Bigger Faster Stronger Achievement Standard 2 3 3

Bigger, Faster, Stronger Achievement Standard 2. 3 3 Credits ENERGY SYSTEMS IN THE HUMAN BODY

Energy Systems in the Human Body In the body there are three systems or processes that break down ATP to release energy. One is an aerobic process and the other two are anaerobic. ENERGY SYSTEMS ANAEROBIC CP LACTIC ACID

ATP is the chemical that our body breaks down to produce energy. Adenosine P P P Adenosine Energy released P P P ATP is broken down to ADP and P— this releases energy The body moves through three energy systems when exercising which system is used by the body is dependent on the time and intensity of the activity undertaken.

1. CP (Creatine Phosphate System) Ø Creatine Phosphate combines with broken down ATP stored in the muscles to provide energy for up to 10 seconds. Ø This system provides very rapid energy for the body when it doesn’t have time to use oxygen or break down other fuels. Ø E. g Lifting a weight in competition.

2. The Anaerobic System Ø Ø Ø Anaerobic means without oxygen. This energy system uses glucose which is broken down to produce ATP. Lactic acid is formed during anaerobic glycolysis and accumulates in the muscles and blood. It causes fatigue. This system is called on when short bursts of energy are required for intense activity E. g 400 m sprint. Activities fuelled by the lactic acid (anaerobic glycolysis) system last from around 30 seconds to 3 minutes.

3. The Aerobic System Aerobic means with oxygen. Ø At rest and during everyday activities, energy is released aerobically. Ø In the aerobic system of energy formation, oxygen is present when ATP is made. Because of this, large amounts of ATP are made without the formation of lactic acid. Ø This system is suited to lower intensity long duration activities. Ø E. g. Marathon running. Ø