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While short-term effects are temporary responses that disappear after exercise, long-term effects (also called chronic adaptations) are permanent physiological changes that result from regular training over weeks, months and years. These adaptations make the body more efficient at coping with the demands of exercise. Understanding long-term effects is a key requirement of the Edexcel GCSE PE specification (1PE0 — Topic 1: Applied Anatomy and Physiology and Topic 2: Physical Training).
Long-term effects are structural and functional changes that occur in the body as a result of consistent, repeated exercise over an extended period. Unlike short-term effects, they do not reverse immediately when you stop exercising (although they will gradually diminish if training ceases — the principle of reversibility).
Cardiac hypertrophy is the increase in size and thickness of the heart muscle (myocardium), particularly the muscular wall of the left ventricle. Regular endurance training causes the heart to work harder repeatedly, and it adapts by growing larger and stronger — just as skeletal muscles grow with resistance training.
Benefits:
Bradycardia is a resting heart rate below 60 bpm. In trained athletes, resting heart rate can drop to 40–50 bpm or even lower (elite endurance athletes such as Sir Mo Farah have recorded resting heart rates around 33 bpm).
Why does it happen?
Cardiac Output=Stroke Volume×Heart Rate
If SV increases, HR can decrease and cardiac output remains constant.
| Measure | Untrained Adult | Trained Endurance Athlete |
|---|---|---|
| Resting HR | 70–80 bpm | 40–55 bpm |
| Stroke volume (rest) | ~70 ml | ~100–110 ml |
| Resting cardiac output | ~5 l/min | ~5 l/min |
Exam Tip: Edexcel loves questions about bradycardia. Always explain the cause (cardiac hypertrophy → increased stroke volume) and the consequence (heart is more efficient, beats fewer times to pump the same amount of blood).
As a direct result of cardiac hypertrophy, the left ventricle can hold more blood and contract more forcefully, ejecting a greater volume of blood per beat. This is true both at rest and during exercise.
During maximal exercise, a trained athlete's stroke volume may reach 170–200 ml, compared with 100–120 ml in an untrained individual.
Regular aerobic training leads to an increase in total blood volume, including a rise in the number of red blood cells and the amount of haemoglobin they contain.
Benefits:
Capillarisation is the development of new capillaries (tiny blood vessels) around the muscles and alveoli in the lungs.
Benefits:
graph LR
A[Regular Aerobic Training] --> B[Cardiac Hypertrophy]
B --> C[Increased Stroke Volume]
C --> D[Bradycardia<br>Lower Resting HR]
A --> E[Increased Blood Volume<br>and Red Blood Cells]
A --> F[Capillarisation]
C --> G[Greater Cardiac Output<br>During Exercise]
E --> G
F --> H[Improved O₂ Delivery<br>and CO₂ Removal]
G --> H
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