Week 4: ATP, creatine, energetics and sprint sports

Question 1

When are fatty acids used

Answer 1

Used a lot during sub max exercise

Role disappears before maximal exercise intensity

Question 2

Creatine phosphate

Answer 2

High energy compound Can drive synthesis of ATP molecule

Question 3

Wingate test

Answer 3

Tests power output and fatigue
Peak- can’t keep that going unless period of recovery
Power output quickly declines- same amount of effort but power still declines
Energy output failing
Creatine phosphate deleted before the end of the 30 seconds
muscle has to use other energy systems which work slower so slower legs

Question 4

Creatine

Answer 4

Act to buffer ATP

Question 5

PCr use and resyntheis

Answer 5

• Sufficient ATP for about 2 seconds of maximal activity
• PCr and glycogen contribute to ATP utilisation > 2 seconds
• PCr does not contribute much > 20 seconds
• Fatigue during high intensity exercise is multifactorial but in sprint/power activity PCr availability is key
• The enzyme involved in PCr turnover is creatine kinase- it may have different forms with distinct roles

Question 6

Creatine supplementation and high intensity exercise

Answer 6

syntheised in liver
ingested in diet
ingesting creatine increases Cr content
Improves performane- more high energy store, more buffering of H plus, faster re synthesis of creatine phosphate
Creatine ingesting may augment training induced gains in muscle mass