Calorie and Energy Expenditure Information
How Anaerobic and Aerobic Energy Powers Muscles?

Activity Fuelled by Non-Aerobic Sources of Energy in Muscles and Liver
Anaerobic ATP-Adenosine Triphosphate Energy - Anaerobic Glycolysis - Aerobic Metabolism of Body Fat
Anaerobic, Aerobic Energy and Muscles

Fitness Information About Anaerobic and Aerobic Oxygen Energy
Develop Muscles - Raise Metabolism - Review of Exercise Equipment
Burn Body Fat - Lose Weight - How to Get Flat Stomach - Lose o Fat
Reduce Weight - Aerobic Exercise - Aerobic Training - Anaerobic

Calories Advice - Calories in Food


Anaerobic, Aerobic Energy and Muscles Fitness Workout

Anaerobic vs. Aerobic Energy

How Anaerobic and Aerobic Energy Powers Muscles?

In simple terms, how muscles are powered varies according to the time spent exercising. To begin with, (about the first two minutes of exercise), the body cannot get enough oxygen to supply the heart and muscles which need to work faster than normal. So the muscles are forced to rely upon non-oxygen sources of energy (anaerobic). Then, as the supply of oxygen rises, muscles move into aerobic metabolism. As follows:

Stage 1. Anaerobic ATP-PC Energy System

This occurs during roughly the first 15 seconds of continuous exercise. The muscle is powered by energy-rich ATP (adenosine triphosphate) molecules (located in the muscle itself). If muscular contractions continue for longer than this, the energy must be sourced from glycogen, which is also stored in the muscles.

Stage 2. Anaerobic Glycolysis

This occurs during roughly the first two minutes of continuous exercise. During this time, once ATP-PC is exhausted, the muscles are supplied with energy from their own glycogen sources. [Glycogen is blood-glucose, specially stored in the muscles.] If you exercise continuously for longer than about 2 minutes, you eventually burn up all of the glycogen stored within the individual muscle.

Stage 3. Energy from Glycogen During Aerobic Activity

This stage lasts for about 20 minutes. During this period of continuous exercise, if you breathe correctly, the muscles are powered by more glycogen (stored blood-glucose) which comes via the bloodstream from the liver (and other muscles) to help you continue exercising.

Stage 4. Aerobic Fat-Burning

This is the final stage. After about 20 minutes of continuous exercise, the body's stores of glycogen become exhausted, and the body starts using stored body fat for fuel to power the muscles. This process of fat metabolism occurs in the presence of oxygen. This is how sustained aerobic exercise helps to burn fat and thus causes weight loss. In fact, the body continues to burn body fat - even after your exercise has ceased - which it converts to blood glucose and uses to replenish its stores of glycogen in the liver and muscles. Thus fat-burning continues for several hours.

Back to Advice About Exercise and Fitness Programs

Calorie Intake

For information about the calorie content of popular food and drinks, please visit: Calories in Food

Back to Top

Energy Expenditure and Calorie-Burning

Exercise Advice to Burn Calories - Activity Calorie Calculators - Aerobic Exercise Advice - Anaerobic Exercise - Basal Metabolic Rate - Best Exercise During Pregnancy - Best Exercise Advice - Best Exercise for Weight Loss - Best Exercises - Best Time to Exercise - Body Composition and Fitness - Calories and Exercise - Energy Burned by Exercise - Walking - Calories Burned Jogging - Running - Calories Burned Treadmill - Biking - Elliptical Trainers - Calories Burned Pilates - Cardio Exercise Health Benefits - Exercise Equipment Review - Exercise Intensity Advice - Exercise Program 60 Min - Exercise for Bigger Muscles - Exercise Programs to Burn Fat - Exercise to Build Muscle - Exercise for Flat Stomach - Exercise to Lose Body Fat - Exercise to Lose Weight - Exercise Workout Advice - Exercise to Raise Metabolic Rate - Exercise Program for Obesity - Exercise Workouts to Reduce Weight - Fitness Health Guide - Fitness Guidelines - Fitness Workout Guide - Exercise Heart Rate Advice - How Long to Exercise - How Many Calories to Burn in Training - How Often to Exercise - Strength-Training Benefits

Information About Calories and Energy Equation

List of Calories in Food - Definition of Calorie - Definition of Kilocalories (kcals) - Calorie Needs to Maintain Weight - Calorie Needs for Children - Calorie Needs for Teenagers - Calorie Intake per Day - Calorie Intake and Age - Calorie Intake/ Expenditure - Calories in One Pound of Body Fat - Weight Loss Diets - Weight Loss and Calories - Calorie-Counting to Lose Weight - Calories Needed to Lose Weight - Calories and Weight Control

Calorie-Counter.net provides general information about how to burn calories, what type of exercise workout is best for calorie burning, what fitness training is best to raise metabolic rate and how to achieve your weight loss goals through training workouts. Copyright 2002-2017.