Suunto Smart Heart Rate Belt 2
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there is something strange about your unit, afaic my heart rate reading is fine
Quite possibly. Paired the SHRM2 with the Garmin FR955 as well as the Race S and redid the 1 km run a few minutes ago. They both mirrored a crappy first minutes. And the FR955 had a couple of late spikes not seen on the Race S graph (perhaps the FR955 tried optical HR there…) I will redo the run tomorrow morning with optical forcefully turned off in both watches. If crappy HR again, the SHRM2 goes back to the seller. Race S:
Garmin FR955:
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@Inge-Nallsson before sending it back I would also try a factory reset…
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(perhaps the FR955 tried optical HR there…)
You can see this when using fitfileviewer… Garmin does record three heart rate streams. Wrist based, external and just “heart rate” what is represented by the graph in Garmin Connect…
Suunto Race S
Garmin Epix Pro -
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@Squirrel yep. Press the button for 20 sec until you see red green blue sequence (not sure in that order). You also need to cancel every past pairing from devices…
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@VoiGAS Can you share a before/after of your RR data and ZS charts by chance?
Suunto Race S / 9 Baro / Ambit 3 Peak / Observer
Suunto SHRB2 / Polar H10 / Verity Sense / OH1
Stryd Duo / Wind
r/suunto mod -
Oh God
. You want to buy best compatible accessories and got this 
. Also I can’t believe, that I’ll have somehow better Zone sense readings with SHRM2 compared to Polar H10. It’s only about R-R intervals and good signal IMHO. I’m glad for my H10. I only got strange R-R readings while I have extrasystoles during activity which I feel very well. I got ECG holter implanted. It’s a long story. But last months everything is fine and I feel it only time to time and also my R-R difference charts from cycling are perfectly clear.
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@HonzaS It’s hard to interpret the date if the scales are not equal and we don’t know wich data belongs to which source.
Watch: Suunto Vertical Titanium Solar (Sand)
SA: Android (beta)
HRS: Polar H10 -
@atoponce only the new one
Still some noise, but thats normal in the first few minutes. The old one was more like a bee swarm…
Edit: Must have been cheating to myself. Looks similar, not easy to compare because of the length. Thats why I thought the line is thinner…
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@VoiGAS Thanks. That is a lot cleaner than my data with my Polar H10. Here’s an easy run when I was tapering for a 50K recently:
And Runalyze’s view of ZS:
Suunto Race S / 9 Baro / Ambit 3 Peak / Observer
Suunto SHRB2 / Polar H10 / Verity Sense / OH1
Stryd Duo / Wind
r/suunto mod -
before sending it back I would also try a factory reset…
Removed the SHRM2 pairing from the FR955, Race S and Suunto App. Did the 20+ seconds factory reset and repaired the monitor to all devices again. Redid the 1 km running experiment with optical HR specifically and completely turned off in both watches. While the live HR data during the run looked plausible, there were oddities like 3-5 bpm differences between the watches (they should practically mirror eachother) and HR dips on a flat course that should see a slow steady bpm increase.
Stopped and saved, the session HR graph looked ‘OK’ on the Garmin but completely mangled on the Suunto. FR955:
Race S:
The HR graph in the Suunto App does not look mangled in that manner, but the dip right before the 3 minutes mark is very prominent. I’ve put the marker in both graphs at 6 min 10 sec on a flat section that signifies an obvious loss of signal. Suunto:
Garmin:
I will definitely initiate a return of the SHRM2. The faith in this unit is lost and questions about the overall hardware/software interactions are raised in my mind. Too bad… My Polar H10 died after a couple of years service and the ‘Suunto Smart Heart Rate Belt’ lasted only a bit more than a year (yeah, the pod became erratic). Optical HR is not a good option in the fast approaching winter conditions.
Suunto Race S
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You can see this when using fitfileviewer
Yes, but that site is such a pain to use on a phone. Hard to scroll, search and get a good view unless you have a mouse and a large screen. Would first have to mail the .fit file to myself before pulling it down to a seldom booted up computer… Too many hoops to jump unless being on an important quest.
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@Inge-Nallsson I absolutely have to check if I get the same problem when using multiple channels.
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@Inge-Nallsson point taken. I’m one of the people who still use a computer regularly and don’t force myself to do everything on a mobile phone…
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I’ve proceeded with a factory reset and :
slow run:
step up box:
and another good one from yesterday, so afaic issue seems solved:
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It seems to me that the numbers we see for GCT and FT in the app are for a full stride (left plus right leg) while the guidance numbers are for a single step?
From the Suunto app for a recent run (72 year old and slow runner if you wonder):
Average cadence 76 rpm
Average step length 158 cm
Avg GCT 449 ms
Avg FT 334 ms
GCT/FT relationship 1.336
Vertical oscillation 5.1 cm
GCT balance 51.6% - 48.4%Computing the cadence from GCT and FT - 60 / (0.449 + 0.334) = 60 / 0.783 = 76.6 rpm matches the 76 rpm cadence.
The guidance numbers are
GCT
Elite < 210 ms
Excellent 210 - 240
Good 240 - 270
Average 270 - 300
Poor > 300FT
Jogging 80 - 120 ms
Stable 100 - 150
Fast 120 - 180
Sprint 180 - 250If you take the average of GCT and FT, e.g. 250 + 150 ms, you get a cadence of 150, clearly for a single leg.
Maybe Suunto would like to clarify this? I do believe it is correct to show the numbers for a complete stride. It is the guidance numbers that are confusing.
At least I hope I am not “Extremely poor”
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@matram Yes, looks like. In my case its 290ms GCT and about 400ms FT. Makes no sense with the given description…
But your GCT/FT ratio is “Elite”. Not bad
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@VoiGAS for me (https://forum.suunto.com/topic/15857/running-form-metrics-oddities/2) its 259ms GCT and 435ms FT, what makes no sense either…
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@inge-nallsson @voigas @2b2bff
Did a 90m slow run today comparing with the STRYD Duo.Metric SHRM2 Stryd Cadence (spm) 150 151 GCT (ms) 456 465 VO (cm) 5.1 7.25 Symmetry (L/R) 49.6% / 50.4% 51.4% / 48.6% GCT actually looks fairly accurate (assuming Stryd would be the most accurate).
EDIT: corrected cadence for SHRM2 - had max before. This looks good.
Stryd has several different symmetries. Stryds ILR (Impact Loading Rate) balance looks closer to what Suunto is measuring at 50.2% / 49.8%.
Still struggling to turn these metrics into something you can act on in training. Anyone else had any success?
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