The short and long term effects of exercise — AQA GCSE Physical Education

This topic covers what happens to the body while a person is actually exercising, as opposed to the recovery period afterwards or the changes built up over months of training. During exercise the working muscles demand more oxygen and fuel, so the heart rate and breathing rate rise, breathing becomes deeper, and the body redirects blood flow towards the muscles. Body temperature climbs, so the skin flushes and sweating begins as the body tries to cool itself. Learners should be able to pick out these immediate, during-exercise responses from a list and separate them from long-term adaptations such as a lower resting heart rate or muscle hypertrophy, which develop only after repeated training.

This statement focuses on the skin changes seen during exercise: the skin becomes hot, sweaty and red. Working muscles release heat as they use energy, so body temperature rises and the skin feels hot. Sweat glands produce sweat, which cools the body as it evaporates. Blood vessels near the skin surface widen (vasodilation) so more blood flows close to the skin, which makes the skin look red and helps release heat. Learners should recognise these three linked skin responses as immediate effects of exercise and explain the cooling purpose behind sweating and redness, rather than confusing them with long-term adaptations.

During exercise the respiratory system responds immediately, and this statement names two separate changes: depth of breathing (tidal volume, the amount of air moved per breath) and frequency of breathing (breathing rate, breaths per minute). Both rise because working muscles demand more oxygen for aerobic respiration and produce more carbon dioxide, which the body must remove. The brain detects rising carbon dioxide in the blood and signals the diaphragm and intercostal muscles to contract more forcefully and more often. Depth increases first as tidal volume grows, then frequency climbs as exercise intensity rises. A useful method is to compare resting values (about 12-20 breaths per minute, tidal volume around 0.5 dm³) with exercising values, where both figures are higher. Learners must keep the two changes distinct rather than treating them as one effect.

Heart rate is the number of times the heart beats per minute. During exercise it rises above the resting value, typically from around 60-80 beats per minute at rest towards higher exercising values depending on intensity. The increase happens because working muscles need more oxygen delivered and more carbon dioxide carried away, so the heart must pump more blood around the body each minute. Cardiac output equals heart rate multiplied by stroke volume, so a higher heart rate raises the volume of blood circulated. The brain and chemoreceptors detect the changing blood composition and signal the heart to beat faster. Learners should treat increased heart rate as a short-term response to exercise and recognise that regular training lowers resting heart rate as a long-term effect.

Short-term effects are what a performer notices in the hours after exercise, up to about 36 hours. They differ from the immediate responses during exercise, such as a raised heart rate, faster breathing and sweating, which are not the same as short-term effects. AQA's short-term effects include feeling nauseous, headaches, aching muscles, delayed onset muscle soreness (DOMS), lightheadedness and cramp. DOMS typically appears a day or two after unfamiliar or strenuous work and eases with light activity. When answering, check the time frame: if the question says up to 36 hours after exercise, choose a post-exercise effect rather than a during-exercise response.

Tiredness, also called fatigue, is a short-term effect of exercise that occurs up to 36 hours afterwards. During exercise the muscles use up stores of energy and produce waste products, and the body works hard to supply oxygen and remove carbon dioxide and heat. This leaves you feeling tired and less able to perform at your best. Fatigue is a normal response and is reversible: with rest, food and fluid, energy stores are replaced and waste products are removed, so the feeling fades. Recognise fatigue as a short-term effect rather than a long-term training adaptation, and understand that it signals the body needs recovery before the next session.

Light headedness is a short-term effect some performers notice during or just after exercise. It means a feeling that you might faint or that your head feels unsteady, and it is linked to changes in blood flow and blood pressure as the body works harder. During intense exercise blood is redirected to the working muscles, and if a performer stops suddenly, or exercises in heat, blood pressure can drop briefly and reduce blood flow to the brain. Recognise it as a short-term response rather than a long-term adaptation such as a lower resting heart rate. In an MCQ, match the term to the correct description and to the correct category of effect.

