![]() ![]() Both watches write the heart rate information into files at random intervals (every couple of seconds). For outdoor activities I exported the data as GPX file and for indoor activities I exported the data as Excel file. Suunto 9 Wrist-HR and Suunto Ambit 2 with heart rate beltĪfter tracking the same workout with both watches, I exported the data from Movescount web app. Garmin, Apple and FitBit all use different technologies – Garmin uses its own optical-based Elevate sensor while FitBit uses PurePulse optical sensor. The same technology is also used by Suunto Spartan watches, Atlas Wristband, TRIO fitness sensor and some Scosche heart rate monitors. The Suunto 9 watch is equipped with wrist HR technology from Valencell. However, note that I only measured wrist HR with the Suunto 9 watch and I don’t know how accurate other devices with wrist heart rate technology are. Long story short, wrist HR technology is much more accurate than I expected, and in the following I’ll explain my findings. In the experiment I wanted to compare heart rate readings of Suunto 9 (wrist HR) and Suunto Ambit 2 (heart rate belt). I know that Suunto Ambit 2 with Dual heart rate belt provides very accurate heart rate readings as I’ve been using it for years. I wore both watches during four different activities: Outdoor running, treadmill running, weight training, and cycling. The Suunto 9 watch is not compatible with Suunto Dual heart rate belt and therefore it was measuring heart rate from the wrist while Suunto Ambit 2 measured heart rate from the belt. Therefore, I decided to conduct my own experiment.įor the experiment, I wore the Suunto 9 Baro watch with wrist-HR on one wrist and the Suunto Ambit 2 watch on the other, paired with the Suunto Dual heart rate belt. I’ve read a lot about the accuracy of wrist heart rate monitors online, but I haven’t found a single article that would be based on facts rather than on feelings and beliefs. Many new sports watches feature wrist-based heart rate tracking and ever since I bought the Suunto 9 Baro watch with wrist HR, I’ve been wondering how accurate the readings actually are. How accurate are wrist heart rate monitors?
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