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Only in muscle tissue - phosphocreatine.

There is a high energy compound in your muscles called adenosinetriphosphate phosphocreatine (or ATP - PC). This is the first energy system that your body uses and is in use for about 10 seconds (like when you are sprinting, powerlifting, etc.). This compound will 'recharge' over time.

The two lower energy sytems used are:

The anaerobic or lactic acid system, which lasts approx. 2 minutes. This is used in exercises af about the duration and intensity of the 400m sprint.

And the aerobic system, which provides energy for long distance runs and continuous activity.

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14y ago

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