RSS in real time in QZ while using an Stryd Pod

[davidfernandezt]

As spoken in FB : Talking about Stryd + QZ , Another thing that Qz might do with Stryd is to calculate the RSS in real time, that would be a huge difference and improvement compared with Stryd alone !

Roberto Viola the formula it’s a bit of mistery by the people of Stryd . I by trial an error + a general formula
got the following which in my case gives really quite close numbers of that generated by power Center at the end of the run : RSSAVG = ( ( ( ( ( MIN x 60 ) x NP x ( NP ÷ CP ) ) ÷ ( CP x 3600 ) x 100 ) x .6139 ) + ( ( ( MIN x 60 ) x NP x ( NP ÷ CP ) ) ÷ ( CP x 3600 ) x 100 ) ) ÷ 2

Despite the formula ask for Normdlized power , I use the average power . BTW the 0.6139 I just got it by trial an error in order to match power center .

[cagnulein]

alomost done
similar to this #516

[cagnulein]

@davidfernandezt code implemented! do you want to see it in a separate tile? if so, do you think that the same algorithm could be used also for bike replacing the CP with the FTP value?

[davidfernandezt]

A new tile would be excellent ! I don’t think that just changing CP to FTP would be functional to bike since the difference between TSS vs RSS vs rTSS , herewith something about it : https://help.trainingpeaks.com/hc/en-us/articles/204071944-Training-Stress-Scores-TSS-Explained

[cagnulein]

@davidfernandezt i added the tile but i guess there is something that i'm missing; how do you calculate the NP? Usually the NP is calculated with the last 30s average values, but this formula doesn't have sense if i'm calculating the RSS every 1 minute for example. What do you think?

[davidfernandezt]

I have noticed that despite the formula said Normalized power , if I directly use the average power it gives almost the same number than the one from Stryd power center , since only when several differences in power output are registered will result in a very different NP vs AVG power , and in running would be quite unusual , while in bike could be easily or more commonly found . I guess that it would generate too much data since it would need to register the average every 30secs (well really the moving average at 30secs intervals ) and at the save time its fourth power and the average of both . At the end in my case it would just make a difference of around 1 or 2 rss in 90minutes , that in real time wouldn’t make any real impact . I have always thought that since running power analysis started from the bike experience, then many calculations aren’t an exact fit or even universally accepted, therefore some are more “proprietary “ calculations of a brand like Stryd

[davidfernandezt]

Forgot to add a link about NP that might be useful
https://join.cc/cycling-tips/why-do-you-use-np-for-your-training/#:~:text=To%20calculate%20the%20NP%20you,root%20to%20the%20fourth%20power.

[cagnulein]

ok so you are suggesting to use directly the AVG, right?

[davidfernandezt]

In my case I havent noticed any real difference in using the NP vs avg for running , I would suggest to use the average power , but perhaps I am too slow to generate a big difference in power output constantly in say 90mins ! 😂

[cagnulein]

ahahah ok let's go in this way so! i'm building now. are you on android or ios?

[davidfernandezt]

Both, sometimes I use an iPhone and sometimes a Samsung tablet , it really depends upon where I am training

[cagnulein]

ok if you want to give it a try on android: https://github.com/cagnulein/qdomyos-zwift/actions/runs/8536942795

i added 2 thing:

• a new setting in the general settings to set your CP
• a new setting in the tile settings to enable the RSS (disabled by default)

Google is very slow in these days, reviewing the app on the store, even the beta ones. For this reason, in order to check right now if the patch that I did is right, you can use the android build in the link (check at the bottom of the page in about 1 hour). In order to test it you need first to remove the current QZ version on your phone, install the one that you downloaded.
This version is a 15 minutes trial (you can restart it as many times as you want) and I can unlock it if you want, send me an email to [email protected] mentioning this ticket and that you are on android.
Let me know if you have any questions

[davidfernandezt]

Thanks Roberto , unfortunately right now I am out of home , without both of my devices with QZ (Android /ios but as soon as returning back I happily would test

[cagnulein]

no problem, I will test myself hopefully today