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Lactate Threshold is important as it is an excellent good predictor of race performance<ref name="Billat-1996"/><ref name="Palmer-1999"/><ref name="Baldari-2000"/><ref name="Jones-2000"/>. Lactate Threshold can be thought of as the percentage of VO2max that can be maintained for a protracted time<ref name="Costill-1973"/>, though it's not clear what the limiting factor is for exercise above the Lactate Threshold<ref name="Baron-2008"/>.
It is common to plot exercise intensity against lactate level to produce a blood lactate curve similar to the one below, showing an exponential rise in lactate level with intensity. It's generally accepted that a shift of the curve to the right indicates an improved athletic performance<ref name="Bosquet-2002"/><ref name="Yoshida-1990"/>, and training can improve performance because of this shift without a change in aerobic capacity ([[VO2max|V̇O<sub>2</sub>max]])<ref name="Acevedo-1989"/>. There is some limited evidence from radio-isotope studies in animals that a benefit of endurance training may be in Lactate clearance<ref name="Donovan-1983"/>. Note that above the Lactate Threshold the Lactate level is not at a steady state, but rises even though the intensity remains constant, so the typical curve that is shown is rather misleading. [[File:
Blood Lactate Curve. jpg|none|thumb|500px|A typically blood lactate curve with lactate level plotted against intensity.]]
=Lactate Threshold Training =
''Main article: [[Tempo Runs]]''