Unable to determine lactate threshold

Your threshold looks to be around 178bpm as that is about when pace does not continue to rise with HR.
I suspect this time the test failed because not only did you not finish it but before you stopped there was a huge pace spike so the algorithm might think can you actually run at 6 min/mile pace or perhaps 5 min/mile pace. What was going on there?

philipshambrook Yes I did and also that one: https://forums.garmin.com/forum/into...hr-zones/page6
I believe that I followed all of the instructions. I trust my HRmax was set on a realistic value, one that I had seen on a hear rate monitor before. I was running steadily, going faster along with the course of the test, I was rested and generally in a good shape. Now I have down-set the HRmax to a value I've seen during last months but I believe that it may be too low as I rarely do intervals and other types of exercise that could trigger getting to HRmax.

Maybe I wasn't clear in my initial post - I am sorry.

timgrose
178 HR is a HR which I can only sometimes maintain for a 5-10k run. Generally I can maintain 170-175 and I would consider it my "race" HR - speaking only from personal experience and from "knowing my body".

the pace spike was my racing with a cyclist. During the final stages I was trying to get my HR up and I was unable to do that so I was trying do go "all in" so i went up with the pace. Maybe that was a mistake but I would have probably stopped either way because of the abdomen pain.
I can do about 6min/mile for a KM, maybe a bit less but I certainly couldn't sustain 5min/mil for a kilometer.

This was the second time I tried the threshold test and second time I failed.

A friend of mine did the test alongside me and he kinda failed as well as he got unrealisticly low value (168) and tempo (above 5min/km) despite his race HR is about 180 and hist PB for HM is 1:37.

My PBs for reference:
HM
https://connect.garmin.com/modern/activity/1799480591
10k
https://connect.garmin.com/modern/activity/1749058343
https://connect.garmin.com/modern/activity/1730637211
5k
https://connect.garmin.com/modern/activity/1773229106
However note that only 10k was a competition as I usually run those with my wife as her pacer being more interested in triathlon myself.


So summing up I REALLY REALLY want to detect the LTHR and I would like my next attempt to be fruitful. The fact that I have to be rested is kind of limiting and it interferes with my training plan, hence the questions.
The thing that I figured that i can change from above posts is HRmax, which I did.
I understood that I could also manually enter LTHR to "kickstart" garmin's detection, but won't that interfere with accuracy?
Thanks for your responses guys!

I have read through the thread and think I understand why I continue to get a failed measurement on the guided test. I am hoping someone on this thread is willing to look at my test file and tell me their thinking as to what my LTHR would be based on this test. I had a maxHR setting of 160. I was dying at the end of the test but I kept in the zones for each. There was a small incline and significant wind during my run that could have impacted the HR/pace relationship.

I am interpreting my LTHR at 145ish and pace at 8ish min/mile. I will say I know I could not maintain above 145 for very long. If I was going to have to adjust my guess, it would be on the lower end and not higher based on perceived effort.

https://connect.garmin.com/modern/activity/2724856651