FR 945 Series: Training effect calculation is wrong

Buongiorno, a mio modesto modo di vedere le cose devi settare bene le zone 2 zone 3 zona 4 perché 151 battiti corrisponde al 88% del 171 che hai impostato come soglia e di conseguenza ti dà come allenamento di tempo. Spero che sia giusto e ti sia stato di aiuto. Ciao 

There was already a topic on this. 

https://forums.garmin.com/sports-fitness/running-multisport/f/forerunner-945/335631/training-effect-broken-does-not-match-heart-rate-zones-anymore-with-firmware-12-10

All the exact same issue already for about two months now. No solution however.

Do you mean hitting the "green" zone for probably 1-2 seconds within 1,5 hours of running is enough to get a "tempo" status of training?!

Ridiculous! 

appears that that is exactly what it does. I've even had Threshold as a primary benefit where there was not even 2% of zone 3 touched. It's totally broken and very very annoying.

Do keep in mind that that Training effect label has nothing to do with your custom setup training zones, it compares your heart rate during run based on maximum and maybe also your vo2max... noticed your zones are def not the default skewing what you and others responding at quick glance might see/say... based on your max effort zone 5 of 171+... (point to a lower max HR of maybe 190? if using 90%+...)... but then other zones are quite high compared.  Did a quick test zone based on 190 max... gives a expected ranges of :

Nick, this doesn't make any sense. Results should be based on custom zones (people usually pay significant money for an advanced medical test to get their EXACT zones) - and naturally, it is expected that suggestions will be based on custom (e.g., real, medically tested) zones of a particular individual, instead default settings based on some dump and unprecise common formula.

yeah I get that, however the average person doesn't know F about zones or reads some articles and wants to have their zones presented a certain way so their graphs are pretty... but.... Firstbeat/Garmin needs a common program/platform.    Lactate threshold for instance is "typically" a percent of maximum HR... it is NOT however a % of some mythical training zone (which is also different per coach or training plan... *** some don't have the same # of zones!)

NickMN said:

Do keep in mind that that Training effect label has nothing to do with your custom setup training zones, it compares your heart rate during run based on maximum and maybe also your vo2max...

That's right! This is one of the things few Garmin users understand. The watch calculates all its metrics off a % of VO2 Max, NOT from the zones the user established. If the user has set up zones (standard or not) that are not aligned with the VO2 Max model the watch establishes, then everything will be skewed: training effect, training load, recovery, VO2 Max, suggestions and predictions, etc.

3112727 said:

instead default settings based on some dump and unprecise common formula.

In the world of life sciences, a standard error of 5% is excellent. The VO2 Max model average error is 5% (published by Firstbeat). The EPOC model (used for training load, effect, recovery) is around 10-15% (not published in % by Garmin, only in absolute values). So no dumb or unprecise model to be seen here.

3112727 said:

it is expected that suggestions will be based on custom (e.g., real, medically tested) zones

Nope, it is based on your VO2 Max model and the qualified HR/HRV/Movement/Pace data relationships that fed it.

If there is a disconnect between your lab or standard zones and your suggestions, predictions, it is most likely because of common user issues highlighted here:

forums.garmin.com/.../suggested-pace-far-too-high