Lesson 8 · Principles, adaptations and performance
Physiological adaptations to training
A trained endurance athlete's resting heart rate can sit in the low forties. That is not a curiosity or a party trick. It is a direct, visible consequence of a heart that has learned to move more blood with each beat, and it is the clearest evidence you will ever see that a principle of training became a structural change in a body.
Two people are lying still on a bed. One has a resting heart rate of 72 beats per minute. The other, a trained cyclist, has 44. Both are alive, comfortable, and delivering enough oxygen to their tissues.
If the cyclist's heart beats 28 fewer times a minute, something else must have changed to keep the total blood delivery the same. Write down what you think it is, and then predict what happens to both people's heart rates during identical light exercise.
- State the relationship between heart rate, stroke volume and cardiac output, and use it to explain resting bradycardia.
- Describe adaptations in oxygen uptake and lung capacity, and say which of the two actually limits performance.
- Explain adaptations in haemoglobin level and blood volume, including why concentration can appear to fall.
- Explain muscle hypertrophy and the different adaptations of fast and slow twitch fibres.
- Examine the relationship by tracing a chain from a principle of training, through an adaptation, to a performance outcome.
- Heart rate — beats per minute.
- Stroke volume — the volume of blood ejected by the left ventricle in one beat.
- Cardiac output — the volume of blood ejected per minute, equal to heart rate multiplied by stroke volume.
- Bradycardia — a slow resting heart rate; in a trained athlete this is an adaptation rather than a disorder.
- Maximal oxygen uptake — the greatest rate at which the body can take in, transport and use oxygen.
- Vital capacity — the greatest volume of air that can be exhaled after a maximal inhalation.
- Haemoglobin — the protein in red blood cells that carries oxygen.
- Hypertrophy — an increase in the size of muscle fibres.
- Slow twitch fibres — type I fibres, fatigue resistant, rich in mitochondria and capillaries, suited to sustained work.
- Fast twitch fibres — type II fibres, contracting rapidly and forcefully but fatiguing quickly.
- Capillarisation — an increase in the number of capillaries supplying a trained muscle.
Almost everything examinable about cardiovascular adaptation follows from one relationship: cardiac output equals heart rate multiplied by stroke volume. Learn it as a sentence rather than a formula and it will answer questions you have not seen before.
Endurance training thickens and strengthens the wall of the left ventricle and increases the volume of its chamber, so it fills more completely and ejects more forcefully. Stroke volume rises. At rest the body needs a roughly fixed cardiac output, so if each beat now delivers more blood, fewer beats are required. That is the answer to card 01: resting heart rate falls because stroke volume has risen, and the product of the two is unchanged.
| State | Untrained | Trained | What has changed |
|---|---|---|---|
| At rest | Heart rate about 72, stroke volume moderate | Heart rate 45 to 55, stroke volume high | Cardiac output unchanged, because the body's resting oxygen requirement has not changed. Only the split between the two variables has. |
| Submaximal exercise, same absolute workload | High heart rate for that workload | Noticeably lower heart rate for the identical workload | Cardiac output is again the same, because the task demands the same oxygen. The trained athlete meets it with fewer, larger beats and so works further below their ceiling. |
| Maximum | Maximum heart rate similar; stroke volume lower | Maximum heart rate similar or slightly lower; stroke volume much higher | Maximum cardiac output is substantially higher, and this is a direct cause of higher maximal oxygen uptake. |
Two things students routinely get wrong. Maximum heart rate does not rise with training; it is largely determined by age and changes little, so an answer claiming training raises it is incorrect. And heart rate recovery after exercise becomes faster with training, which is a separate and easily observed adaptation.
Training does not make the heart beat faster. It makes each beat bigger, so fewer beats are needed for the same job and more beats are available for a harder one.
Quick check: A trained cyclist has a resting heart rate of 44 while an untrained person of the same size has 72. The best explanation is that the cyclist's:
Maximal oxygen uptake is the headline endurance measure, and it rises with aerobic training. It is worth knowing why. Oxygen uptake depends on how much oxygenated blood the heart can deliver and on how much oxygen the muscle can extract from it. Training improves both ends: maximum cardiac output rises, as in card 04, and the trained muscle extracts more oxygen because it has more capillaries, more mitochondria and more aerobic enzymes.
Lung capacity is where a genuinely useful distinction lives. Vital capacity and total lung volume change relatively little with training. What improves is the efficiency of breathing: tidal volume rises, respiratory rate at a given submaximal workload falls, the respiratory muscles become stronger and more fatigue resistant, and gas exchange at the alveoli improves through greater pulmonary capillary perfusion. In healthy people at sea level, the lungs are not the limiting factor in endurance performance; delivery by the cardiovascular system and extraction by the muscle are. An answer that says training greatly increases lung size is repeating a common misconception.
