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* Lactate Threshold will vary by sport, probably based on the mass of muscle engaged<ref name="Beneke-1996"/>, or because the inactive muscles consume more lactate as the concentration rises<ref name="Orok-1989"/>. MLSS may also vary with environmental conditions, with a lower lactate levels at MLSS in hotter conditions<ref name="de Barros-2011"/>.
=Aerobic Threshold=
There is a related concept called "Aerobic Threshold" that is generally used to mean the exercise intensity at which Lactate levels rise above resting baselines<ref name="Faude-2009"/>. (Unfortunately, the term "Lactate Threshold" is sometimes used instead of "Aerobic Threshold"<ref name="Yoshida-1984"/>.) This threshold is believed to be the upper limit of nearly exclusive use of aerobic metabolism that can be sustained for many hours. Intensities just above the aerobic threshold can be maintained for prolonged periods (~4 hours)<ref name="Meyer-2003"/>. This aerobic threshold can be hard to determine in untrained subjects as it occurs at very low intensities<ref name="Seiler-2010"/>. Unfortunately, The aerobic threshold is approximately the term same as [[FatMax]]<ref name="Lactate Thresholda585" is sometimes />, and can be used to mean this point where lactate rises above resting levelsdefine the intensity for easy training, often called "Zone 2" in the five zone model. [[File:Three Phase Model of Exercise.jpg|center|thumb|600px|A three phase (zone) model of exercise intensity<ref name="k156"/><ref name="Yoshida-1984e211"/>.]]
=References=
<references>
<ref name="Bergman-1999">BC. Bergman, EE. Wolfel, GE. Butterfield, GD. Lopaschuk, GA. Casazza, MA. Horning, GA. Brooks, Active muscle and whole body lactate kinetics after endurance training in men., J Appl Physiol (1985), volume 87, issue 5, pages 1684-96, Nov 1999, PMID [http://www.ncbi.nlm.nih.gov/pubmed/10562610 10562610]</ref>
<ref name="JonesBurnley2019">Andrew M. Jones, Mark Burnley, Matthew I. Black, David C. Poole, Anni Vanhatalo, The maximal metabolic steady state: redefining the 'gold standard', Physiological Reports, volume 7, issue 10, 2019, pages e14098, ISSN [http://www.worldcat.org/issn/2051-817X 2051-817X], doi [http://dx.doi.org/10.14814/phy2.14098 10.14814/phy2.14098]</ref>
<ref name="a585">Carlo Ferri Marini, Philippe Tadger, Isaac Armando Chávez-Guevara, Elizabeth Tipton, Marco Meucci, Zoran Nikolovski, Francisco Jose Amaro-Gahete, Ratko Peric, Factors Determining the Agreement between Aerobic Threshold and Point of Maximal Fat Oxidation: Follow-Up on a Systematic Review and Meta-Analysis on Association, International Journal of Environmental Research and Public Health, publisher MDPI AG, volume 20, issue 1, date 2022-12-27, ISSN [http://www.worldcat.org/issn/1660-4601 1660-4601], doi [http://dx.doi.org/10.3390/ijerph20010453 10.3390/ijerph20010453], free !!doi-access!!, page 453</ref>
<ref name="k156">Ronald K. Binder, Manfred Wonisch, Ugo Corra, Alain Cohen-Solal, Luc Vanhees, Hugo Saner, Jean-Paul Schmid, Methodological approach to the first and second lactate threshold in incremental cardiopulmonary exercise testing, European Journal of Cardiovascular Prevention & Rehabilitation, publisher Oxford University Press (OUP), volume 15, issue 6, 2008, ISSN [http://www.worldcat.org/issn/1741-8267 1741-8267], doi [http://dx.doi.org/10.1097/hjr.0b013e328304fed4 10.1097/hjr.0b013e328304fed4], free !!doi-access!!, pages 726–734</ref>
<ref name="e211">James S. Skinner, Thomas H. Mclellan, The Transition from Aerobic to Anaerobic Metabolism, Research Quarterly for Exercise and Sport, publisher Informa UK Limited, volume 51, issue 1, 1980, ISSN [http://www.worldcat.org/issn/0270-1367 0270-1367], doi [http://dx.doi.org/10.1080/02701367.1980.10609285 10.1080/02701367.1980.10609285], pages 234–248</ref>
</references>
