P.E

Energy

the ability or capacity to do work, and it is measured in calories or joules. It is required by the body to perform any kind of physical activity or physiological function.

Energy System

refers to the specific mechanism by which the body produces and utilizes energy. These systems allow the body to convert the energy from food into usable forms that support movement and bodily functions.

Carbohydrates (CHO)

The body’s preferred source of fuel during exercise. Stored in muscles and liver as glycogen.

Fats

A concentrated fuel source, especially used during rest and prolonged submaximal (low to moderate intensity) exercise.

Protein

Primarily used for growth and repair of tissues. Used as an energy source only when carbohydrates and fats are insufficient.

Adenosine Triphosphate

ATP

ATP

A molecule that provides immediate energy to support cellular functions, especially muscle contraction and nerve impulse transmission.

PCr

An organic compound that helps the body quickly regenerate ATP.

Glycolytic System (Lactic Acid System)

Best for moderate to high-intensity activities lasting 30 seconds to 2 minutes (e.g., 400m sprint).

Oxidative System (Aerobic System)

No lactic acid produced, making it sustainable over longer periods.

Aerobic Exercise

Involves continuous activity that uses oxygen.

Anaerobic Exercise

Involves quick bursts of energy at maximum effort for a short duration.

Anaerobic Exercise

Utilizes the ATP-PC System and the Glycolytic System.

The intensity of the activity

The duration of the activity

The fitness level of the individual

The contribution of each system depends on?

EXERCISE

Increases your overall health and your sense of well-being, which puts more pep in your step every day.

endorphins

the body’s natural pain killer to reduce stress and improve the mind’s perception of the world.

FITT Principle

is a guideline to help plan effective workouts

Frequency

F

Intensity

I

Time

T

Type

T