ATP PC Energy System ATP PC Energy System

ATP PC Energy System

ATP PC Energy System Alternative Names: Type of Activities: Event Examples: Predominant: ATP CP, phosphagen, PC, CP, phosphocreatine, Alactacid Lifting, jumping, throwing, short sprints 50 m, shot put, long jump, tennis 0 -6 secs (approx. )

ATP PC Energy System Main Advantage: Main Disadvantage: Limiting Factor: Fuels Used: Byproducts: Number of ATP made: Used when: Located where: Rapid supply of energy (fast rate) Lasts short amount of time PC depletion ( 10 -20 secs. ) Phosphocreatine (PC or CP) (chemical fuel) Creatine, inorganic phosphate(Pi) <1 (low yield) High intensity, maximal efforts Myosin cross bridges of muscle

Phosphocreatine (PC) • PC is stored in the myosin cross bridges of muscles (along with ATP). • If a high intensity, maximal effort is required PC is called upon to be the substrate to provide this quick energy after the 1 or 2 contractions of ATP is depleted (and Adenosine Di Phosphate has been formed). • The PC molecule splits to become Creatine and Phosphate (byproducts), and the energy released is used to re-synthesize the ATP (from ADP).

Depletion Of PC • Phospho creatine stores are largely depleted within 10 -20 seconds.

Recovery • To replenish PC stores a passive (rest: lying down, standing still) recovery is fastest. Total inactivity reduces the resting energy requirements and frees oxygen for the recovery process. • A passive recovery will replenish – 50 -70% of PC within 30 seconds and – 100% of PC within 2 -3 minutes. • To develop greater PC stores an athlete should undertake strength/power training. • Taking supplements such as creatine monohydrate may also assist.