What is the approximate blood lactate level, in mmol, at anaerobic threshold?

The anaerobic threshold refers to the point during intense exercise at which the body transitions from predominantly aerobic energy production to anaerobic energy production. At this point, the body begins to accumulate lactate in the blood faster than it can be removed, leading to an increase in blood lactate levels.

The approximate blood lactate level at the anaerobic threshold is typically around 4 mmol/L. This level indicates that while some lactate is being produced, the body's buffering systems and removal mechanisms are still somewhat efficient. As exercise intensity continues to increase beyond this threshold, lactate production surpasses the body's ability to clear it, resulting in further increases in blood lactate levels.

Levels below this threshold, such as 2 mmol/L, would indicate that the body is still operating primarily in the aerobic zone where lactate accumulation is minimal. Blood lactate levels significantly higher than 4 mmol/L, like 6 or 8 mmol/L, would indicate a more advanced stage of anaerobic exercise where the body is experiencing increased lactate buildup, reflecting a greater reliance on anaerobic pathways for energy. Thus, the choice of 4 mmol/L accurately represents the anaerobic threshold in healthy individuals during moderate to high-intensity exercise.