AQA · A-Level · Physical Education
Course version: 7582 · Version from Sept 2016
Energy transfer during long duration/lower intensity exercise.
Full specification wording
Energy systems: Energy transfer during long duration/lower intensity exercise.
During long duration, lower intensity exercise the aerobic system dominates energy transfer.
Checked against the AQA 7582 specification (opens in a new tab) on .
- Point 12 of 26
- 4 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
During long duration, lower intensity exercise the aerobic system dominates energy transfer. Oxygen is available in sufficient supply, so pyruvate from glycolysis enters the Krebs cycle and the electron transport chain, where large ATP yields are produced from glucose, glycogen and fats. Fat oxidation becomes increasingly important as duration extends, sparing limited glycogen stores. The intensity remains below the lactate threshold, so lactate is cleared as quickly as it is produced and does not accumulate. Aerobic ATP resynthesis is slower than anaerobic resynthesis but sustainable for prolonged periods, supporting events such as marathon running, long-distance cycling or a 1500 m swim.
What earns the marks
- The aerobic system dominates during long duration, lower intensity exercise because oxygen supply meets demand.
- Pyruvate enters the Krebs cycle and electron transport chain, producing large ATP yields from glucose, glycogen and fats.
- Fat oxidation increases as duration extends, sparing glycogen stores and supporting sustained work.
- Intensity stays below the lactate threshold, so lactate is cleared as quickly as it is produced and does not accumulate.
Common mistakes and how to put them right
Thinking the aerobic system produces ATP quickly.
Put it right: It resynthesises ATP more slowly than anaerobic systems but sustains work for long periods.
Assuming only carbohydrate is used.
Put it right: Fats contribute increasingly as exercise duration extends, sparing glycogen.
Believing lactate always accumulates in aerobic exercise.
Put it right: Below the lactate threshold, lactate is cleared as quickly as it is produced.
Confusing long duration lower intensity exercise with sprint events.
Put it right: Sprint and power events rely mainly on anaerobic systems, while long duration lower intensity work relies on aerobic transfer.
Exam tips
- Name the stages: glycolysis, Krebs cycle and electron transport chain, and state that oxygen is available.
- Use a concrete event such as marathon running to show how fat oxidation and glycogen sparing support performance.
- Link intensity to the lactate threshold to explain why lactate does not accumulate during steady aerobic work.
Try the lesson
The start of the Energy systems: Energy transfer during long duration/lower intensity exercise. lesson, made from checked teaching notes for this specification point.
Have a go first
During a long, low-intensity jog, which energy system provides most of the ATP for the working muscles?
Listen
During long duration, lower intensity exercise the aerobic system dominates energy transfer. Oxygen is available in sufficient supply, so pyruvate from glycolysis enters the Krebs cycle and the electron transport chain, where large ATP yields are produced from glucose, glycogen and fats. Fat oxidation becomes increasingly important as duration extends, sparing limited glycogen stores. The intensity remains below the lactate threshold, so lactate is cleared as quickly as it is produced and does not accumulate. Aerobic ATP resynthesis is slower than anaerobic resynthesis but sustainable for prolonged periods, supporting events such as marathon running, long-distance cycling or a 1500 m swim. A strong answer earns marks for these points. The aerobic system dominates during long duration, lower intensity exercise because oxygen supply meets demand. Pyruvate enters the Krebs cycle and electron transport chain, producing large ATP yields from glucose, glycogen and fats. Fat oxidation increases as duration extends, sparing glycogen stores and supporting sustained work. Intensity stays below the lactate threshold, so lactate is cleared as quickly as it is produced and does not accumulate. A common slip: Thinking the aerobic system produces ATP quickly. Instead, it resynthesises ATP more slowly than anaerobic systems but sustains work for long periods. Exam tip: Name the stages: glycolysis, Krebs cycle and electron transport chain, and state that oxygen is available.
Key words
Say what each word means before you turn the card.
Aerobic energy transfer
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Krebs cycle and electron transport chain
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Fat oxidation and glycogen sparing
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Long duration endurance performance
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See every definition
- Aerobic energy transfer
- The aerobic system dominates energy transfer during long duration, lower intensity exercise because oxygen supply meets demand.
- Krebs cycle and electron transport chain
- Pyruvate enters these stages, producing large ATP yields from glucose, glycogen and fats.
- Fat oxidation and glycogen sparing
- Fat oxidation increases as duration extends, sparing glycogen stores and supporting sustained work.
- Long duration endurance performance
- Aerobic ATP resynthesis is slower than anaerobic resynthesis but sustainable for prolonged periods, supporting events such as marathon running.
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