US Marathons Races Directory and Schedule. Running app and fitness community. Find Out How Fit You Are at Runner. Over years of running, inefficiencies can creep into your stride.
Often, an injury changes the way you run. Or maybe one leg has become stronger than the other for some reason, or you've started swinging your arms across your chest too much. Training Calculator for Runners: Runner. Lactic Acid. The expression "lactic acid" is used most commonly by athletes to describe the intense pain felt during exhaustive exercise, especially in events like the 400 metres and 800 metres. When energy is required to perform exercise, it is supplied from the breakdown of Adenosine Triphosphate (ATP). The body has a limited store of about 85 grms of ATP and would use it up very quickly if we did not have ways of resynthesising it. There are three systems that produce energy to resynthesise ATP: ATP-PC, lactic acid and aerobic. The lactic acid system is capable of releasing energy to resynthesise ATP without the involvement of oxygen and is called anaerobic glycolysis.
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