Amazfit Heart Rate Sensor Continuous Accuracy

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• #1

So I bought the pace model.
Did an interval workout on the treadmill, after I checked the app it measured 195 heartbeats/second. Which was nice and well becase i know thats where I end up at the end of those 4 minutes.

However, after that I did some strength training, and then finished off with some uphill walk on the treadmill where the treadmill measued 150 BPS, and my watch... 88 BPS. I know 150 is more accurate because my breath was around there.

After that, it hasnt been able to register anything over 110 BPS. Tried it for several workout sessions, still doesnt measure above 110. I tried factory reset.. doesnt change anything.

Someone else seen this?

• #2

I'm testing one amazfit and comparing with one garmin 630.
Amazfit measures correct just after 10 minutes of workout and then, after some minutes it measures wrong about a minute or two, and back to measure correct again.
Very bad algorithm.

• #3

Has nothing to do with bad algorithm.

Why do you guys think that there is no gym workout on the watch?
Because there is no known wrist hr sensor that is working correct for that.

Doing workouts means bending and flexing the wrist, which means that the sensor looses contact, which means inaccuracy .

And 90% of people that complain, have the sensor on a spot that is not really working.
Have seen very hairy guys complaining or people that have the watch "between the hand and the bone".
And make sure it is tight.

• #4

I checked the app it measured 195 heartbeats/second.

Holy crap, 195 beats PER SECOND!!?!! How are you still alive? Are you The Flash? Or possibly some kind of super smart hummingbird with an xda account (that would be cool).

Jokes aside, I also find the HRM on the Pace problematic.

It seems to work ok when you do "check now" as long as you stay still and its on tight. But whenever I use continuous HRM or do an activity like biking the reading seems to be about 20+ bps too high.

For example, I did "check now" just before a bike ride and got 65bpm, then again right after the ride and got 104bpm, but the bike activity recorded a starting heart rate of 84bpm and an ending rate of 134bpm.

• #5

yeah, sometimes my watch seems to measure my heart rate correctly, but other times it shows quite strange results.

• #6

I just finished indoor cycling workout. I used together Suunto Ambit watch with HR strap and Amazfit Pace. Amazfit HR data is useless. Here is merged image with both graphs.

Amazfit was tight, and my hand didn't moved to much. I tried several times to move hand on different positions to check is there any improvement, but without change.

Here is paralel graph (top is Suunto, bottom is Amazfit)

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• #7

sometimes when physical exertion increases (when I go up a slope, for example) the heart beats are reduced.

• #8

The HR sensor in the pace seems about as accurate as someone guessing your heart rate from across the room.

• #9

Yes the bip is the same.
Absolute ****.

• #10

I've compared it with Polar watch + chest strap. There were differencies in the meassured pulse, however the average pulse for the trainings was very close on both devices. What is important for Peace, it has to be fastened very tightly on the wrist.

Wysłane z mojego ALE-L21 przy użyciu Tapatalka

• #11

I have compared Amazit Pace (1.3.6d) with Garmin Chest Strap HR monitor and FR235 doing Interval training running, and to FR235 optical HR monitior doing indoor biking.
In both activities Amazit Pace worked inestable the first 10 min then worked showing nearly same HR thank Strap HR and optical HR monitors.
Amazfit Pace showed a sudden decrease in HR reading about the middle of activities (about 1 hour each) and then back to proper reading.
In summary, Amazfit Pace uses about 10 min to have proper HR values, and sometimes during the activity has sudden decreases in HR reading.
For the rest of activity it performs quite well.

• #12

but you know that you can pair amazfit with a heart rate monitor strap, for example Polar H7?

• #13

This is about the Pace, and that can't be paired with a strap.

• #14

This is about the Pace, and that can't be paired with a strap.

oh, ok, i was talking about Stratos

• #15

heart rate sensor go crazy

I have the pace model too

sometimes (recently with more frequency) the heart rate sensor go crazy

yesterday, when i did an Indoor Run, he show the alert: "heart rate too low: 75", seconds after this, he show: "heart rate too high: 185", seconds after: "heart rate too low: 81", "heart rate too high: 172", etc etc.

Someone else seen this?

Someone know how to fix it?

• #16

I have the pace model too

sometimes (recently with more frequency) the heart rate sensor go crazy

yesterday, when i did an Indoor Run, he show the alert: "heart rate too low: 75", seconds after this, he show: "heart rate too high: 185", seconds after: "heart rate too low: 81", "heart rate too high: 172", etc etc.

Someone else seen this?

Someone know how to fix it?

Is the watch brand new? Do you sweat a lot? Check the cover of the HR sensor, some people that had used the watch while bathing/showering had problem with the cover getting loose.

• #17

Is the watch brand new? Do you sweat a lot? Check the cover of the HR sensor, some people that had used the watch while bathing/showering had problem with the cover getting loose.

I bought my pace in Feb/18 (3 months ago)
my sweat is near to zero
never bath/shower using it
the pace work well until one week ago, when i need to do a factory reset because something was draining the battery too fast (one charge in one night)
after the reset, the battery issue has gone, and the watch work well until yesterday (when the HR sensor issue start)
thinking about do one more factory reset... :fingers-crossed:

• #18

just to illustrate: HR (red) x Cadence (blue)

• #19

I have the pace model too

sometimes (recently with more frequency) the heart rate sensor go crazy

Someone know how to fix it?

Same issue here, with every Rom update HR accuracy gets worse in Sports activities. Continuous HR monitor seems accurate when compared to my chest strap, but goes haywire and at least 50% off true when in Run Indoor and Cycle indoor. Elliptical seems to be accurate at least some of the time. Have factory reset many times but nothing seems to help.

• #20

Yesterday I realized that with new ROM update, Peace have option to connect to other Bluetooth sensor(s).

I tested it and it with cheap 20$ Bluetooth sensor and works nice.

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Source: https://forum.xda-developers.com/t/amazfit-pace-very-inaccurate-heart-rate-sensor.3710024/

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