Nausea is a short-term effect of exercise, meaning a feeling of sickness or an urge to vomit during or soon after activity. It can occur when exercise is very intense, when a performer exercises soon after eating, or when the body is hot and blood is redirected to the working muscles and away from the digestive system. Treat nausea as a temporary response to exercise rather than a long-term adaptation such as increased muscle size or a lower resting heart rate. In an MCQ, match the term to the correct description and to the correct category of effect, and rule out options that describe long-term training changes.

This row covers three short-term muscular after-effects of exercise: aching, delayed onset muscle soreness (DOMS) and cramp. Aching is general muscle discomfort felt soon after unaccustomed or strenuous work. DOMS appears roughly 24 to 72 hours after exercise, peaks over the next day or two and settles within a few days; it follows unfamiliar or high-intensity loading, especially eccentric work such as downhill running or lowering a weight slowly, and is linked to micro-damage and inflammation in muscle rather than to a single cause. Cramp is a sudden, involuntary, painful contraction that usually lasts seconds to minutes and often affects the calf or hamstring during or just after activity; fatigue, dehydration and electrolyte loss are commonly cited contributors.

This row covers adaptations that build up over months and years of regular exercise, as distinct from the immediate short-term responses to a single session. Long-term training effects include cardiac hypertrophy, which raises stroke volume so resting and submaximal heart rates fall; increased capillarisation and red blood cell production, which improve oxygen transport; greater mitochondrial density and oxidative enzyme activity, which raise aerobic endurance; stronger tendons and ligaments and increased bone density; muscle hypertrophy with resistance training; and improved body composition with reduced resting blood pressure. These changes are reversible if training stops. In an MCQ, look for the word long-term or months and years, then choose the adaptation rather than a short-term response such as increased heart rate during exercise.

Long-term exercise changes body shape because the body adapts to repeated demand. Regular aerobic work lowers stored fat, so the waist and hips can narrow and the limbs look leaner. Regular resistance work enlarges muscle, so the shoulders, chest, arms and thighs can look fuller and more defined. The two effects combine: a performer who trains for endurance and strength often looks slimmer at the waist yet broader across the upper body. Body shape is also influenced by diet, age, sex and genetics, so exercise is one factor rather than a guarantee. In an MCQ, choose the option that names a genuine long-term structural change, such as reduced fat mass or increased muscle size, and reject options describing short-term responses such as sweating, flushing or a temporary rise in heart rate.

Long-term exercise improves particular components of fitness, and the component improved depends on the training performed. Regular continuous running raises cardiovascular endurance, so the heart and lungs deliver oxygen more efficiently and the performer sustains aerobic work for longer. Repeated sprint or interval work raises speed and anaerobic power. Resistance training raises muscular strength and muscular endurance, depending on the load and repetitions used. Stretching and mobility work raise flexibility. The principle of specificity explains this: the body adapts to the exact demand placed on it, so a swimmer improves swimming fitness more than running fitness. In an MCQ, match the training described in the stem to the component it would most improve, and reject options naming a component that the training would not develop.

Muscle strength is the maximum force a muscle group can produce in one effort, so building it means training the muscle to overcome a heavier resistance than usual. In the long term, regular resistance work such as lifting weights, using resistance machines or doing body-weight exercises like press-ups causes the muscles to adapt by growing (hypertrophy), so they can generate more force. This is a long-term effect of exercise, not something felt during a single session. A learner should be able to pick out the activity and adaptation that build strength, for example heavy low-repetition lifting, and distinguish it from training that mainly improves endurance or flexibility.

Muscular endurance is the ability of a muscle group to keep contracting repeatedly, or to hold a contraction, over a period of time without tiring. Improving it means training the muscles to resist fatigue, typically through high-repetition, lower-resistance work such as circuit training, continuous swimming or repeated body-weight exercises. In the long term the muscles adapt so they can sustain effort for longer. This is a long-term effect of exercise rather than a change felt during one session. A learner should be able to select the training method and the adaptation that improve muscular endurance, and separate it from strength training, which uses heavier loads and fewer repetitions.

