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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.
Anaerobic Threshold (AT) was a term applied to the lactate inflection point, or the point at which the appearance of lactate in the blood accumulates faster that its rate of use.entilation increases at about the same rate as oxygen consumption up to about 50-70% of VO2max (depending on one's trained level). At this point (just beyond the ventilatory threshold) ventilation increases exponentially. Some researchers have identified two ventilatory thresholds.