How do I get heart rate drift for part of a workout?

Been interested in heart rate drift lately and gotten some good use out of the Cardio Drift app on Connect IQ. However, I'd like to get cardiac drift for everything but the first 15min of a run, since pace and HR tend to jump around a bit as I warm up to steady state pace. Is there a way to do this other than creating two files, one for the first 15min and one for everything else?

0 mrglt over 3 years ago

TrainingPeaks provides quite convenient way to get the figure for a selection, they call it Aerobic Decoupling and it can be based on power or (running) pace.

Though this is one of the features available only for subscribers.

https://help.trainingpeaks.com/hc/en-us/articles/204071724-Aerobic-Decoupling-Pw-Hr-and-Pa-HR-and-Efficiency-Factor-EF-

https://uphillathlete.com/heart-rate-drift/

It's probably implemented in other services too, like https://intervals.icu/ ( at first glance seems to be enabled only for cycling power, but I'm not actually using their service and might be wrong here)

0 stefangweichinger over 3 years ago

(subscribing) sounds as if you read about ADS and the heart rate drift test at uphillathlete.com or in their books?

0 5135968 over 3 years ago

Check out Intervals.icu

0 3046917 over 3 years ago in reply to mrglt

Thanks, yeah, I'm pretty reluctant to shell out $10/month just for that. I don't see pa:HR on intervals.icu, but good shout regardless. Runalyze does have free HR drift, but as far as I can tell it only looks at the whole file, there's no way to look at just part.

0 3046917 over 3 years ago in reply to stefangweichinger

Sure did

0 5135968 over 3 years ago in reply to 3046917

I've just had another look at Intervals.icu and it only does power / HR, not pace. I am not sure pace / HR is a good proxy for drift, purely because your HR will increase and pace decrease when running uphill, and vice versa downhill. Maybe Grade Adjusted Pace would be more useful.

As a workaround why not just start 3 seperate runs to break it down - if you configure a multi sport hotkey, a long press will start another running session after cooldown, and another long press after you finish your steady state part. Just look at the middle section in Runalyze.

0 3046917 over 3 years ago in reply to 5135968

"I am not sure pace / HR is a good proxy for drift"--for sure, I should add that this is on mostly-flat runs, I wasn't planning to bother with this at all for actually hilly courses.

"start 3 seperate runs to break it down"--yeah, I'll try this for now, thanks!

0 5135968 over 3 years ago in reply to 3046917

3046917 said:
"start 3 seperate runs to break it down"--yeah, I'll try this for now, thanks!

I do similar with online rides.

For HR drift, I actually prefer to look at time rather than pace for running - I find I can run up to about 70 to 80 minutes with pretty much no drift, but after 90 minutes I really start drifting upwards. This tends to correlate well with Performance Condition I find as well (I start going negative)

0 3046917 over 3 years ago in reply to 5135968

Interesting about performance condition. Yeah, so as I understand it

1) any pace will eventually exhibit HR drift if you keep at it long enough

2) faster paces will exhibit greater drift

3) we can formalize the idea of an "indefinitely sustainable" pace by picking a nice round heart rate drift number to not exceed (some % drift over a set amount of time at pace). I picked this up from the Uphill Athlete guys, as mentioned upthread, and they use 5% in an hour. See https://uphillathlete.com/heart-rate-drift/ for a full description of how they use it.

3a) hopefully we validate that drift threshold by triangulating with other measures (MAF HR, %max HR, %max HRR, nose breathing, breathing rhythm, RPE easy, a bit slower than marathon pace or maybe right around marathon pace in less well-trained athletes, blood lactate, respiratory quotient, power metrics for cyclists and rowers, etc.).

Apologies if I'm telling you something you already know, but it sounds like you're using drift metrics a little bit differently than I am and I wanted to clarify.

0 mrglt over 3 years ago in reply to 3046917

If it's mostly for test runs then cropping those fit-files ( https://www.fitfiletools.com/#/remover#view ) before loading into Runalyze might work too. Both sites support drag and drop file import saving you few clicks. From my drift test runs I learned that for me personally it's quite hard to predict when HR stabilizes after warmup, so being able to select a portion from a run was quite handy.