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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.
1. The anaerobic threshold is the point where the work output results in the formation of lactate in the arterial blood. 2. The anaerobic threshold in a normal adult is between 1.5 and 2.5 liters of O2 per minute depending on fitness.