related devices. They recently improved their watches’ accuracy by detecting heart problems with greater precision than other wearable technologies. Many of the personal health and activity insights offered by Garmin wearables come directly from or by analyzing heart rate data. 9LaV.