Energy Systems

What are the three main energy systems used by the human body during physical activity?

The ATP-PC System, the Lactic Acid System, and the Aerobic System.

What is the primary energy source for muscular contractions?

Adenosine Triphosphate (ATP) is the immediate energy source.

What does the ATP-PC System provide energy for?

High-intensity, short-duration activities such as sprinting and weightlifting.

What is produced as a byproduct of the Lactic Acid System?

Lactic acid is produced as a byproduct.

What is the advantage of the Aerobic System during exercise?

It produces a high yield of ATP and can utilize multiple fuel sources.

What is a disadvantage of the ATP-PC System?

The stores of phosphocreatine are limited and deplete quickly.

Which energy system is dominant during short bursts of activity (<10s)?

The ATP-PC system is dominant.

What causes muscle fatigue during the Lactic Acid System?

Lactic acid accumulation leads to muscle fatigue and discomfort.

What adaptation occurs in the Aerobic System with regular training?

Increased mitochondrial density and enhanced oxygen delivery.

During which activities does the Aerobic System become the primary energy provider?

During long duration activities (>2 min) like long-distance running and cycling.

What factors influence which energy system predominates during exercise?

Intensity of activity, duration of activity, fitness level, and availability of oxygen.

How do training adaptations improve the Lactic Acid System?

Improved ability to buffer and tolerate lactic acid and enhanced glycolytic enzyme activity.

Which energy system would be primarily used in mid-distance events like the 400m?

The Lactic Acid System is primarily used.

Name one adaptation that occurs in the ATP-PC System with training.

Increased stores of phosphocreatine.

What is the role of oxygen in the Aerobic System?

Oxygen is required to efficiently produce ATP.

What is the primary energy system used in endurance sports like marathons?

The Aerobic System.

How does the body regenerate ATP?

Through different energy systems including the ATP-PC system, the Lactic Acid system, and the Aerobic system.