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* Resting HR drops after 3 months with no further improvement thereafter<ref name="Scharhag-Rosenberger-2009"/>
* HR at a given submaximal intensity drops within 3 months<ref name="Scharhag-Rosenberger-2009"/>
= Adaptations and Endurance Running=[[File:Model of endurance running.jpg|none|thumb|500px|A model of how three adaptations impact endurance performance<ref name="Midgley-2007"/>.]]This flowchart shows that while [[VO2max|V̇O<sub>2</sub>max]] is a key determinant of performance, it interacts with other factors. Lactate threshold defines what percentage of [[VO2max|V̇O<sub>2</sub>max]] can be sustained, which defines the energy available (ATP re-synthesis). Running economy then defines how well this energy can be translated into forward motion.
=References=
<references>
<ref name="Murias-2010">{{Cite journal | last1 = Murias | first1 = JM. | last2 = Kowalchuk | first2 = JM. | last3 = Paterson | first3 = DH. | title = Time course and mechanisms of adaptations in cardiorespiratory fitness with endurance training in older and young men. | journal = J Appl Physiol | volume = 108 | issue = 3 | pages = 621-7 | month = Mar | year = 2010 | doi = 10.1152/japplphysiol.01152.2009 | PMID = 20056848 }}</ref>
<ref name="Scharhag-Rosenberger-2009">{{Cite journal | last1 = Scharhag-Rosenberger | first1 = F. | last2 = Meyer | first2 = T. | last3 = Walitzek | first3 = S. | last4 = Kindermann | first4 = W. | title = Time course of changes in endurance capacity: a 1-yr training study. | journal = Med Sci Sports Exerc | volume = 41 | issue = 5 | pages = 1130-7 | month = May | year = 2009 | doi = 10.1249/MSS.0b013e3181935a11 | PMID = 19346973 }}</ref>
<ref name="Midgley-2007"> {{Cite journal | last1 = Midgley | first1 = AW. | last2 = McNaughton | first2 = LR. | last3 = Jones | first3 = AM. | title = Training to enhance the physiological determinants of long-distance running performance: can valid recommendations be given to runners and coaches based on current scientific knowledge? | journal = Sports Med | volume = 37 | issue = 10 | pages = 857-80 | month = | year = 2007 | doi = | PMID = 17887811 }}</ref>
</references>