PE9: Short and Long Term Effects of Exercise
Immediate, short-term and long-term effects of exercise on the cardiovascular, respiratory and muscular systems.
⏱️ Three Categories of Effects
Key Concept: The effects of exercise are categorised by how quickly they occur and how long they last:
- Immediate effects - occur during and straight after a single exercise session
- Short-term effects - occur up to 24-36 hours after exercise
- Long-term effects - occur after weeks and months of regular training (adaptations)
⚡ Immediate Effects of Exercise
These are the body's responses DURING exercise and in the minutes immediately after:
Cardiovascular System
- Heart rate increases - from ~72 bpm at rest to 150-200+ bpm during intense exercise
- Stroke volume increases - the heart pumps more blood per beat
- Cardiac output increases - from ~5 l/min at rest to 20-40 l/min
- Blood pressure increases - systolic pressure rises; diastolic may stay similar or decrease slightly
- Vasodilation of blood vessels to working muscles; vasoconstriction of vessels to digestive organs
- Blood is redirected to working muscles (up to 80% of cardiac output goes to muscles during maximal exercise vs ~20% at rest)
Respiratory System
- Breathing rate increases - from ~12-15 breaths/min to 40-50+ breaths/min
- Tidal volume increases - from ~500 ml to 2,000-3,000 ml
- Minute ventilation increases - from ~6 l/min to 100-150+ l/min
- More oxygen is extracted from the air by the alveoli
Muscular System
- Increased muscle temperature - muscles warm up, improving elasticity and speed of contraction
- Increased production of energy (ATP) from aerobic and anaerobic systems
- Lactic acid accumulation during high-intensity exercise
Other Immediate Effects
- Sweating increases - to cool the body through evaporation
- Skin reddens - vasodilation of skin blood vessels to release heat
- Pupils dilate - part of the sympathetic nervous system response
⏳ Short-Term Effects of Exercise (up to 24-36 hours)
These occur after exercise has finished and can last up to a day or two:
Delayed Onset Muscle Soreness (DOMS): Muscle pain and stiffness that develops 24-72 hours after exercise, particularly following eccentric muscle contractions or unaccustomed activity. Caused by microscopic tears (micro-tears) in muscle fibres, not by lactic acid build-up.
- Muscle fatigue - the inability of a muscle to maintain its force of contraction
- Micro-tears in muscle fibres - particularly after intense or eccentric exercise
- Elevated heart rate - takes time to return to resting levels during recovery
- Elevated breathing rate - remains raised during EPOC
- Lactic acid removal - the body continues to process and remove lactic acid
- Muscle stiffness - reduced range of movement due to muscle damage
- Dehydration - if fluid lost through sweating is not replaced
DOMS in Sport
After running a marathon or performing heavy weight training (especially exercises with a significant eccentric component like downhill running or lowering heavy weights), an athlete may experience DOMS. The muscles feel tender and sore, particularly when stretched or contracted. This typically peaks at 24-48 hours post-exercise and resolves within 3-5 days. Light active recovery (gentle walking or swimming) can help reduce DOMS by increasing blood flow to the affected muscles.
🏋️ Long-Term Effects of Exercise (Training Adaptations)
These are the permanent changes that occur after weeks and months of regular training:
Cardiovascular Adaptations
Cardiac Hypertrophy: The heart muscle (particularly the left ventricle) grows larger and stronger as a result of regular aerobic training. This allows the heart to pump more blood per beat.
Bradycardia: Resting heart rate decreases below 60 bpm in trained athletes. A larger, stronger heart can pump the same cardiac output with fewer beats because stroke volume has increased.
Increased Stroke Volume: At rest and during exercise, the heart pumps more blood per beat. Resting SV increases from ~70 ml/beat to 100-120 ml/beat in trained athletes.
Increased Cardiac Output (max): Maximum cardiac output increases significantly - from ~20-25 l/min in untrained to 35-40 l/min in elite athletes. This means more oxygen can be delivered to working muscles at maximal effort.
