lactic acid is used mostly 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 itcomes from the breakdown of Adenosine Triphosphate (ATP).There are three energy systems that rregains energy they are:ATP-PC, lactic acid and Aerobic energy systems.Latic Acid provides very quick supply of ATP for intense short burtst of energy it usally lasts up 30-60 secs however it can last up to 3 mins.The duration depends on the intensity of the activity The leless the intense the activity the longer it will last NEED TO SAY ABOUT FATIGUE
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