energy systems introduction as physical education 2013
DESCRIPTION
energy systems, as peTRANSCRIPT
Energy
1. State the only useable energy source in the body and the duration of exercise possible using the bodies stores of ATP2. Name 2 anaerobic energy systems and 1 aerobic energy systems3. Describe 3 energy systems using the key terms intensity and duration
Learning Outcomes are:
Energy is the ability or capacity to do work and is measured in calories or joules.
ATP(Adenosine
Tri-phosphate)Small amounts stored within muscle
cell – total in body – 85g
Enough for 2-3 seconds of exercisee.g. ???????
ATP ADP + P + EnergyATPase
……………is the only immediately usable energy source for all bodily functions and activities (movements).
With only 2-3 seconds of ATP in the body – we need to re-synthesise some!
The body has three processes for doing this – 3 ‘energy systems’
The intensity and duration of the task being performed dictates which of these systems is used
Energy Systems
PC P + C +
ADP + P + ATP
ATP-PC System
Energy
Energy
Stage 1
Stage 2
Lactic Acid
SystemC.H.O.
Glucose
Pyruvic Acid
Lactic Acid
2 ATP
No O2
C.H.O.
Glucose
Pyruvic Acid
Kreb’s Cycle
2CO2
Hydrogen
H2O
Stage 1
Stage 2
Stage 3
34 ATP
2 ATP
2 ATP
Electron Transfer
chain
Aerobic System
C6H1206 + 6O2 = 6CO2 +6H2O + ENERGY
Aerobic System
2. During a 1500m race all three energy systems are used to
replenish ATP.
Using the 1500m as your example ,explain when each of the energy systems would be
predominant? (4)
1. The continued replenishment of Adenosine Tri-Phosphate (A.T.P) is essential in maintaining sporting performance. Use a chosen sporting activity to explain when each energy system would be used to replenish A.T.P. [3]
Question 1 – Mark Scheme
(Separate specific sporting activity for each is acceptable.)a. ATP-CP used during very high intensity (95-100%)b. Anaerobic glycolysis/lactic acid system high intensity with longer duration, up to 90 secsc. Aerobic Low to moderate intensity high durationd. Intensity of aerobic exercise and individual fitness level of will determine the use of fats or carbse. Interchangeable and overlap of the energy systems through the energy continuumf. (3 x 1 only if examples are specific from sport/activity)
The relative contribution of each energy system to ATP re-synthesis it is determined by the intensity and duration of exercise.
● Start - ATP - PC High intensity sprint off line to gain position
● Limited supply/short duration of ATP-PC (approx 10 secs) means also use anaerobic glycolysis for the first 100-150m
● Limited supply of muscle glycogen/build up of lactic acid means intensity has to drop
● Pace settles using aerobic system at a lower intensity/high duration
● Working under anaerobic threshold (60-80%)
● As pace builds towards end of race as intensity increases more anaerobic energy will be used
● Final sprint more ATP-PC
Must be related to the actual race in terms of intensity and duration.
Question 2 – Mark Scheme
o On each table there is one hula hoopoTime each member of the group to see how long they can hula for (max 3 attempts if necessary) – record resultsoNext to the best time for each member of the group state which energy system is being usedoWho has the longest time?
Hula Hoop Challenge
1. State the only useable energy source in the body and the duration of exercise possible using the bodies stores of ATP2. Name 2 anaerobic energy systems and 1 aerobic energy systems3. Describe 3 energy systems using the key terms intensity and duration
Learning Outcomes are: