OHR Sensor often good BUT WHY SOMETIMES NOT
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@GiPFELKiND I think this has to do with a lot of factors. My guess is that these are mainly skin tone, blood vessels and muscles.
When I go running I wear my watch tight. During the first minutes, the HR has it’s ups and downs somtimes by 20 bpm. Further into the activity the measurements get more steady. My guess is that this has to do with my body getting warmer and blood vessels are better picked up by the sensor.
During winter runs this “warm up” period takes a lot longer, so I tend to use a chest strap during the colder days.The other factor could be muscles.
If I wear my watch with the same tightness during a windsurf activity, the HR spikes all over the place. This could be because the body isn’t getting as warm as during a run activity, but I guess it mostly has to do with the muscle movement in my hand and wrist. I do have a rather skinny wrist and muscle tension could influence the sensor readings because it moves the watch.During no activity, I noticed the readings are pretty consistant after 5-10 sec warm-up time. When I start an instant HR reading it always starts about 20 bpm too high and then drops to the correct reading in the next 10 seconds or so.
Overall, I am very happy with the wirst HR measurements but your mileage may vary
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I’ve seen that in both my Vertical and in the new firmware for the S9PP. It seems to happen occasionally when relatively inactive but the watch seems to have trouble correcting to the accurate heart rate. I recall once it lasted close to 10 minutes before resolving. It was long enough to be reflected in the graph in the Suunto app.
I mentioned this in my feedback for the S9PP when the beta firmware came out. Hopefully the algorithm for 24/7 HR can be tweaked a little.
I know in past Gamins the 24/7 HR is a lower power sampling than during exercise. I haven’t followed as much with their new devices this last year. Maybe Suunto does something similar but its possible the new sensors are so power efficient that it isn’t necessary anymore…
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Is this an another duplicated post to be locked?
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Yes, I’ve noticed the same problem with the 9 Peak; it takes 10-13 minutes during a run for it to lock into the correct HR. It could be for all the reasons you mentioned. BUT I’ve NEVER had this problem with any Garmin watch.
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@CalRun48 Maybe because they use a different algorithm? I don’t know.
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OHR sensors are not accurate no matter the watch (Garmin, Suunto, Coros…) but it is true that in SV during the first minutes of each activity it is completely crazy. Before this SV I’ve had Fenix 7 & Fenix 6X - 6 and those OHR are much more precise.
Sometimes I think it would be better not to have an OHR at all.
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@Luis-Andés-Olmedo
i think it may never happen, OHR seems default “feature” now, but, i would also really consider a (suunto) watch, without OHR (to benefit from weight reduction, possibly something else in the watch due to more plae to put it, etc…), because, for me, OHR (with Suunto, i never try anything else) it still not reliable enough (at least with my wrists).
Nice to see HR when “needed”/wanted, but if each time one have to know rouhgly which HR to expect, it has no sense
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@Mff73 I partly agree. Some of the day-to-day features that Suunto replies the OHR on are all pretty crap at the moment. Sleep and Resources are waiting for Suunto’s own implementation above Firstbeat and I am not entirely convinced of the need for 24-7 HR monitoring. For sport purposes, OHR is more a convenience than superiority over chest HR straps. If a watch came to market without OHR with visible weight and aesthetic improvement, I might consider but I understand that the market is not where I am arguing for.
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@CalRun48 i dont had a run, was sitting in car and relax. When i train i only use chest strap
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I would also buy a watch with no OHR… it is useful for many features I do not really want/need/use and as it would leave space for more battery or less weight. The point is that there’s no alternative in the market today…
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@Luis-Andés-Olmedo yes cancel OHR or make it work 99% in warm weather. Dont care because I use belt in many cases. My OHR experience with Garmin / Coros is very good. They are ahead with OHR and they feel more robust. But I like Suunto watch most by far.
I would say my S9P is ok for me. Often very good but has to sit tight. And sometimes it is less robust.
I think the new sensor in S9PP and SV is just beginning and will be better over time with software I guess.
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@suuntastic @Luis-Andés-Olmedo do you think there will come more and better OHR measurement for the 9PP and the Vertical?!
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@GiPFELKiND No insides. Just my guess. But I think many products improve with software. Would not worry. Suunto watches are fantastic and unmatched!
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@suuntastic said in OHR Sensor often good BUT WHY SOMETIMES NOT:
@Luis-Andés-Olmedo yes cancel OHR or make it work 99% in warm weather. Dont care because I use belt in many cases. My OHR experience with Garmin / Coros is very good. They are ahead with OHR and they feel more robust. But I like Suunto watch most by far.
Exactly the same here. My experience with Garmin and Coros OHR is way better, but I like SUUNTO watch most and do not really care about HR (and when I do, I use the chest band)
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Today I noticed the first time with SV that the OHR measurement was obviously not correct. I had a trail run after work and I used the Poles when going upwards, and it was wet because of a little thunderstorm… when using the poles the Heart Rate shown was too low… I expected the heart rate should increase because it was steep and tiring, not decreasing.
Perhaps it was a combination of movement/muscle activity (using the Poles) and much water on the skin die to rainy conditions?
Next time, I will try to wear the wrist strap one point closer…
What do you think? -
@SuperFlo75 usually poles through off ohr
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@DMytro Ok thanks! I think I will have to use the chest strap in winter for nordic skiing
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@SuperFlo75 but I don’t know how competition performs in that regard (just mentioned to be objective).
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@DMytro I will try it
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No watch has ever really worked for HR for me, I think the Wahoo Elemnt Rival was the most accurate. Both my S9B and Vertical are hopeless, but because I like things to be as accurate as possible I always opt for a chest strap which I would recommend to anybody over using OHR
