Runs listed as tempo/ high aerobic

Was the indoor activity a run or something else, as the training benefit is also based on the activity type.

Training Effect | Garmin Technology

It was just cardio non gps. It doesn’t make sense that on my run my heart rate was low throughout and gets high aerobic yet my indoor cardio it was fluctuating going low to pretty high throughout yet only got base low aerobic

cardio is naturally more slanted towards high aerobic and anaerobic based on the nature of cardio.

This explanation is more detailed, and while focusses a bit more on difference between aerobic and anaerobic, it should still provide enough detail for the difference: https://support.garmin.com/en-GB/?faq=Vi2undejXR5Mmq662o4lO9

Actually I logged it as circuit not cardio, apologies. It doesn’t make sense. The only thing it judges my workout on is how hard my heart is working. I’ve done similar workouts thousands of times and if I go above zone 2 or 3 often, it gets logged high aerobic yet yesterday it put it low/base
Also if I run less than 135 bpm average it ALWAYS logs it base yet last few days it’s putting it tempo and high aerobic when it’s anything but. Must be a glitch since new software. It’s been fine for 7 months until now

7177773 said:

It’s been fine for 7 months until now

Software has not been updated for the past two or three months since 8.37 was released so something else must have changed.

Similar thing happens to me. A brief period in the upper heart rate zone changes the run type. 

The labels of a workout ("recovery", "base", "tempo", "threshold", "Vo2Max") are uniquely mapped to certain configuration of training effect levels across the "aerobic" and the "anearobic" categories.

Firstbeat Analytics

The calculation of the training effect is based on the EPOC evaluation, your training history, fitness status and the patterns of your workout (interval vs steady state laps).

Aerobic Training Effect | Garmin Technology

Physiological Measurements | Garmin Technology

So it is not easy to guess the training effect of a particular run or activity. In addition, some spurious data from HR sensors can distort the effect quite a bit. For example, yesterday, a strength training was categorized as anaerobic (!) because I was not wearing a chest strap and the wrist-based HR sensor went crazy high during an exercise.

So I would not torture myself about individual data points and look at the evolution over time of your training acute load (needs to be in range), focus (needs to be balanced), VO2 max (hopefully improving) and race predictions (matching your capabilities)

Thanks...while not adding any real extra detail, the link for Firstbeat explanation is appreciated

Will have to take a more detailed look on their website.