Speed is the ability to move the whole body, or part of it, quickly. Regular exercise improves speed through long-term adaptation: the neuromuscular system recruits fast-twitch (type II) muscle fibres more efficiently, so the same movement is produced with faster and more forceful contractions. Training that improves speed must be specific and progressive, for example repeated short sprints with full recovery, plyometric bounding, or high-intensity interval work. Learners should link the effect to the type of training and to the component of fitness it develops, and should distinguish a long-term improvement in speed from the short-term responses during a single session, such as increased heart rate, breathing rate and body temperature.

Suppleness, also called flexibility, is the range of movement possible at a joint. Regular exercise improves suppleness through long-term adaptation: stretching and full-range movements lengthen muscle and connective tissue and increase the range at the joint. Training that improves suppleness must be specific and progressive, for example static stretching held for a sustained period, dynamic stretching before activity, or PNF stretching with a partner. Learners should link the improvement to the type of training and to the component of fitness it develops, and should distinguish a long-term gain in flexibility from short-term responses during a session, such as increased muscle temperature and greater temporary range of movement.

Cardiovascular endurance is the ability of the heart, blood vessels and lungs to supply oxygen to working muscles over a sustained period. Training builds it by repeatedly raising heart rate and breathing rate for long enough to stress the aerobic system, so the heart muscle thickens, stroke volume rises and cardiac output at a given intensity increases. Continuous methods such as steady running, cycling or swimming for 20 minutes or more at moderate intensity, and interval or fartlek work, are typical. The long-term effect is a lower resting heart rate and quicker recovery, which lets a performer keep going at the same pace for longer.

Stamina, often used as another name for cardiovascular endurance, is the capacity to keep exercising for a prolonged period without tiring. Improving it means training the aerobic system regularly so the body delivers oxygen to muscles more efficiently. Continuous training such as jogging, rowing or cycling for at least 20 minutes at a moderate intensity, plus interval and fartlek sessions, raises stroke volume and cardiac output and lowers resting heart rate. Over weeks the performer sustains the same workload with less breathlessness and recovers faster, which is the observable sign that stamina has improved.

Regular aerobic training places a sustained volume load on the heart, and the cardiac muscle adapts by growing larger. This long-term adaptation is called hypertrophy: the walls of the ventricles, especially the left ventricle, thicken and the chamber can hold and eject more blood. A larger, stronger heart produces a greater stroke volume, so it delivers more oxygenated blood per beat to working muscles. Hypertrophy is a long-term effect that develops over weeks and months of consistent training, not a short-term response during a single session. Distinguish it from a short-term rise in heart rate during exercise, which is an immediate response, and from cardiac muscle becoming more efficient without changing size.

Consistent aerobic training strengthens the heart so that each beat ejects more blood (a greater stroke volume). Because more blood is pumped per beat, the heart needs fewer beats per minute to circulate the same volume, so the resting heart rate falls. A resting heart rate below the normal range is described as bradycardia, and in a trained performer this is a beneficial long-term adaptation rather than a sign of illness. This adaptation builds over weeks and months of regular training and is measured when the body is at rest, for example on waking. Distinguish it from the short-term rise in heart rate during exercise and from the faster recovery of heart rate after exercise.

This row is course guidance, not an assessed answer target. It tells you to learn the components of fitness (for example cardiovascular endurance, muscular endurance, muscular strength, flexibility, speed, power, agility, balance, coordination and reaction time) and then use them as a lens for the long term effects of exercise. The link works both ways: regular training develops particular components, and the body adapts over time in ways that show up in those same components. A concrete method is to build a two-column table. In the left column name a component; in the right column state the long term adaptation that supports it, such as a lower resting heart rate supporting cardiovascular endurance or increased muscular strength following resistance work. Read the specification section alongside your class notes so you can explain each adaptation in terms of the component it improves.