anaerobic energy systems

a sport such as tennis uses the ATP-PC system fr energy proaction - outline the advantages and the disadvantages of the ATP-PC system

percentage of energy systems in a 400m race

0-10 seconds - 90% PC, 5% anaerobic, 5% aerobic

10-20 seconds - 80% anaerobic, 20% aerobic

20-30 seconds -70% anaerobic, 30% aerobic

30-40 seconds - 50% anaerobic, 50% aerobic

this is due to increasing heart rate so more oxygen to bring round to the muscles

all 3 systems begin to produce energy - the ATP-PC systems contributes by far the most ATP (energy) in the first 5 seconds, after this time the PC is depleted about 50%

the lactic acids system is at its peak between 5-15 seconds so it becomes the major contributor as the ATP-PC system slows down from 5 seconds

the ATP system contributes to supply ATP until fully depleted after around 10 seconds

the LA system continues to be the major contributor until around 30 seconds when the aerobic system has had time to begin to supply more ATP. the LA system begins to slow down after 30 seconds as the aerobic system takes over more. 

the LA system continues to supply some ATP fro the duration - but has slowed down to avoid fatigue caused by excessive lactic acid accumulation 

the lactic acid system supplies most ATP for this event.

excess post-exercise consumption (EPOC)

the amount of oxygen consumed during recovery above which would have been consumed at rest 

oxygen deficit

the difference between oxygen uptake of the body during early stages of exercise and during a similar duration in a steady state of exercise

fast component

the restoration of ATP and phosphocreatine stores and the re-saturation of myoglobin with oxygen

slow component 

the removal of lactic acid via the cori cycle and the replenishment of glycogen stores 

cori cycle

the process where lactic acid is transported in the blood to the liver where it is converted back into glucose and glycogen

oxygen debt

the amount of extra oxygen required by muscle tissue to oxidise lactic acid and replenish depleted ATP and phosphocreatine stores following rigorous exercise