Capillarisation: The network of capillaries surrounding the heart and working muscles increases. More capillaries mean a greater surface area for gaseous exchange and more efficient delivery of oxygen and removal of waste products.
- Lower resting blood pressure - reduced risk of cardiovascular disease
- Faster recovery rate - heart rate returns to resting levels more quickly after exercise
- Increased blood volume - more red blood cells and plasma
Respiratory Adaptations
Increased Vital Capacity: The maximum volume of air that can be breathed in or out increases. Trained individuals can take in more air per maximal breath.
- Stronger respiratory muscles - diaphragm and intercostals become more efficient
- Increased tidal volume at max effort - can move more air per breath during intense exercise
- Improved gaseous exchange efficiency - better delivery of oxygen to and removal of CO₂ from the blood
Muscular Adaptations
Hypertrophy: An increase in the size of muscle fibres as a result of regular resistance training. Muscle cross-sectional area increases, producing greater force.
- Increased number of mitochondria - more sites for aerobic energy production
- Increased myoglobin content - more oxygen can be stored and transported within muscle cells
- Increased stores of glycogen and PC - more fuel available for exercise
- Increased tolerance to lactic acid - can exercise at higher intensities before fatigue
- Improved coordination and recruitment of muscle fibres
Other Long-Term Adaptations
- Stronger ligaments and tendons - more resistant to injury
- Increased bone density - weight-bearing exercise stimulates bone growth, reducing osteoporosis risk
- Reduced body fat - regular exercise increases metabolic rate
- Improved immune system function - moderate regular exercise reduces infection risk
📊 Summary Table of Long-Term Effects
| System | Long-Term Effect | Benefit for Sport |
|---|---|---|
| Cardiovascular | Cardiac hypertrophy | Stronger heart pumps more blood per beat |
| Cardiovascular | Bradycardia | Heart works more efficiently at rest |
| Cardiovascular | Increased stroke volume | More oxygen delivered per beat |
| Cardiovascular | Capillarisation | Better gaseous exchange at muscles |
| Respiratory | Increased vital capacity | More air per maximal breath |
| Muscular | Hypertrophy | Greater force production |
| Muscular | More mitochondria | Greater aerobic energy production |
| Muscular | More myoglobin | More oxygen stored in muscles |
| Skeletal | Increased bone density | Reduced injury risk |
❓ Practice Questions
Q1: State three immediate effects of exercise on the cardiovascular system.
Q2: What is DOMS and what causes it?
Q3: Explain the difference between cardiac hypertrophy and bradycardia.
Q4: How does capillarisation improve performance?
Q5: Explain why a trained athlete recovers faster after exercise than an untrained person.
Q6: Describe three long-term effects of exercise on the muscular system.
✅ Answers
- Heart rate increases, stroke volume increases, cardiac output increases, blood pressure increases, blood is redirected to working muscles.
- DOMS (Delayed Onset Muscle Soreness) is muscle pain and stiffness that develops 24-72 hours after exercise. It is caused by micro-tears in muscle fibres, particularly from eccentric contractions or unaccustomed activity. It is NOT caused by lactic acid.
- Cardiac hypertrophy is the increase in size (and strength) of the heart muscle, particularly the left ventricle, due to regular aerobic training. Bradycardia is a resting heart rate below 60 bpm, which is a result of cardiac hypertrophy - because the heart is larger and stronger, it pumps more blood per beat (increased SV), so it needs to beat fewer times per minute to maintain the same cardiac output at rest.
- Capillarisation (increased capillary network around the heart and muscles) improves performance by increasing the surface area for gaseous exchange, allowing more efficient delivery of oxygen and glucose to working muscles and faster removal of carbon dioxide and lactic acid.
- A trained athlete recovers faster because: cardiac hypertrophy means a stronger heart can pump more blood per beat; increased capillarisation improves oxygen delivery and waste removal; the body is more efficient at breaking down lactic acid; the parasympathetic nervous system is more effective at reducing heart rate; and higher myoglobin and mitochondria levels speed up aerobic recovery processes.
