Suunto ZoneSense
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@Liviu-Nastasa
I guess it’s normal (or maybe not unusual) to have some scattered values at the beginning, and that’s the main reason for calibration.As you can see, despite the mess
, there are some good sets of readings that are (very probably) used to calibrate ZS baseline
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@Theo-Lakerveld looks great!
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@Inge-Nallsson @sartoric Thank you! Then I will first work on the quality, the belt is already washed. Then I will try it again with Zonesense and hope for the best
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@Theo-Lakerveld from your screenshot it’s also nicely visible that Zonesense tracks the changes caused by rising your HR with some delay, due to the time that is needed for them to effect your system and why it won’t work for fast paced intervals accordingly.
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@Liviu-Nastasa As @sartoric says, it is not unusual to see larger swings in the heart rate variability at the beginning of an exercise, and even getting scattered readings there, and from the plain text and videos Suunto have published (I’ve not read the scientific papers) they disregard the whole first 10 minutes, waiting for the body to reach a balance (homeostasis) within its systems.
As for a baseline, and please correct me if I’m wrong (Suunto people), there already is a general one established through the first couple of ZS registered activities. How much of that is kept or adjusted by consecutive recordings I’ve not seen any mention of. But the day-by-day difference to the longterm baseline should not start to be looked at until after the discarded first 10 minutes.
I will try to inform myself better by reading those published science papers, but there will always be a ‘black box’ of implementation from, in this case, Suunto.
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@Theo-Lakerveld
Hi Theo
I followed @Brad_Olwin advise this weekend on a 2hr trail run with a lot of climbs. I noticed a similar trend to yiur data in that the DDFA score increased to a max at the start of a climb (a drop on the graph) before dropping and going negative after the summit.Anyone know why this happens? You can see a clear lag between DDFA and HR which I can understand but why does your DDFA improve when HR increases initially? Just curious !
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@Oxhill_Runner DDFA is not measuring HR. There is a lot of information about this from Suunto.
https://youtu.be/bD3O4BZ9vIc?si=JXKmquFxU2TXahXx -
@Brad_Olwin
Hi BradI get that it’s measuring HRV, something I’ve been tracking with HRV4Traing for a few years now too.
I was curious why the DDFA score improves initially as intensity (and so HR) increases before decreasing and ZS moves out of aerobic towards anaerobic zones.
Seems a bit counter intuitive that’s all ! Maybe a question for a cardiologist
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@Oxhill_Runner you are only seeing one example and when HR increases ZS will not always increase, more complicated. That is why I gave you the video link. ZS does not measure HRV as the app you use. What you are asking is not necessarily occurring. However, there is a lag between ZS and HR.
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@Brad_Olwin @Oxhill_Runner, I’ve seen that behavior consistently with ZS about having a big drop to positive value (green) at the start of a interval.
From what I’ve been reading, it’s all about a reaction reflected on our HRV when we introduce a big change in intensity, our HRV changes and kind of prepares for what is coming.
This can also be seen when you’re about to start a downhill and change intensity.
Point being, those big drops to green are related to times where are intensity shifts by a lot.
This is from a 3x15 mins @ threshold:
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@herlas Yet at every drop you have a substantive decrease in HR. I think if steady HR and progressively increasing these will not occur.
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To me, it looks like the ZoneSense reading follows lactate build up. I’m going to test this with the lactate measurement protocol from the trainers in the Norwegian triathlon federation (the people behind Blumenfelt and Iden). I have a lactate level blood test device. If the test result follow each other, this could be a really revolutionary functionality. I’ll keep you posted.
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@Theo-Lakerveld have you looked at the webinar videos put up by Suunto on their YouTube channel? What you’re mentioning on ZS and lactate thresholds was already stated as a finding, ZS does follows that and Monicardi who came up with ZS, said ZS is +/- 5 bpms to heart rate in a lactate threshold test.
Nothing really to demostrate here anymore, but give it a try for yourself
