Bioenergetics — Anaerobic vs. Aerobic Energy Production
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The umbrella concept for where muscle gets its energy — anaerobic (ATP-PC and glycolytic, no oxygen) versus aerobic (with oxygen).
Detail
Bioenergetics concerns the source of energy for muscle activity. Energy production is divided by whether oxygen is required:
Anaerobic — energy production without oxygen
- ATP-PC System
- Glycolytic (Lactic Acid) System
Aerobic — energy production with oxygen
- Aerobic (Oxygen) System
Anaerobic means insufficient oxygen. Anaerobic metabolism plays a crucial role in many sports, so a basic understanding of the mechanisms is needed. It is divided into two systems: the ATP-PC (Adenosine Triphosphate and Phosphocreatine) system, and the Lactic Acid (glycolytic) system. The two provide energy when demand exceeds supply.
ATP is the energy molecule — the source of immediate energy for muscle action. It is used by the crossbridges to pull the actin filaments across the myosin filaments to cause muscle shortening. Key abbreviations:
- ATP = adenosine triphosphate
- ADP = adenosine diphosphate
- Pi = inorganic phosphate
With a particular activity, one or two systems dominate as the energy provider while the others may continue to function as well.
Key facts
- Bioenergetics = the source of energy for muscle activity.
- Anaerobic (no oxygen): ATP-PC system + glycolytic system.
- Aerobic (with oxygen): the oxygen system.
- ATP is the immediate energy molecule; crossbridges use it to pull actin across myosin.
- ATP = adenosine triphosphate; ADP = adenosine diphosphate; Pi = inorganic phosphate.
Connections
- ATP-PC (Phosphagen) System — first anaerobic system.
- Lactic Acid (Glycolytic) System — second anaerobic (glycolytic) system.
- Oxygen (Aerobic) Energy System — the oxygen system.
- ATP — The Energy Molecule — the energy currency these systems regenerate.
- General Characteristics of the Energy Systems (Comparison Table) — comparison table of all three.
- Energy Metabolism Summary and ATP Yields — the summary outline / ATP yields.
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