How Accurate Are Watch Heart Rate?

Wrist-based readings during runs

• modern wrist based sensors are fairly accurate. they do have some anomalies and hiccups compared to chest straps though. a good chest strap is still the gold standard for running.
• for what you’re saying you want to use it for it should be accurate enough.
• current wrist-based heart rate monitors are fairly accurate most of the time, however they can suffer from issues like cadence lock.
• if you are planning to train based on heart rate (i.e. figure out your max heart rate, and train based on specific zones), i would 100% definitely recommend getting chest strap heart rate monitor.
• but if you're just someone who glances at your heart rate occasionally during your run, then i'd say a wrist-based heart rate monitor is more than sufficient.

Chest straps and wrist devices

• i notice many people are using a monitor on a chest strap. does anyone else do this? is there a big variance in accuracy? i read watches are less accurate
• i don't need perfect accuracy but it is important to me that the bpm is not wildly off as i am running based on this bpm number / heart rate zone for a good number of my runs.
• my wrist watch (apple watch 6) is often more accurate than the chest strap (garmin dual ...something), at least in the beginning of runs when the chest strap picks up cadence.
• i wore a garmin with chest strap and apple watch for the same runs over the course of two weeks, and for me, apple watch was close enough. at most it was 5bpm off for a minute or two, but fairly in sync with the garmin chest strap.
• use a chest strap. i've used one in a test and the strap is better
• chest straps are known to be more accurate than wrist devices due to physical factors. the latest apple watch is rated to be just about as accurate as garmin rates it's chest strap.

Accuracy changes by device and activity

• accuracy can differ depending on which numbers are being monitored, which device is being used and what level of activity you are doing.
• for example, step count has generally been found to be the most accurate measure.
• numbers such as heart rate vary depending on the tracker being used and the intensity of activity.
• one review that looked at the evidence found that the higher the intensity of exercise, the less accurate the heart rate reading.
• you should not pay too much attention to any one-off reading from a fitness tracker.
• it is the overall trends that are most important.
• for example, if you notice a heart rate reading that is lower or higher than usual, it is likely nothing to worry about.
• but if you notice unusual readings regularly, or you see numbers trending up or down in an unusual way, let your doctor know.

Heart rate monitors and technology

• heart rate monitors measure how fast your heart is pumping in beats per minute (bpm).
• they’re usually small and wearable as a watch, an arm band or a ring, allowing you to track your heart rate all day or even at night.
• while they’re often reliable and convenient, they’re no substitute for check-ups and tests from a healthcare provider.
• instead, they offer more information that you can share with your provider.

heart rate

your heart rate is the number of times your heart squeezes per minute to push out blood.

pulse rate

your pulse rate is the number of times your arteries widen and narrow in response to your heart’s activity.

reported data

usually, these numbers are the same or very close. that’s why devices that technically measure your pulse still report that data as “heart rate.”

abnormal rhythms

some monitors can even detect abnormal rhythms.

EKG and PPG monitors

• heart rate monitors that use ekg technology are the most accurate.
• those that use ppg — especially the latest models — are often highly accurate.
• but it depends on the exact one you’re using.
• researchers are constantly testing heart rate monitors to learn more about their accuracy.
• getting the right reading is important for anyone, but especially for those who have heart disease or conditions that require close monitoring.
• monitors that underestimate heart rate can be dangerous because they give you a false sense of security — you think your heart rate is lower than it actually is, and you may push yourself harder during a workout.
• in general, heart rate monitors that use ppg (detecting your pulse) may be less accurate if: melaninthe intensity of your workout

Fitness trackers and medical tests

• wearable digital devices that can count calories, steps and heart rate are now an important part of how we look after our health.
• whether they are speciality wrist-worn devices or apps built into smartwatches, fitness trackers are becoming increasingly popular.
• heart rateblood pressure monitoringsingle-lead ecgs (a simple type of electrocardiogram with one electrode sensor) which can read heart rhythms and rates. but these are not as reliable as proper medical tests.
• medical testsand are not designed to give a diagnosis. they are primarily intended to help monitor fitness.
• however, they can be helpful for monitoring health, so if you start to seenumbers or trends that worry you, let your doctor or nurse know so that they can look into it.

Atrial fibrillation readings

• abnormal rhythmsatrial fibrillation.
• however, the result can be affected by the position of the wearable and your movements.
• they can also detect harmless extra heartbeats.
• all of which can affect the quality of the ecg reading.
• single lead ecgs are not as accurate or detailed as a 12-lead ecg, the type that your doctor would use to monitor you.
• however, if you see readings that are out of the ordinary, you should get in touch with your doctor or nurse, sothat they can advise on whether you need further tests.

One-off readings and trends

• if there is no direct medical necessity, then your watch is more than accurate enough.
• you could also consult a doctor or gym to see if you can get a real test where they hook up multiple sensors and give you the no motor treadmill.
• wear your watch during the test and compare
• if you’ve ever wondered how fast your heart is beating while you’re walking, stressed or even just sleeping, a heart rate monitor may be right for you.
• but these devices might not always give you precise readings.
• plus, it can be hard to interpret the numbers you’re seeing or know if you’re in a healthy range.
• that’s why it’s important to see a healthcare provider for routine check-ups.
• tell them if you have any concerns about your heart rate.
• they’ll help you make sense of the numbers.
• and they’ll run tests if needed, to gain a bigger picture view of what’s going on.