Haemoglobin carries a trap of its own. Endurance training raises total blood volume, and plasma volume rises first and proportionally more than red cell mass. So a trained athlete has more total haemoglobin and therefore greater total oxygen-carrying capacity, while their measured haemoglobin concentration can be normal or even slightly low. This is sometimes called athlete's pseudoanaemia, and it is a dilution effect rather than a deficiency. The greater plasma volume is itself useful: blood is less viscous, so it flows more easily, and there is more fluid available for sweating and temperature regulation.
Three claims to avoid
Training does not substantially increase lung size or vital capacity. Training does not raise maximum heart rate. A lower haemoglobin concentration in a trained endurance athlete is not automatically a deficiency, because total haemoglobin and total blood volume have both risen. Each of these is a common answer and each is wrong.
Ask what actually limits the system. In a healthy person at sea level, oxygen delivery and extraction limit endurance performance, not the size of the lungs. Adaptations occur where the limit is.
True or false: A trained endurance athlete can have a normal or slightly low haemoglobin concentration while still carrying more total haemoglobin than an untrained person, because plasma volume has risen proportionally more than red cell mass.
Hypertrophy is an increase in the size of existing muscle fibres, driven by the mechanical tension and metabolic stress of resistance training, and it raises the force the muscle can produce. Two points matter for a precise answer. Hypertrophy is an increase in fibre size, not in fibre number. And the first four to eight weeks of a beginner's strength gain come largely from neural adaptation, better recruitment, firing rate and coordination between muscles, before measurable size change occurs. That is why a beginner gets stronger quickly while looking much the same.
| Slow twitch, type I | Fast twitch, type II | |
|---|---|---|
| Contraction speed | Slower | Fast |
| Force produced | Lower | Higher |
| Fatigue resistance | High | Low |
| Mitochondria and capillaries | Many | Fewer |
| Main energy pathway | Aerobic | Anaerobic |
| Recruited for | Sustained submaximal work and posture | Sprinting, jumping, heavy lifting |
| Responds to | Aerobic training, with more mitochondria, more capillaries and greater aerobic enzyme activity | Anaerobic and heavy resistance training, with greater hypertrophy and improved recruitment |
The honest statement about fibre type is that the proportion of slow to fast twitch fibres is largely genetically determined and is not substantially changed by training. What training changes is the characteristics within each type, and there is evidence of shifting between fast twitch subtypes. An answer claiming training converts slow twitch fibres into fast twitch ones is overstating the evidence considerably.
This connects directly to specificity from Lesson 6. Fibres adapt to the way they are recruited. Heavy or explosive work recruits fast twitch fibres and produces hypertrophy and better recruitment in them; sustained submaximal work recruits slow twitch fibres and produces aerobic adaptations in them. The same muscle trained two ways gives two different adaptations.
Fill the gaps. Cardiac output is heart rate multiplied by . An increase in the size of existing muscle fibres is called . Fibres that resist fatigue, contain many mitochondria and suit sustained work are called fibres.
The verb here is examine the relationship, and the relationship is a three-link chain: a principle is applied, which produces an adaptation, which improves performance. Listing adaptations without the links either side answers a different question.
| Principle applied | Adaptation produced | Performance outcome |
|---|---|---|
| Progressive overload of aerobic volume, worked between the two thresholds | Left ventricle chamber enlarges and its wall strengthens, so stroke volume rises; capillary density and mitochondrial number in trained muscle increase | Maximum cardiac output and maximal oxygen uptake rise, and any given race pace now sits at a lower percentage of maximum, so it can be held for longer |
| Specificity, training near the anaerobic threshold | Improved lactate clearance and buffering, and the threshold occurs at a higher percentage of maximal oxygen uptake | The athlete sustains a faster pace before accumulating disturbance, which decides the closing stages of a race |
| Progressive overload of load in resistance training above the strength threshold | Neural adaptation first, then hypertrophy of fast twitch fibres | Greater maximal force, so a heavier scrum, a longer throw, a faster first step |
| Reversibility, breached by a ten-week complete break | Plasma and stroke volume fall within two weeks, aerobic capacity substantially within eight; strength and skill largely retained | Performance falls, and injury risk rises on return because retained skill lets the athlete attempt what their conditioning cannot support |
Notice the last row. Reversibility is a principle too, so the chain runs in both directions. Being able to trace it backwards, from a performance decline to the adaptation lost to the principle breached, is what an examine question rewards.
