My High Aerobic is Zero...

hkhead 7 days ago

Like others before, my High Aerobic is reading zero. This has happened before. I understand from other discussions on this site that it may be a settings issue, but I have Low Aerobic and Anaerobic scores, but zero for High Aerobic. There must be some action in High Aerobic to be able to transfer to Anaerobic, right?

Here's my ride from the weekend...

https://connect.garmin.com/app/activity/24500056018

I understand that it is registered as Base Training Effect, but zero High Aerobic? How come?

Top Replies

hkhead 6 days ago +2
trux 6 days ago in reply to 5217503 +1 verified

5217503 said:
I have exactly the same problem. With my last training

In your case, you've spent 90% of the activity time in low aeroby (HR Zones 0 to 3). Assuming your HR Zones are based on the true LTHR…
trux 5 days ago in reply to hkhead +1

hkhead said:
156bpm really is as high as my heart rate goes.

In that case, it looks like your HR Zones are quite off. If your Max HR is 156, then the HR Zone 5 should start at 148 bpm, and not at 139, as…

All Replies

0 e7andy 7 days ago

Post the HR zones for the activity. How much of the training was in the higher zones?

+1 hkhead 6 days ago

0 hkhead 6 days ago in reply to hkhead

Should be enough time in Zones 3 and 4 to register, right?

0 5217503 6 days ago in reply to hkhead

I have exactly the same problem. With my last training

0 e7andy 6 days ago in reply to hkhead

Can you get both high and low aerobic in the same activitiy or will everything always be one or the other? That would explaiin why you didn't get any high aerobic. For longer activities, zone 3 will probably be low aerobic. If the activity would be shorter time then it might be high...but it is a somewhat gray area in between high and low.

0 trux 6 days ago in reply to hkhead

hkhead said:
Should be enough time in Zones 3 and 4 to register, right?

The HR Zones are not really relevant, and especially if they are manually customized, or not based on accurate LTHR or Max HR values. HR Zones serve only to facilitate you revieing the activities, but they are in no way used for any calculation of performance metrics.

And seeing your HR Zone 5 starts at 139 bpm, it indeed looks like your HR Zones are quite a bit off (unless you are very old with the Max HR of ~145 bpm, or have a very low LTHR of 139 bpm). So first of all, check whether your Max HR and LTHR are correctly set. In doubts, do a field test (or a lab test), and enter the values manually. Then do a run where your HR stays close to the LTHR value, and you'll get enough of high aerobic load.

+1 trux 6 days ago in reply to 5217503

5217503 said:
I have exactly the same problem. With my last training

In your case, you've spent 90% of the activity time in low aeroby (HR Zones 0 to 3). Assuming your HR Zones are based on the true LTHR and/or Max HR, it is unsurprising that the Load Focus is 'low aerobic'

0 hkhead 5 days ago in reply to trux

Thanks for your feedback. I am 61 y.o. (the new 40), pretty fit after lifelong regular robust exercise, and take medication for my heart (which lowers my heartrate), so 156bpm really is as high as my heart rate goes. Will check my LTHR. To clarify the situation, I have also used Garmin products for many, many years and this has only ever happened once before, a couple of years ago.

0 trux 5 days ago in reply to hkhead

hkhead said:
156bpm really is as high as my heart rate goes.

In that case, it looks like your HR Zones are quite off. If your Max HR is 156, then the HR Zone 5 should start at 148 bpm, and not at 139, as shown on your screenshot.

0 hkhead 4 days ago in reply to trux

OK. Thanks. I am going to do this methodically, so have lowered my LTHR first, and will try some challenging rides and see what the results are. Will look at changing my heartrate zones if the issue remains the same.