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Oh I know that! That's why I wanted to mention that the test was cycling. Haven't had a running lactate threshold test just yet. My triathlete friends tell me that transitioning from swim to bike can also spike it as your body adjust to suddenly being upright. I can also pinpoint on my HR graph the exact moment where my body was just like "nah, had enough" (below).
I'd say about 18k of holding this pace was on merit, the rest was just stubbornness.
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My running HR, both threshold & maximum, is significantly higher than my cycling HR, even if I'm staying out of the saddle - being upright plays a big part, and larger limb movements have more of a pumping effect too.
Good work though!