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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
Vital capacity is the maximum volume of air that can be forcefully exhaled after a maximum inhalation. Regular training strengthens the respiratory muscles (intercostals and diaphragm), allowing deeper breaths and a greater vital capacity.
Benefits:
| Measure | Untrained Adult | Trained Athlete |
|---|---|---|
| Vital capacity | ~4.5–5.0 litres | ~5.5–6.5 litres or more |
With more capillaries around the alveoli (capillarisation) and stronger respiratory muscles, the overall efficiency of gaseous exchange improves. Oxygen passes more quickly from the alveoli into the blood, and carbon dioxide is released more efficiently.
Muscular hypertrophy is the increase in size of skeletal muscles resulting from regular resistance or strength training. The individual muscle fibres increase in diameter, making the whole muscle larger and stronger.
Benefits:
Exam Tip: Do not confuse cardiac hypertrophy (enlargement of the heart muscle) with muscular hypertrophy (enlargement of skeletal muscles). They are both long-term effects, but they affect different types of muscle and result from different types of training.
Weight-bearing exercise (such as running, jumping, and resistance training) places stress on the bones, which respond by becoming denser and stronger. This reduces the risk of fractures and conditions such as osteoporosis in later life.
Regular training strengthens the tendons (connecting muscle to bone) and ligaments (connecting bone to bone), reducing the risk of injury and improving joint stability.
| System | Long-Term Effect | Benefit |
|---|---|---|
| Cardiovascular | Cardiac hypertrophy | Heart is larger and stronger; pumps more blood per beat |
| Cardiovascular | Bradycardia | Lower resting HR; heart is more efficient |
| Cardiovascular | Increased stroke volume | More blood ejected per beat, at rest and during exercise |
| Cardiovascular | Increased blood volume and red blood cells | More oxygen can be transported |
| Cardiovascular | Capillarisation | Better O₂ delivery and waste removal at muscles and lungs |
| Respiratory | Increased vital capacity | More air exchanged per breath |
| Respiratory | Improved gaseous exchange | More efficient O₂ and CO₂ transfer |
| Musculoskeletal | Muscular hypertrophy | Muscles larger and stronger |
| Musculoskeletal | Increased bone density | Bones stronger; reduced fracture risk |
| Musculoskeletal | Stronger tendons and ligaments | Reduced injury risk; better joint stability |
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