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Both the basketballer and the road cyclist will use each of the three energy systems at different stages of their activities These three energy systems are the ATPPC energy system Lactic acid energy system and the aerobic energy system In both the basketballer and the endurance road cyclist certain energy systems are used more predominantly than others A basketballer will use the ATPPC energy system substantially more than the cyclist while the cyclist will use the aerobic energy system substantially more than the basketballer The ATPPC energy system is used by the body to produce ATP when there is insufficient time to break down glycogen in the presence of oxygen for the replenishment of ATP Residual supplies of ATP in the body are very limited and there is only enough for one explosive muscular contraction for example jumping to take a rebound in basketball An explosive movement causes the ATP molecule to split providing energy for muscular contraction Further muscular work relies on creatine phosphate breaking down to creatine and phosphate and releasing energy in the process The energy is used to drive free phosphate back to ADP so it can once again become a tripe phosphate Once reformed ATP can break down again and so the process goes on The amount of PC in muscles is limited After about 10-15 seconds of maximal work the supply is depleted and another energy system is activated These supplies will take two minutes to be restored Because the system is able to recover quickly it is very important for short explosive movements At maximal or near maximal effort fatigue is caused by the inability of the system to continually resynthesise ADP from CP because CP supplies are quickly exhausted This system is used for the majority of the time a basketballer is playing a game and is rarely used by an endurance road cyclist A basketballer may use this system to jump for the ball at the
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