Sounds like slow would work. You can see the individual minute points for a ride on the ride power page.
I chose 1 minute after a little experimentation. Seemed long enough to not be too noisy but granular enough for the per activity decoupling charts. The data is precomputed and stored with each activity so its not easy to make this configurable.
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Could you add an option to smooth out the lines (best fit) and/or choose a power range? That would make it easier to read
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Hi @david, I love this chart to track my improved efficiency. However, it does not work well in the higher power ranges for me. I think this occurs for me because I do a lot of microinterval trainings, then the bucket of 1 minute is way too short since the heartrate is not stable enough. Any ideas?
Hmm not sure what to do about that. This really does need 1m buckets because HR takes a while to respond and so bad data can be tossed.
Hi David, would it be possible to configure the Y axis to be simply Heart Rate please?
The reason for the request is that I’ve changed my HR settings at some point in the past and so when trying to compare my Year on Year fitness I’m getting a skewed view. I don’t think my max HR has actually changed … just that I’ve altered the setting at some point.
Actual example - a point on the chart showing that I’m -14w this year to last. 248w in 2022 vs 234w in 2023 for 169bpm vs 166 bpm. So actually 3bpm slower in 2023 (presumably because I’ve lowered my max HR at some point). If I find 169bpm in 2023 on the chart the associated power is actually 247w … so just 1w lower.
It would therefore be really useful if there was a 3rd chart option of pure HR for those of us who’ve changed our HR settings in the period we’re trying to compare.
Thanks, Justin.
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I have just added that. Tx.
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Absolutely love that and thanks for the responsiveness David. Much appreciated. 
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Is there any way to change the colors for the years? It’s now kind of confusing as the same year shows in different colors in different charts. Thanks!
I think you can solve that by re-defining the time periods.
Leave all the charts in place, delete the years, and then add them again. Should be the same color then.
Hmmm, still the same.
I fixed that issue a little while ago. I think if you remove that “Intensity vs HR” chart and re-add it you should get the same colours on all the charts.
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It worked, thanks! 
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David, my HR vs Power chart filtered for “Virtual Rowing” is blank. Previous to a travel break in late September/early October 2023, I categorized my indoor erg rowing workouts as “Rowing” and that data successfully displayed on the graph.
Resuming my erg rowing in late October, data from my now categorized “Virtual Rowing” workouts do not show on the graph. Any thoughts?
You have “Virtual Rowing” as a separate sport in /settings. Rather delete the “Virtual Rowing” sport and add “Virtual Rowing” to the activity types for “Rowing”:
Then you should be able to see everything together.
I am 100% certain this is me being box as a rock of dumb, but can anyone explain how this works? I can’t see how w/hr is relevant without also having time in the equation. Is it for 1 min intervals?
These are ‘cleaned up’ chunks of 30sec where you plot the relation between heartrate and power.
If the plot moves further down right for different dat ranges, it means that you are fitter because you produce more power for a given % of LTHR (or maxHR).
It’s a nice feature where you can clearly see that there is a linear relationship for power to HR when within the aerobic range.
Here’s mine for Running activities over the past three seasons, showing that my running is definitely getting better this season.
Same for outdoor/indoor cycling:
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Thnx David for your response. My challenge with doing as you suggest is My erg rower (Ergatta WaterRower) has two different Power meters (S4 & SmartRow) that read Power differently for the same workout. Each allows me to share/compete in workouts with different user groups. My hope was to track my stats separately for each in intervals.icu, which is why I created ‘Virtual Rowing’ as a separate type. Any thoughts on an alternative solution?
BTW, I’ve run into an issue using ‘Virtual Rowing’ as a distinct activity when using TrainerRoad….my planned ‘Virtual Rowing’ workouts do not download into my TR WOD. Alex is working on a solution to that issue…
What do you use to measure your running power - Garmin watch I presume?
Coros Pace 2
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