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Monday, June 16, 2025

Reliability of Wrist Coronary heart Charge Screens – BionicOldGuy


https://www.cyclingnews.com/options/wrist-vs-chest-strap-heart-rate-monitor-which-is-better-for-you/ This text has a superb dialogue of accuracy ot wrist (additionally known as optical) measurements. They even point out that freckles can throw off the outcomes. Guess what! I’ve freckles on my wrist.

Gadgets that monitor our coronary heart charges primarily based on a measurement on the wrist are fairly prevalent these days, together with Fitbit, Garmin watches, and Apple Watches. There are additionally gadgets that promise extra subtle outcomes equivalent to coronary heart price variability from Whoop. These gadgets then inform us insightful issues about our latest exercises or our exercise all through the day, how lengthy we should always get better earlier than our subsequent laborious exercise, and even how effectively we’re sleeping.

The difficulty is that the accuracy of the information all this data relies on is suspect. I first seen this again once I had a Fitbit. It could typically learn larger than I suspected was appropriate, primarily based on how laborious I felt I used to be working. The identical is now true of my Garmin watch. I will be simply warming up, and it’ll inform me my coronary heart price is within the 130’s, which I do know can’t be true as a result of I’d actually be huffing and puffing. I just lately put it to a take a look at. I occur to even have a Polar H10 coronary heart price strap. And a separate system (my Garmin bike laptop). So on the identical trip, I made certain my watch was not paired to the strap, and solely had wrist information accessible for coronary heart price. My bike laptop was paired to the strap so it was a chest-based measurement. In such a comparability, we count on the chest measurement to be extra correct, however I used to be blown away how a lot the 2 differed. The 2 charts from a three-hour trip are proven under. The max coronary heart price from the wrist measurement was 41 beats two excessive, and suspiciously confirmed up once I was simply warming up. There are numerous different locations within the charts the place the wrist outcomes are simply not proper.

Chest Common Coronary heart price 80 Max 103
Wrist Common Coronary heart price 96 Max 144

I had been studying up on optimum coaching strategies primarily based on coronary heart price, all of which sound fairly scientific. However I now know that the information I used to be basing this on was untrustworthy (I often simply use wrist-based as a result of it’s an additional step to placed on the strap). Sooner or later I’ll make certain I take advantage of the strap once I actually need to test coronary heart price. I may also put extra belief in how my exercise feels (perceived stage of exertion).



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