There isn't a single number the way there is for peak aerobic performance, but there are several things that do matter. The more work you can generate while keeping lactate below two millimole seems to be empirically the place at which you can maintain a steady state where lactate doesn't net begin to accumulate. Then we look at other things like glucose disposal. How much insulin do you require to put it into your muscle and how high does your glucose get before you put it away? Other markers like triglycerides, transaminases, inflammatory markers also factor into it.

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