Suunto SHRB2 Firmware 3.2.6.8 Update

VoiGAS

@matram This doesn’t look sooo bad, because you have a visible line. Real bad grapghs have desolved curves, more like clouds of dots.

snow*

This is an outdoor rock-climbing session, during which the SHRM2 was subjected to a lot of stress. I’d say the result is satisfactory.

zoom in the 6:20–8:00 interval, a few hitches

ditto for 13:20-16:00

same setup: lcebreaker Tech Lite shirt + chest strap wet

matram

@VoiGAS
I asked Claude to analyse some recent runs. Claude’s key points …

The pattern is an early detection of a Heart Beat followed by a longer R-R for the following beat where the sum of two beats is accurate, so the problem is not likely to affect HR.

Early incorrect detection of a Heart Beat could be caused by ESD or poor belt contact.

For today’s longer run, the problem appears to go away after 12 min when running with Merino Wool. Which could indicate a problem with electrode wetness, maybe in combination with weather conditions.

For today’s run with SHRB2 there were 4.6% faulty beats. This is likely on the boundary when run-based DFA and HRV computations will no longer be accurate.

We did find one recent run with the Polar H10 which had 2.8% faulty beats. And many earlier runs with <0.5% faulty beats.

atoponce

@matram Except when there is bad R-R data, there is bad HR bpm data. Due to the R-R noise, I have bpm drops. Here’s my HR bpm data from the same run where I shared the previous R-R intervals. Whenever I have R-R noise, I have bpm drops.

Speed Man

@Dimitrios-Kanellopoulos I can’t find the option to display the R-R graph. Could you please tell me where I can find it?

Dimitrios Kanellopoulos

@Speed-Man it should be tehre if the activity has RR do you have a link for me so I can help and check ?

Maryn

What amount of artifacts (%) is the limit for a good measurement?

Dimitrios Kanellopoulos

@Maryn there will awlays be artifacts with belts. And not all libs do the same parsing.

So you need to establish the baseline in a way

Speed Man

@Dimitrios-Kanellopoulos https://quantified-self.io/user/Wn5k7NdDxrWRF578c9IxeLgywVB2/event/9396ac60cdc1f02c7999c0c580e248acdd389ad3eccd4950ff68664e32a77154

matram

@Maryn said in Suunto SHRB2 Firmware 3.2.6.8 Update:

What amount of artifacts (%) is the limit for a good measurement?

When I asked AI - the response was 3-5% for a DFA-a1 or HRV computation.

Maybe the time has come for an official response from Suunto?

Dimitrios Kanellopoulos

@Speed-Man check under RR and HRV both on the summaries and just above the charts Screenshot 2026-10-30 at 10.56.48 Screenshot 2026-10-30 at 10.56.43

Maryn

@Dimitrios-Kanellopoulos Yes, there will always be artifacts. My question is more about what percentage can be considered a good measurement, acceptable, for example, in terms of Zone Sense.
I used to have a lot of artifacts, and that was the reason I had to replace just the strap on my Suunto sensor. Since then, I’ve been getting results in the 0-1% range.

Speed Man

@Dimitrios-Kanellopoulos Can I view the data in a graph? I’ve been trying to find that option, but I can’t seem to locate it.

Dimitrios Kanellopoulos

@Speed-Man jsut press the hrv-rr button bro see my pic. The show charts button

Speed Man

@Dimitrios-Kanellopoulos I got it working now. Thank you very much!

stromdiddily

today’s run - stead 90 minutes, rainy weather, ON synthetic top

snow*

@isazi said:

Forwarded this discussion to the product manager at Suunto

Just checking in: has there been any progress since this was forwarded to Suunto’s PM? Thanks!

VoiGAS

Today wet belt and (different) merino - and a lot of noise

isazi

@snow I am not testing the HRM2, I only shared a link to this post, but have no way to check the testing firmware and if anything improved

atoponce

@VoiGAS I gave up on it. Got tired of battling it. Unfortunately, I’m outside of the 30-day return policy, so I’m stuck with it. I’ll wait for a firmware update that hopefully addresses it. Maybe I’ll just sell it. Went back to my Polar Verity Sense which has never let me down. I don’t have ZoneSense, but at least I have reliable HR.