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How do I increase anerobic load when exercising?

I am having issues recording good Anerobic activity when doing work.outs.

I am using a Fenix 6X Pro

A recent example work out - 28mins indoor cycling - my max heart rate was 160bpm average 149. This excercise resulted in an Aerobic load of 3.7 and an Anerobic load of 02. (I am 52 years old and have a measured VO2Max of over 45.7 for this excercise activity)

I would have thought with a max heart and avg heart rate well above the 70% threshold, not to mention my effort was 9/10+

Should I have a higher Anerobic load?
How do I increase my anerobic load? I hav3 tried HIIT and Tabat - no increased anerobic load.

Any suggests appreciated.

0 2832642 over 1 year ago

Screen shots of activity.

0 trux over 1 year ago in reply to 2832642

You need an interval workout, with short anaerobic bursts at max effort. You cannot achieve any anaerobic effect with a long effort in Z5. You cannon sustain anaerobic metabolic mode for more than a few tens of seconds (typically up to ~20-30s, at top athletes perhaps a bit more), so if you manage to train in Z5 for 20 minutes, you are definitely not in anaerobic mode.

More details here: What Is the Training Effect Feature on My Garmin Device? | Garmin Customer Support

0 2832642 over 1 year ago in reply to trux

Thanks. I agree I need to flucuate my workout intensity and have done so with some effect(see below) however I thought that my zone 5 maintenance is by definition anerobic and should have a higher anerobic load.

0 trux over 1 year ago in reply to 2832642

2832642 said:
however I thought that my zone 5 maintenance is by definition anerobic

You'd be dead if you stayed 30 continuous minutes in anaeroby