3 different energy systems Flashcards
what are the 3 different energy systems
aerobic system
lactic acid system/lactate anaerobic system
ATP-PC system/phosphocreatine system
the 3 different energy systems durations
aerobic system - 3 min +
lactic acid system - 8-10sec (up to 3 mins)
ATP-PC system - 0-10 sec
aerobic system
- provides energy for low level intensity activity in a game
- used for recovery during breaks in play/EPOC
how does the aerobic system provide energy?
- glycolysis
- carbohydrates broken down into pyruvate
- beta oxidisation
- oxidation of acetyl-coenzyme-A / production of carbon dioxide as part of krebs cycle
- ETC forms water and hydrogen ions
- large quantities of ATP produced or resynthesized
how does lactic acid system provide energy?
- glycogen/glucose breakdown/anaerobic glycolysis
- to pyruvate
- 2 ATP produced
lactic acid energy system
games require energy for high intensity activity
ATP-PC system
provides energy for high intensity activity
short powerful movements up to 10s
how does ATP-PC system provide energy?
- PC broken down
- energy used for ATP resynthesis
- 1 ATP produced
advantages of aerobic system
+ more ATP can be produced : 36 ATP
+ no fatiguing byproducts (co2 and h2o)
+ lots of glycogen stores so exercise can last for a long time
disadvantages of aerobic system
- complicated system, cannot be used straight away. takes a while for oxygen to become available to meet demands of activity and ensure glycogen and fatty acids are completely broken down
- fatty acid transportation to muscles is low and also requires 15% more oxygen to be broken down than glycogen
advantages of ATP-PC system
+ ATP can be re-synthesised rapidly
+ phosphocreatine stores can be re-synthesised quickly
+ no fatiguing by-products
+ possible to extend the time the ATP-PC system can be utilised through use of creatine supplementation
disadvantages of ATP-PC system
- limited supply of phosphocreatine in muscle cell
- only one mole of ATP can be re-synthesised for every mole of PC
- PC re-synthesis can ONLY take place with oxygen
advantages of anaerobic glycolytic system
+ ATP can be resynthesized quick due to few chemical reactions and lasts longer than ATP system
+ in presence of oxygen, lactic acid can be converted back into liver glycogen
+ can be used for a sprint finish
disadvantages of anaerobic glycolytic system
- lactic acid as the by-product. it accumulates and denatures enzymes
- only small amount of energy can be released from glycogen under anaerobic conditions
