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All three systems are used. At the begining of the training the ATP-CP system is used for up to 10 seconds. A cross over process takes place and the body switches to the Lactic Acid system which is used from three to five minutes of exericse. After this point the body becomes suited to the pressure being placed on the body. therefore all energy can be produced aerobically. The aerobic system comes into play and becomes the predominant system.

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Q: What energy systems are used in a triathlon?
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