Bioenergetic and Exercise Metabolism

Front

What is the primary energy system used during high-intensity, short-duration activities?

Back

ATP-PCr system (first 5–10 seconds)

Front

What is the process of anaerobic glycolysis?

Back

Breakdown of glucose to pyruvate and then to lactate.

Front

What are the key metabolic responses during anaerobic exercise?

Back

↑ Lactate accumulation, ↓ pH (metabolic acidosis), ↑ Phosphocreatine resynthesis during rest.

Front

What type of exercise utilizes oxidative phosphorylation?

Back

Aerobic exercise (moderate to low-intensity, sustained activity)

Front

What are the key metabolic responses during aerobic exercise?

Back

↑ VO₂ (oxygen consumption), ↑ Fat utilization, ↓ Muscle glycogen over time.

Front

What is the Crossover Concept in exercise metabolism?

Back

As intensity increases, the body shifts from fat to carbohydrates (CHO) for fuel.

Front

What factors influence the Crossover Concept?

Back

Exercise intensity, duration, training status, and diet.

Front

How do trained individuals differ in fuel usage compared to untrained individuals at higher intensities?

Back

Trained individuals use more fat at higher intensities.

Front

What hormonal changes occur during anaerobic exercise?

Back

↑ Epinephrine, norepinephrine, ↑ Glucagon, ↓ insulin, ↑ Lactate = ↑ GH and cortisol.

Front

What hormonal changes occur during aerobic exercise?

Back

Sustained ↑ in cortisol and GH (promote fat metabolism), ↑ Catecholamines for glucose mobilization.