Old post I know. On my page the chart it selected but it doesn’t show up
It could help, if you show a screenshot of this activity.
Do you have power for this activity? Is an FTP value set for this activity?
Now I am confused, because I see the 30s power chart, and that is what the thread was about?!
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sorry…now I see it too…I mistakenly picked in something in the middle of this thread.
It’s that w/bal, the “matches” thing I don’t see…
You have to input a W’ in the settings 
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right…I’ll have to look up this in this forum about W’, meaning, definition, because I don’t know what value I should add there.
Easiest way to get in the ‘ballpark’ is to set a value around 10-12kj and then check some rides where you went to (almost) failure after several repeated efforts.
If the chart of W’ goes below zero, your value is set too low. If you know you went to failure and the chart still has several KJ left, it is set too high.
But understand that you need to have your FTP set quit accurately. FTP and W’ go together because W’ is the Power-reserve you have above FTP!
And don’t try to get it to an ‘exact’ value, W’ can be wildly different if checked on one single effort to failure or several repeated efforts where you fail on the last one.
That’s because the average recovery metrics don’t apply equally to everyone.
There’s also the Veloclinic plot (search the forum for more info) that was implemented as an Activity chart:
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ok! I’ll start from there - thank you all!
If you’ve done a maximal effort, eg. 3-min, look at your average power for the duration. Assume it was 300W for 3m.
A =
3m = 180s
300W * 180s =54,000 joules
B =
Assume FTP is 220W * 180s = 36,900 joules
C = A - B
= 54,000 - 36,900 = 17,100 joules.
W’ is usually in kilojoules, so it would be 17,1 kJ in this example.
Edit: replied before finishing my train of thought.
Then check your other durations above threshold, eg. 30s, 1m, 2m and up to about 5-6m. It’s all (average power multiplied by total seconds) - (FTP multiplied by total seconds). Look for range of joules as the value you can enter in the settings. Reanalyse your rides, then, as @MedTechCD mentions, look on the chart to see if it (W’) drops close to, or just below zero.
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fantastic!