When they do seem wrong, you’re probably right. If you find value in fitness trackers and inaccurate heart rate data is not a deal breaker for you, then you know to take readings with a pinch of salt. Whether or not you should use and trust your fitness tracker comes down to your individual goals as an athlete. ![]() Additionally, they can be worn all day long, while you’d generally take your chest strap off as soon as you finish training. However, if you don’t care about perfect accuracy or find chest straps uncomfortable (I know I did), a wrist heart rate monitor will do a good enough job most of the time. If you want to measure your heart rate with close to 100% accuracy or have very specific goals to meet with your fitness training, a chest strap is the way to go. Movement of sensor can disrupt accuracy.They sit relatively far away from the source of data.To summarise, there’s a handful of reasons why wrist optical heart rate sensors are at a disadvantage compared to chest straps: Why is heart rate data from wrist monitors wrong? The safety and scientific validity of this. While the study had some limitations – indoor treadmill running can’t necessarily be compared to running outdoors with varying terrain and different arm motions – the findings are supported by a 2020 study that analysed accuracy of optical sensors for athletes in different age ranges. Suitability of Unobtrusive Bed Monitoring and Wrist-worn Heart Rate Monitor for Patient Monitoring (BedMon). ![]() The study, which is free to read online, found that while wrist-worn heart rate monitors were accurate at rest, their accuracy decreased as intensity increased.
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