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An average time for the completion of an agility test is 17 seconds for males and 19 seconds for females.
Identify the two predominant energy systems that would be used by an average performer during the completion of the test.
Discuss the advantages and disadvantages of one of the systems.
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(ii)
An average time for the completion of an agility test is 17 seconds for males and 19 seconds for females.
Identify the two predominant energy systems that would be used by an average performer during the completion of this test.
Discuss the advantages and disadvantages of one of the energy systems you have identified.
6 marks total
2 marks for identification of energy systems
1. ATP/PC/alactic/phosphogen
2.lactic acid/anaerobic glycolysis
4 marks for discussion of advantages and disadvantages
NB: Mark.one energy system only
(ATP/PC)(Advantages)
3. very quick/immediate resynthesis of ATP
4. PC stores are quickly replenished as soon as activity stops/50% in
30secs
5. anaerobic, so no need to wait for sufficient O2 to be in body
6. no fatiguing by-products
(Disadvantages)
7. only a limited supply of PC in muscles/enough for only 10 seconds of activity
8. PC stores can only be replenished in the presence of O2/during
recovery periods
9. limited resynthesis of ATP/only 1 ATP
(Lactic acid system)
(Advantages)
10. relatively quick/few reactions
11. anaerobic, so no need to wait for sufficient O2 to be in body
12. lactic acid can be converted back to liver glycogen/used as a fuel
by conversion back to pyruvic acid
13. can use this system to increase intensity during exercise eg. sprint
finish in 1500m
(Disadvantages)
14. build up of lactic acid that increases acidity of blood and muscles
15. this inhibits enzyme action (glycogen phosphorylase and PFK),
stopping further breakdown of glycogen
16. also affect pain receptors in nerve endings causing discomfort
17. to continue exercise intensity must be lowered or stopped
18. limited amount of energy is released from glycogen in the absence
of O2/enough to resynthesise 2ATP