- Hypertrophy (increase in muscle fibre size and force production); increased number of mitochondria (more sites for aerobic energy production); increased myoglobin content (more oxygen stored in muscles); increased glycogen and PC stores; increased tolerance to lactic acid.
🎯 Exam Tips
- Always categorise effects as immediate, short-term or long-term - examiners check this
- DOMS is caused by micro-tears, NOT lactic acid - this is a very common trick question
- Link cardiac hypertrophy and bradycardia - one causes the other
- Use precise terminology: "capillarisation" not "more blood vessels"
- When asked about long-term effects, link each adaptation to its sporting benefit
- Know the difference between hypertrophy (muscle growth) and hyperplasia (increase in cell number) - GCSE focuses on hypertrophy
⚠️ Common Errors
Watch Out!
Students often say DOMS is caused by lactic acid. Wrong: "DOMS is caused by lactic acid build-up in the muscles." Correct: "DOMS is caused by microscopic tears (micro-tears) in muscle fibres, particularly from eccentric contractions."
Students often confuse immediate and long-term effects. Wrong: "An immediate effect of exercise is cardiac hypertrophy." Correct: "Cardiac hypertrophy is a long-term adaptation to regular training, not an immediate effect."
📝 Exam Technique
PE Exam Tips — Short and Long Term Effects of Exercise:
1. For Short and Long Term Effects of Exercise questions, use subject-specific terminology precisely
2. Support every point with specific evidence or examples
3. Show balanced analysis — consider different perspectives before reaching a conclusion
4. Link your understanding of Short and Long Term Effects of Exercise to real-world contexts where possible
5. For longer answers, plan your response to address all parts of the question
1. For Short and Long Term Effects of Exercise questions, use subject-specific terminology precisely
2. Support every point with specific evidence or examples
3. Show balanced analysis — consider different perspectives before reaching a conclusion
4. Link your understanding of Short and Long Term Effects of Exercise to real-world contexts where possible
5. For longer answers, plan your response to address all parts of the question
⚠️ Common Errors
Watch Out!
Students often think lactic acid causes doms. Wrong: Lactic acid causes DOMS Correct: DOMS (delayed onset muscle soreness) is caused by micro-tears in muscle fibres, not lactic acid. Lactic acid is cleared within an hour of exercise.
Students often think veins always carry deoxygenated blood. Wrong: Veins always carry deoxygenated blood Correct: Pulmonary veins carry oxygenated blood from the lungs to the heart. It is arteries and veins relative to the heart that matters, not oxygenation.
Students often think the heart beats faster during exercise just because you need more oxygen. Wrong: The heart beats faster during exercise just because you need more oxygen Correct: Heart rate increases due to anticipatory rise (before exercise), increased CO2 in blood detected by chemoreceptors, and decreased vagal tone. It is a coordinated response, not just oxygen demand.
✍️ Model Answer
Full-Mark Response
6 marks: Explain how short and long term effects of exercise affects sporting performance.
Short and Long Term Effects of Exercise has significant effects on sporting performance. [Key concept 1]: explain the mechanism with specific detail. [Key concept 2]: how this applies in a named sporting example. [Key concept 3]: the relationship between this topic and overall performance. A grade 9 answer uses precise anatomical/physiological terminology, specific sporting examples, and evaluates the relative importance of different factors.
Mark scheme: 2 marks per explained point with specific evidence, evaluation for top marks
📊 AO Deep Dive
Assessment Objective Analysis
GCSE PE tests four AOs: AO1 (Knowledge, 30%) — recall facts about Short and Long Term Effects of Exercise including definitions, classifications and specific examples; AO2 (Application, 30%) — apply knowledge to sporting contexts and training scenarios; AO3 (Analysis and Evaluation, 25%) — analyse data (graphs, tables), evaluate training methods or strategies, and justify recommendations; AO4 (Practical, 15%) — demonstrate relevant skills. For grade 9, use precise terminology, support every point with named sporting examples, and evaluate rather than just describe. The difference between grade 5 and grade 9 is the quality of application and depth of evaluation.
📝 Exam Questions by Topic
🎬 Video Resources
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