Only nearly, Ray – I ran out of time. And today I did Tormalet. Both in endurance zone.
On your search for 20-minute segments, see this thread in the forum: Average/min/max information on selected part of workout. That will solve all your problems.
Tx for all the analysis and discussion guys. The decoupling calc uses the w/HR ratio not heart rate reserve:
powerHR[i] = watts60s[i] / hr[i]
decoupling[i] = (firstHalfRatio - powerHR[i]) * 100 / firstHalfRatio
I will have another look at how to better clean this data in a little while. I want to try get some HR/w data on the fitness page. That work is using the much more cleaned up and lag adjusted 1m data points used on the other decoupling charts.
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Now that you mention this, I have another idea 
It would be great to see how your efficiency compares to riders similar to you FTP wise… like how is the usual power/HR over different zones/watts/%FTP of people with similar fitness levels. Basically who has the best zone 2, or less cardiac drift at different watts/times.
I know this is a bit ahead, but just want it to throw it out before I forget.
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Its generally not good to try compare HR based metrics between people as there is a lot of variation. The are good for yourself over time.
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At the end of his presentation, this is what Seiler indicates that he wanted to do: to compare people and to compare performance over time by normalising HR to HR capacity or HR reserve and normalising Power to best 6-minute power [or FTZP].
Daniel_Hernandez: remember that this indicator really only works effectively for steady power sessions. A good 20 minutes to get the HR / power relation stabilised, and then the stable power session over which observations are being made. Effectively this means that the indicator could be used for endurance [Seiler’s idea], tempo or sweet spot continuous efforts.
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Hello,
what I understood from the video is that @ 50 % HRR you should be around half of your aerobic capabilities, so quite good to normalize this with 50 % of Max Aerobic Power/Power@VO2max hence the ratio around 1
@david thank you for your work, it is really awesome to witness this site develop the way it is going.
I was using and testing this new graph and today during my training, I did 2x20mnts sweetspot blocks
https://intervals.icu/activities/3384320395
As I was going into the second block, I was watching my HR climbing up slowly but surely, and thus I started to experiment with cadence, I was lowering my cadence and due to this, I was even able to drop my HR to couple points, you can see it between minute 45 and 46.
So, in light of this, I would like to suggest you add to the cardiac drift graph the field “cadence” since it does have an impact and can influence the drift.
Thank you
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yup I have noticed that too, but frankly if you want to compare one session to another you try to work in the same cadence to analyze HR or power/HR ratio, usually you work at your natural cadence for this kind of workout, don’t you ?
Yes I do like most people, however, I noticed that cadence is also impacted by fatigue level, usually at the start of the workout I do higher cadence than at the end when in hanging on for my dear life 
Ok, but IMHO Efficiency factor is mostly something useful to monitor endurance and easy training.
So if you are dropping your natural cadence on an endurance ride, you don’t need to have a complex cardiac drift graph or In/Ex S ratio to pinpoint where you are getting really fatigued on a long endurance bout, don’t you ?
Ok, so after a more detailed playing around, I made some interesting observations which are described here.
Interesting to know whether @david, you think this might influence the way the charts look in the future. Also thanks to @Michael_Webber for his input.
Looking forward to hearing your thought
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Kosio_Varbenov: your link takes me to Scribd, with a random list of books. Is this a mistake? If not, can you provide another link?
Thanks.
Its says your “doc has been removed” when I try follow the link. Keen to see what you have been up to!
You should send it to Stephen Seiler via Twitter !
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Thanks very much for all this work, Kosio. You’ve been thinking and working!
A couple of comments, that I hope will help.
First, Seiler defines his index as the ratio HRR/Prel. This is a non-negative number. You appear to have used David’s measurement of decoupling, which is different to Seiler’s. If your document is ever to receive the light of days outside this forum, then you need to note this, of change your calculations. [It won’t change any of your conclusions.]
Second, Seiler normalises his HRR/Prel values to the second 20 minute interval, not the first. Again, this is a matter of accuracy of reporting, not of substantive change to conclusions.
However, apart from these comments, I think that you have summarised well the conclusions that we reached in our analyses – though more elegantly than I: going downhill and pausing [or coasting up to traffic lights] are problems that really make this a tool for indoor trainers rather than the road.
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I added cadence to the chart. Uses the left hand axis which gets bigger than 100 if needed. Bit weird for HRR
Wow! I don’t have time to read it now but will be on it tm.
Anecdotal datas on myself
HR reserve 137, 50% HRR around 110-115
6 min power around 300W, when I ride on my turbo trainer at half of this I am roughly around 50% of my HRR hence the 1 ratio like in Seilers’ video