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Exact pre-conditions for determination of running lactate threshold during an activity?

Hey folks,

Can somebody tell me under which exact pre-conditions during an activity the running lactate threshold is determined?

I had some additional outdoor running activities (with various intensity e.g.VO2 max) since the last shown measurement on 19th of December (running three times a week actually) and I am wearing a Garmin chest strap all the time?

For example, today I had a suggested VO2max session with 74% of my HR in zones 4 and 5 but there is no updated measurement on the lactate threshold for quite a while?

Thanks in advance.