Energy systems

Question 1

ATPCP energy system

Answer 1

An immediate energy system that does not require oxygen.
FUEL: Uses a combination of stored ATP + the stored creatine phosphate
INTENSITY: Maximum efforts >95% max HR
DURATION: Short duration 0-10 seconds
RATE OF RESYNTHESIS: Very fast
SPORTS: Sprinting, Jumping, Throwing, Weight lifting

Question 2

Lactic acid system

Answer 2

relies on the breakdown of glycogen, in the absence of oxygen, to produce energy.
FUEL: Carbohydrate/Glycogen
INTENSITY: 80 - 95% max HR
DURATION: Will take over as predominant system when ATP–CP system fatigues (PC stores depleted at around 5–10 seconds). Predominant 10–60 second events. Peak power is usually reached between 5–15 seconds.
RATE OF RESYNTHESIS: Fast
SPORTS: Used for sustained sprint or muscular endurance activities usually lasting between 45 – 60 seconds eg. 400 m sprint

Question 3

Aerobic system

Answer 3

The breakdown of glycogen in the presence of oxygen to produce energy, carbon dioxide, water and heat.
FUEL: Carbohydrate + Fat (depending on intensity, duration)
INTENSITY: During rest and at sub-maximal intensities < 80% HR max
DURATION: Gradual increase in contribution as O2 becomes available. Predominant energy system after 30 – 60 secs (depending on intensity).
RATE OF RESYNTHESIS: Slow
SPORTS: Endurance - Marathon