HR reading problem
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HR reading is not correct on exercise. Since 3 weeks the HR reading goes on the start of exercise to 160-170 when the correct reading would be 80-90. I take the watch of and clean it on the trousers. After that I have the same result wrong HR reading. If I repeat this once more than the HR reading starts to be accurate. What is wrong.
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What I have found with wrist-based HR sensors is that in order to get a good snug fit, I have to move the watch further up my wrist (1-2 inches).
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@Maciej-Krenek Sounds like a cadence lock to me. Was it always a problem, or only in the last few weeks? Did you try simply continue going?
I don’t remember any updates from Suunto. As mentioned by @Vinay-Menon, please make sure the watch is snug on your wrist, but not too tight, and at least 2-3 cm above wrist bone. I think I had Suunto 7 lock on my cadence once or twice, but it quickly recovered in those cases.
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@Maciej-Krenek Cold and dry weather make the HR readings worse for me, they are typically much better in the summer. But my S7 is usually in very good agreement with my S9 and HR belt.
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@Maciej-Krenek I have the same issue with my new Suunto9 baro. Actually the HR was OK for a while but now it is way too high at the start and does not correct after a few kms even if I stop, stop the watch, take it off, wipe it, wear it 2-3cm up my arm - I have tried all the tips. I cannot use the OHR at all which would be nice for some runs where I don’t want to wear a chest strap. Also it messes up my data because Movescount and Strava think I have been exercising at 180 when I am at 140. I reckon it is 40 beats out. For such an expensive watch you would expect a little more accuracy even from OHR… Any suggestions??? Thanks
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@loopylou72 this post is about the Suunto 7.
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is there a post with the same problem for the suunto 9?
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@loopylou72 try using the “search” function of this forum, or start one.
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@loopylou72 said in HR reading problem:
is there a post with the same problem for the suunto 9?
Many, in fact the S9 OHR does not work well for me unless I wear the watch on my forearm. The S7 is rock solid for me 95% of the time.
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@loopylou72 Oh, you are for an early weekend of reading my friend
So many posts, so much anguish 
But I’ll spare you our pain, two years in the making and just give up the ending. Spoiler alert!For many people, yours truly including, a unique combination of S9 height, weight, and soft stretchy silicon strap results in slight wobble when running, which completely throws off recent vintages of Valencell sensor firmware and produces all sorts of OHR artifacts, from completely lost HR readings to insane spikes to 190-200 when known max HR is more like 180. Worse still, this can happen at any point in the workout.
The only known workaround to resolve this sad state of affairs is:
- Soak sensor beforehand… I don’t mean wash it, but put the watch on a good 5-10 min before the exercise and give it time on Start screen to lock on HR and stabilize reading, usually at least about half a minute to a minute
- Wear a band of sorts, like those tennis wristbands that would ensure the watch stays away from wrist and the band pushes it up to prevent wobble
- Switch to a textile loop band if you can get one (they are constantly out of stock at Suunto – probably S9 owners busy buying). It does improve things dramatically but for accurate HR, I found it to be sadly insufficient by itself hence steps above
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@NickK Well said…I managed to snag both the black and red textile bands…
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@Brad_Olwin Good man! I only got red
But it’s pretty spiffy, looks even batter with black S7 -
@isazi yes I did but found this one - did not want to start a new one as I know there would be a lot already!
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@NickK THANK YOU! I have tried the soaking… did not seem to do anything including having it on for a drive to the start of a run. I did actually think about buying a new strap as I have the copper baro and the strap sticks out from the sides of the watch so it is hard to get a snug fit without my hand going numb… I will look out for one. Tennis wristband - ‘sweatband’ - or a buff! Will try that also. It is weird though as it did work really well when I first got the watch and now is 100% fail. Not sure if it is due to updates?
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Ever thought about shaving your wrist?
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@loopylou72 said in HR reading problem:
It is weird though as it did work really well when I first got the watch and now is 100% fail. Not sure if it is due to updates?
Exactly my story. When I got my S9 in September 2018, the OHR was rock solid for me. I started to forget how a strap looked like. If not for gym, would have totally misplaced it. Then around summer last year things got worse. And by late fall the OHR became close to unusable. I don’t know what to say… Maybe it’s aging silicon in the strap that gives the watch too much wobble. Maybe it’s the firmware updates. For now I just gave up on using S9 OHR.
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@Łukasz-Szmigiel said in HR reading problem:
Ever thought about shaving your wrist?
I would shave any part of my body if it were to make S9 OHR work, but… Polar and Garmin seem to work just fine without any manscaping
As does Suunto 7. So, let me keep my fur! It’s still cold outside. -
@NickK said in HR reading problem:
@Łukasz-Szmigiel said in HR reading problem:
Ever thought about shaving your wrist?
I would shave any part of my body if it were to make S9 OHR work, but…
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@NickK sounds reasonable enough
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@NickK thanks for the info - will try a textile strap… but of an expensive fix but the strap on the baro has these rigid sides that do not fit my wrist very well anyway compared with my other suunto which has a silicon strap (also dodgy OHR but also the elevation started to read really low!)