Incorrect training effect - specially anaerobic effect in running workout

Take a look at the heart rate recorded in the activity because 10 sec sprints are hard for the wrist HR to record. If the watch did not detect HR spike into zone 5 it assumes no anaerobic effect. I am afraid the only way to record such short intervals is HRM strap. I do minimaly 250m intervals for the samo reason.

Thanks, but I am only following the daily training suggestion provided by the watch.

There is no requirement that your HR go to zone 5 for an anaerobic effect. Anaerobic TE is primarily looking at the rate of increase in HR, rather than time in zone.

While I do get Anaerobic TE from short sprints with the wrist HR, I do agree that that a chest strap will pick up changes in HR more quickly.

Rabiraj said:

I was given 10s sprints and I ran at suggested pace,

For 10s sprints, just run HARD and go by feel. If you are holding your watch steady and trying to adjust your sprint based on GPS pace to meet the target pace, then you are doing sprints wrong.

(Apologies if you meant that you are only looking at pace afterwards, but I just thought I would mention this).

Difficult to tell when can't see any of your data from the activity - but perhaps read this support article around anaerobic training effect - may provide some understanding why your activity didn't provide what you expected: https://discover.garmin.com/en-GB/performance-data/running/#anaerobic-training-effect

To really get good anaerobic you are much better off doing HIIT and or Cardio workouts as they much more target anaerobic. Running tends to favour low /high aerobic much more.

The problem is that I am following the workout suggestions given by the watch, and it is giving me same workout as it thinks I have not done them properly.

Similar thing here - and makes no difference if an optical or is chest sensor is used as I did it with both 

I think the issue is that short sprints do not raise HR enough - I think Garmin needs to make the sprints longer in order to elevate HR enough

Intention:

Actual:

HR for both activities on consequtive days are below

With Polar Verity Sense

With HRM Pro

This is frustrating; I have it too.  Did a regular 30 minute workout at the gym.  Then I did sprints on the treadmill for about 10 minutes - pretty intense sprints! Got my HR up to 170 a few times.  The training effect was 3 aerobic but 0 anaerobic.  Hmm…

Hugely frustrating. I did fairly intense workout with 15 mins in zone 4 & 5 and 20 mins in zone 3, 16 mins in zone 2 yet it was BASE/low aerobic???

this was despite training effect also saying it was 3.3 aerobic, which is fine but 2.3 anaerobic?

Base/ low aerobic workouts shouldn’t have any length of time in zone 4&5 or be anaerobic yet here we are again. It was fixed for a while but now it’s happening again

I did a very similar daily suggested workout a few weeks ago and got a 2.5 anaerobic training effect, exactly as predicted. Are you sure that you're hitting the target pace for every sprint step? Are you actually resting between sprints so that your heart rate recovers?

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