Energy Systems.pdf - Energy Systems ATP-PC Glycolytic and Oxidative The first thing to remember is that ANY muscle contraction/force exertion is due to

Energy Systems.pdf - Energy Systems ATP-PC Glycolytic and...

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Energy Systems: ATP-PC, Glycolytic, and Oxidative The first thing to remember is that ANY muscle contraction/force exertion is due to a molecule called adenosine triphosphate (ATP). When an ATP molecule is combined with water the last of three phosphate groups splits apart and produces energy. This breakdown of ATP for muscle contraction results in adenosine diphosphate (ADP). The limited stores of ATP must be replenished for work to continue; so chemical reactions add a phosphate group back to ADP to make ATP. The Three Energy Systems Conventionally, there are three energy systems that produce ATP: ATP-PC (high power, short duration), glycolytic (moderate power/short duration), and oxidative (low power/long duration). All are available and “turn on” at the outset of any activity. What dictates which one (or two) is relied upon the most is the effort required. The ATP-PC Energy System High Power/Short Duration ATP and phosphocreatine (PC) compose the ATP-PC system, also sometimes called the Phosphogen system. It is immediate and functions without oxygen. It allows for up to approximately 12 seconds (+ or -) of maximum effort. During the first few seconds of any activity, stored ATP supplies the energy. For a few more seconds beyond that, PC cushions the decline of ATP until there is a shift to another energy system.It is estimated the ATP-PC system can create energy at approximately 36 calories minute.
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