ATP-PC System

Question 1

Steps of the ATP-PC system

Answer 1

> 5 steps
For quick energy production

Question 2

Step 1

Answer 2

ATP is broken down at the cross bridge to release energy for muscle contraction (ATPase)

Question 3

Step 2

Answer 3

Leaving the by products Adenosine Diphosphate (ADP) and one single phosphate (Pi)

Question 4

Step 3

Answer 4

Phosphocreatine (PC) is then broken down into creatine and one single phosphate (Pi) by creatine kinase

Question 5

Step 4

Answer 5

The energy released in the breakdown of PC allows the resynthesis of ATP, assisted by ATPase

Question 6

Step 5

Answer 6

New ATP can now be broken down again to release energy to fuel activity

Question 7

When does the ATP-PC system work?

Answer 7

> During the first few seconds of exercise, regardless of intensity, it is used exclusively
After PC stores run out, other energy systems must be relied upon
Stores are replenished about 2 minutes after rest

Question 8

ATP-PC system: sporting context

Answer 8

> Sprint events (100m)
Javelin, shot put, high/long jump
Gymnastics vault
Sprints followed by recovery - team sports

Question 9

Training the ATP-PC system

Answer 9

> Maximal intensity work - 10 seconds
2 minutes rest
1s:12s work:rest ratio

Question 10

ATP-PC system: +

Answer 10

> High intensity
PC readily available in muscles
No delay for O2
Simple/rapid breakdown of PC and resynthesis of ATP
Explosive initial movements
Replenishes quickly (2min)
No fatiguing by-products (lactic acid)

Question 11

ATP-PC system: -

Answer 11

> Low energy yield (1ATP produced)
Exhausts quickly (10 seconds)