Energy Systems

Basic facts



Where?                          Muscle Sarcoplasm.

Type?                             Anaerobic.

Fuel?                              PC.

Enzymes?                     ATPase/Creatine Kinase.

Yield?                             1ATP

Intensity/Duration?         Very High/>10s

By Products?                 Phosphate/Creatine

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ATP ----->  ADP +P + Energy. (Bond is broken by ATPase)  Endothermic

PC-------> P + C + Energy.  (Bond is broken by Creatine Kinase) Exothermic.

Energy from the breakdown of PC RESYNTHESISES ATP from ADP +P.

Creatine stores are limited.

 Application - Jumps, Throws, Kick, Dodge, Sprint,

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Lactic System

Where?                          Muscle Sarcoplasm.

Type?                             Anaerobic.

Fuel?                              Glycogen.

Enzymes?                     GPP, PFK, LDH.

Yield?                             2ATP

Intensity/Duration?          High/>10s - 3 mins

By Products?                  Lactic Acid

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Lactic System


Glycogen ----> Glucose -------->  Pyruvic Acid + Energy ------->Lactic Acid.


Energy + ADP + P = ATP

Known as Coupled Reaction.

Application - 400m Run, 50m Sprint Swim, Sprint the length of the pitch in  


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Aerobic System

Where? Sarcoplasm (St1), Matrix (St2), Cristae (ST3)

Type?                             Aerobic.

Fuel?                              Glycogen/Fat.

Enzymes?                       GPP, PFK.

Yield?            2ATP (1), 2ATP (2), 34ATP (3)

Intensity/Duration?  Medium to Low/3 mins+

By Products?                 CO2/H2O

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Aerobic System

Stage 1 - Anerobic Glycolysis.

 As Lactic System except in the presence of O2 Lactic Acid is not formed and the process moves forward to

Stage 2 - Krebs.

 Pyruvic Acid -------> Acetyl CoA -------> Oxaloacetic Acid/Citric Acid------> 2ATP

Co2 is expelled and Hydrgen is released into....

Stage 3 - Electron Transport Chain.

H+ combine with O2 ----------> H20

 H- enter ETC and are converted to 34ATP.

Application - Endurance Activities, dead ball situations in Games, Time outs etc

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