Never name an adaptation on its own. Name the training that caused it and the performance it changes. Three links, every time, and the middle one alone is worth about a third of the marks.
Two truths and a lie. One of these statements about physiological adaptation is false. Find it.
These adaptations are also the measurements coaches use to check that a program is working, which returns this lesson to the assessment cycle of Lesson 2. Four are practical to monitor, and each has a trap.
| Measure | Expected direction with aerobic training | The trap |
|---|---|---|
| Resting heart rate | Falls | Also raised by illness, dehydration, poor sleep and accumulated fatigue, so a rise is a signal to investigate rather than proof of anything; measure it at the same time of day, on waking |
| Submaximal heart rate at a fixed workload | Falls | Only interpretable if the workload really is fixed, which returns to the protocol standardisation of Lesson 2 |
| Heart rate recovery after a standard effort | Becomes faster | Sensitive to ambient temperature and to how hard the preceding effort actually was |
| Haemoglobin concentration | May be unchanged or slightly lower | Reads as a decline when total oxygen-carrying capacity has in fact risen, because plasma volume rose proportionally more |
The general point is worth stating plainly. A physiological measure is evidence about a system, not a verdict on a program. It is interpreted against a standardised protocol, against the athlete's own history, and alongside what the athlete reports and what the coach observes. A single number moving in the wrong direction is a question, not an answer.
Activities · trace the chain
Each row below gives you one link. Supply the other two, in the order principle, adaptation, performance.
Adaptation given: the left ventricle chamber enlarges and its wall strengthens.
Principle given: progressive overload of load in resistance training, above the strength threshold, over twelve weeks.
Performance given: the athlete's usual training run now feels easy and their heart rate no longer rises above 65 per cent of maximum during it.
Adaptation given: plasma volume has risen proportionally more than red cell mass.
Match each term to its meaning.
- Stroke volume
- Cardiac output
- Hypertrophy
- Capillarisation
- The volume of blood ejected by the left ventricle in one beat
- The volume of blood ejected per minute, equal to heart rate multiplied by stroke volume
- An increase in the size of existing muscle fibres
- An increase in the number of capillaries supplying a trained muscle
A 19-year-old distance runner is monitored across a sixteen-week aerobic block. All measurements are taken on waking or under the same standardised submaximal protocol.
| Measure | Week 0 | Week 8 | Week 16 |
|---|---|---|---|
| Resting heart rate, beats per minute | 64 | 56 | 59 |
| Heart rate at a fixed 12 km per hour, beats per minute | 168 | 152 | 151 |
| Heart rate recovery, fall in the first minute after a standard effort | 22 | 31 | 26 |
| Haemoglobin concentration, grams per litre | 151 | 144 | 143 |
| Reported sleep quality, out of 10 | 7 | 7 | 4 |
Answer four things. Which measures show a genuine adaptation by week 8, and what adaptation does each indicate? Why is the fall in haemoglobin concentration not evidence of a problem? What has changed between weeks 8 and 16, and which principle from Lessons 6 and 7 does it point to? Finally, name one further piece of information you would want before acting, and say what decision it would change.
Lock it in. In one sentence, explain why a lower heart rate at the same fixed submaximal workload is evidence of adaptation, even though the workload demanded exactly the same amount of oxygen on both occasions.
Examine the relationship between the principles of training, the physiological adaptations they produce, and improved performance.
Examine asks you to inspect the relationship closely. The stem names three things in a chain, so the answer must connect them rather than describe each.
Plan: establish the chain, inspect the cardiovascular adaptations, inspect the muscular adaptations, then show where the chain can break.
The relationship is causal and sequential. A principle of training determines the stimulus applied; the stimulus disturbs homeostasis and produces a specific physiological adaptation; and the adaptation raises performance only where the quality it improves is the one limiting that athlete's event.
Aerobic training applied at or above the aerobic threshold, progressively overloaded, produces central adaptations: the left ventricle enlarges so stroke volume rises, which increases cardiac output at maximal effort and lowers both resting and submaximal heart rate for the same workload. Total blood volume and total haemoglobin rise, so more oxygen is carried, and capillary density increases so more of it is delivered to the working muscle. Two of the syllabus terms need stating carefully: haemoglobin concentration can be normal or even slightly low in a trained endurance athlete, because plasma volume expands proportionally more than red cell mass, so it is total haemoglobin rather than concentration that rises; and lung capacity changes little, since what improves is the efficiency of breathing rather than the size of the lungs. Maximal oxygen uptake nevertheless rises, because delivery and extraction both improve, and performance rises because the athlete can sustain a higher intensity before the aerobic system is exceeded.
