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The Lactic Acid System

Site of Reaction ­ Sarcoplasm
Presence of O2 ­ None
Fuel Used ­ Carbohydrates, Glucose, Glycogen
Active Enzyme ­ Phosphofructokinase, Glycogen Phosphorylase, Lactate
Speed of Reaction ­ Fast
Threshold ­ 12 Secs ­ 2 Mins (Depending on Intensity and Fitness)
Biproducts ­ Lactic Acid, Pyruvic…

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The Glycogen molecules are broken down in the same way except the Gycogen is
broken down by the Glycogen Phosphorylase into Glucose ­ 6 ­ Phosphate.
Gycogen then follows the same route as Glucose.

Practical Application

The 400m race is a good example of the possible effects of using the…


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