S2L2 Anaerobic energy provision

Question 1

what is the ATP-PCr system?

Answer 1

• 3-15 secs
• 1mol of ATP per mol of PCr
• creatine supplementation –Pcr + ADP + H+ >Cr + ATP. can lead to weight gain
• myokinase reaction - ADP+ADP > ATP +AMP. only high intensity.

Question 2

What is the glycolytic system?

Answer 2

= breakdown of glucose/glycogen via glycolysis.
- ATP yield = 2/3 ATP per molecule of glucose/glycogen.1/1.5 ATP per lactate if all pytuvate converted ot lactate
- 15-2 mins

Question 3

What are the key enzymes involved in glycolysis and krebs?

Answer 3

• PFK - limiting this leads to decrease in ATP production
• Citrate synthase

Question 4

What systems are used at different stages of exercise?

Answer 4

• 3-15 secs - PCr breakdown e.g. 100m
• 15-2 mins - anaerobic glycolysis -e.g. 400m
• 2-90 mins - oxidative metabolism (glucose) e.g. half marathon
• 170 hours - oxidative metabolism (fat)

Question 5

What is the wingate test for?

Answer 5

to determine peak power and fatigue index
- peak power = highest power output measure
- fatigue index = % drop from peak power to lowest power. (peak power-lowest power) / peak power x 100

Question 6

What muscle fibre type generates the most ATP during the wingate test?

Answer 6

• first 10 secs - ATP from type IIx
• After 10 secs - contribution from type I fibres