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The lactate threshold (LT) (or lactate inflection point (LIP) or anaerobic threshold (AT)) is the exercise intensity at which lactate (more specifically, lactic acid) starts to accumulate in the blood stream.
In summary, the anaerobic threshold is commonly described by reference either to a blood lactate change (lactate anaerobic threshold, LAT) or to ventilatory gas exchange data, (ventilatory anaerobic threshold, VAT).