HR targets on smart trainer (dropping power between interval changes)

i have had an interesting change in the way the app is running HR target intervals. previously, if the app was switching from an ERG interval to an HR+ interval, it would do so seamlessly, with no initial change in power output, then adjusting for HR target as needed.

Now, same workouts, when it switches from ERG interval to HR+ the power drops out to almost zero, regardless of the previous interval power or the new HR target. look at these screenshots. same workout, one before trainerday update and one after. notice the power drops after every 1minute erg recovery interval.

Strange. What trainer do you have?

kickr core. it has only started doing this as of the last update. i am going to try to rebuild the workout in the new editor and see if that fixes it and report back

Send me link to your workout. Actually as I think about this, I can think of the possible new issue. I will have to review later in the week.

will do. im new to sharing workouts. do i make it public, then just paste the link here?

No just leave it private and share the link is fine.

I clicked the link and was surprised by the stress and intensity numbers for that workout

Screenshot 2026-05-11 211806

I think it wants the zeros for power populated.

Before

After

Dave

That shouldn’t effect it in hr+ mode. I use this workout regularly with no issues

It doesnt need the power populated for HR+ intervals. O ly if you want the estimated time in zone to be more accurate. I have about 20 different workouts with HR+ intervals some with power filled in some without and they all work the same. I made this workout with the old editor and now it looks like it automatically turned it into reps/sets so that could be the issue.

Haha I think they are skewed because i have my threshold HR set to 140 in the app. So it thinks im riding above threshold, but in reality 150bpm is my Z2

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I will check this when I am home from vacation in 2 days. I have an idea what the problem might be.

You have too many ideas. Relax and enjoy vacation!

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Ok just commenting here that I am going to start working on this hopefully tomorrow. But new version should be coming tomorrow and does not have this fix yet.

FWIW i modified the workout without the 8x interval and just put each individual interval in and it worked without the dropping power issue. now granted i also have watt ranges so graphically it looks like what the ride should be, so this test cant really rule anything out due to changing too many variables in one shot, but its something haha.

Yes the zeros were part of the problem but the underlying problem is I believe it first send a base target of 20 or 40% of FTP based on your settings and 2 seconds later sends the actual target.