THE ENERGY SYSTEMS
1. THE ATP CYCLE
- Adenosine Triphosphate (ATP)
- When carbohydrates, fats, and proteins are broken down, they produce a substance called ATP.
ATP is the energy fuel of the body for its functions:
● Manufacture and repair tissues
● Production of hormones
● Digestion
● Transmission of nerve impulse
Heat is a byproduct of this process. The reason why one heats up in exercise. This cycle produces energy
for the body.
2. THE PHOSPHOCREATINE ENERGY SYSTEM
- This is used for instantaneous activity lasting several seconds.
- In this system, a fuel called creatine phosphate is used to make ATP. When creatine phosphate is
broken down, the energy process is immediately used to reproduce ATP. Used when in need an
explosive action:
● Dashing away from the dog
● 100–200-meter dash
● Shot put
● Discus Throw
3. THE LACTIC ACID ENERGY SYSTEM
- Glycogen is used without oxygen to produce ATP.
- Glycogen is broken down to a substance known as pyruvate and then to ATP, leaving a
by-product called lactic acid.
- The lactic acid system can sustain quick bursts of high intensity activity. Excessive lactic acid
builds up of converting glycogen to ATP without oxygen may lead to fatigue.
4. THE AEROBIC ENERGY SYSTEM
- This makes use of oxygen with glucose, fatty acids, and even amino acids to produce energy.
- This energy system sustains prolonged activities such as walking, jogging, swimming, cycling,
and circuit based training.
- The by-products are carbon dioxide and water. This can help reduce or control body fat.
1. THE ATP CYCLE
- Adenosine Triphosphate (ATP)
- When carbohydrates, fats, and proteins are broken down, they produce a substance called ATP.
ATP is the energy fuel of the body for its functions:
● Manufacture and repair tissues
● Production of hormones
● Digestion
● Transmission of nerve impulse
Heat is a byproduct of this process. The reason why one heats up in exercise. This cycle produces energy
for the body.
2. THE PHOSPHOCREATINE ENERGY SYSTEM
- This is used for instantaneous activity lasting several seconds.
- In this system, a fuel called creatine phosphate is used to make ATP. When creatine phosphate is
broken down, the energy process is immediately used to reproduce ATP. Used when in need an
explosive action:
● Dashing away from the dog
● 100–200-meter dash
● Shot put
● Discus Throw
3. THE LACTIC ACID ENERGY SYSTEM
- Glycogen is used without oxygen to produce ATP.
- Glycogen is broken down to a substance known as pyruvate and then to ATP, leaving a
by-product called lactic acid.
- The lactic acid system can sustain quick bursts of high intensity activity. Excessive lactic acid
builds up of converting glycogen to ATP without oxygen may lead to fatigue.
4. THE AEROBIC ENERGY SYSTEM
- This makes use of oxygen with glucose, fatty acids, and even amino acids to produce energy.
- This energy system sustains prolonged activities such as walking, jogging, swimming, cycling,
and circuit based training.
- The by-products are carbon dioxide and water. This can help reduce or control body fat.
