I should have added that how you set your HR zones in Settings is important. I have my Zone 4 starting at approx 90% of max HR and am happy to consider any minutes spent in Zones 4 or 5 as ‘hard’ (aka 20% in Seiler terms) in comparison to rides and workouts in Zone 2 (his 80%). I decide what kind of workout to do to achieve time spent working ‘hard’, differentiating between VO2 (Z5>) and Threshold (Z4) workouts according to time of year, how I feel, etc. Hope this helps.
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Please stop telling things that have never been said by Seiler as if it were the absolute truth.
Check this video at exactly 39min in.
It might even be surprising for a lot of people that already know some of Seiler’s work. Z2 is no longer the NOGO zone and you are left with only 2 session types: EASY or HARD. That’s it. Perfect system for any beginner, easy to follow and almost no risk of burning out, yet efficient.
I don’t care where this ‘Polarized Index’ thing is going but don’t make it look like it comes from Seiler because it absolutely isn’t what he’s saying.
All he ever mentioned regarding TIZ was when he was asked how it related to TIZ during an interview. The answer was: I don’t know exactly because I never looked at the statistics that way, but it’s probably more going to be like 90-10% or even lower HIT.
I don’t have any problem with the fact that you want to do things like you are doing them now. If it works for you, fine. But then just call it your own system and don’t make it look like it comes from a renowned researcher.
You are giving wrong information to people looking for a way to workout with an efficient system. Lots of them are beginners and they have no idea yet where to get correct information.
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Thanks for sharing that video, which I’ve watched several times but many may not have. I was responding to a request from Morten and I think I made it pretty clear (repeated use of ‘I’) that it’s a system which works for me, based on my understanding of multiple articles/ podcasts/ videos by Seiler and others. No claims to absolute truth by me.
Fair enough. It was only the part that I quoted that was upsetting me.
I don’t see any polarised index in my activity summery?
I had a look at your Thursday ride and it is there:
Is there a way to graph the PI for the whole week? Not the total PI of the activities for the week. I would think it is a better guide to know how close I was to “2” for the whole week, than have “18, 20 or 21” PI as a total for the week.
As the week summary in the activities page shows.
Thanks in advance
Unfortunately you can’t do that at the moment.
I’ve gotten a negative value for the weekly polarization index twice the last month. I thought 0 was the lowest value one gould get. Is this a bug?
It can be negative. The calculation includes Math.log10(t) where t is a number derived from the relative time in the 3 zones. If t is less than 1 then the result will be negative.
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Ok, thank you. I actually looked at the cited article to check how the value is calculated but since my math skills are rather poor (log10(t) 
) I couldn’t understand if a negative value is possible.
Hi,
Thanks for the feature, I am greatly appreciating the tool.
Although I am pushing forward the reflexion on what Jamie_Smith said.
In my understanding of the Teff & al 2019 paper, the Zone 2 is bound by the first lactate or ventlatory threshold LT1 (lower bound) and the second one LT2 (upper bound).
In the 5 zones model, the zone 4 aka “threshold” is splitted (not in half) by the second threshold (LT2), hence zone 4 should not be fully counted in zone 2 in the calculation index. Either it should be splitted, either it should fully be counted in zone 3.
Am I wrong or is there anything that prevent from doing that ? I would gladly ear from you.
Regards
Robin
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Intervals started with the classic 5 zone HR model and those zones are deeply ingrained. It is a lot of work to change that because numerous other metrics depend on it. Lots of code needs to be modified/rewritten. It will probably happen but there is no timing on it.
David acknowledged and is/was thinking on a completely customisable zone system for HR, power and pace, so that anyone could use their own preferred/personal number of custom zones.
For now, the combination of Z1 & Z2, Z3 & Z4 and Z5 & above is the closest match.
The way ´Polarised´ has evolved, is that less importance is given to Z2 and Z3. Anything above Z1 (LT1) is to be considered ´hard´.
I´ve never been a fan of the ´Polarisation index´ because ´hard´ work depends on the training period you´re in. SS during base is a hard session. But that´s just my opinion…
Question is, if you train ´polarised´, does that mean doing the same thing year round? Avoid Z2 and only do Z1 or Z3? That would contradict the race-specific training in lots of cases. Many races evolve in and around Z2…
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Hi,
Thanks for taking time to answer.
ok I understand.
I guess it is like every other metric, nithing is perfect.