Resistance training applied with progressive overload and specificity produces peripheral adaptations: muscle hypertrophy increases cross-sectional area and therefore maximal force, while neural adaptations improve motor unit recruitment and firing rate. Training also shifts the functional characteristics of fast twitch fibres toward the demand imposed, so endurance work increases their oxidative capacity while power work emphasises their contractile speed. Performance rises where the sport is limited by force or by rate of force development.
The relationship is not automatic, and inspecting its failures shows why the principles matter. Where intensity sits below threshold no adaptation is signalled, so training occurs without improvement. Where specificity is ignored, real adaptations are produced in a quality that is not limiting, so physiology improves while performance does not. And under reversibility the adaptations decay when the stimulus is withdrawn, at different rates for aerobic and strength qualities.
The inspection therefore shows a chain in which each link is conditional: the principles govern whether an adaptation occurs at all, the adaptation determines what physiological capacity changes, and the athlete's event determines whether that capacity change is visible as performance.
The relationship is causal and sequential: a principle of training determines the stimulus applied, the stimulus disturbs homeostasis and produces a specific physiological adaptation, and the adaptation raises performance only where the quality it improves is the one limiting that athlete's event. Aerobic training at or above the aerobic threshold, progressively overloaded, produces central adaptations — the left ventricle enlarges so stroke volume rises, increasing maximal cardiac output and lowering resting and submaximal heart rate for the same workload, while total blood volume and total haemoglobin rise and capillary density increases so more oxygen is carried and delivered; haemoglobin concentration may nonetheless be normal or slightly low, because plasma volume expands proportionally more than red cell mass, and lung capacity itself changes little, since it is breathing efficiency rather than lung size that improves, while maximal oxygen uptake rises because delivery and extraction both do — and performance rises because a higher intensity can be sustained before the aerobic system is exceeded. Resistance training with progressive overload and specificity produces peripheral adaptations: hypertrophy increases cross-sectional area and therefore maximal force, neural adaptations improve motor unit recruitment and firing rate, and training shifts the functional characteristics of fast twitch fibres toward the demand imposed, so endurance work raises their oxidative capacity while power work emphasises contractile speed. The relationship is not automatic, and its failures show why the principles matter: below threshold no adaptation is signalled, so training occurs without improvement; where specificity is ignored real adaptations occur in a quality that is not limiting, so physiology improves while performance does not; and under reversibility adaptations decay when the stimulus is withdrawn, at different rates for aerobic and strength qualities. The chain is therefore conditional at every link — the principles govern whether adaptation occurs, the adaptation determines which capacity changes, and the event determines whether that change is visible as performance.
Explain why a trained athlete has a lower resting heart rate than an untrained person.
Explain asks for the mechanism. The answer is a short causal chain and the marks are for stating every link in it, not for length.
Plan: name the principle, follow the chain from adaptation to resting heart rate, then answer directly.
The body's requirement at rest is fixed: a certain volume of blood must be delivered each minute to meet resting metabolic demand. Cardiac output is the product of stroke volume and heart rate, so if the required output is constant and stroke volume rises, heart rate must fall.
Sustained aerobic training increases the volume of blood returning to the heart, and the left ventricle responds by enlarging its chamber and strengthening its wall, so it fills with and ejects a greater volume with each contraction — an increase in stroke volume.
Because resting cardiac output does not change, the heart delivering more blood per beat needs fewer beats to deliver the same volume, so resting heart rate falls — a state described as bradycardia in trained athletes.
Training also shifts autonomic balance toward greater parasympathetic and reduced sympathetic influence on the sinoatrial node, so the intrinsic rate is slowed further, which means the adaptation is both structural and neural rather than mechanical alone.
At rest the body's requirement is fixed: a certain volume of blood must be delivered each minute to meet resting metabolic demand. Since cardiac output is the product of stroke volume and heart rate, a constant required output combined with a rise in stroke volume necessarily means heart rate falls. Sustained aerobic training increases the volume of blood returning to the heart, and the left ventricle responds by enlarging its chamber and strengthening its wall, so it fills with and ejects a greater volume with each contraction. Because resting cardiac output is unchanged, a heart delivering more blood per beat needs fewer beats to deliver the same volume, so resting heart rate falls — the athletic bradycardia characteristic of endurance-trained individuals. Training additionally shifts autonomic balance toward greater parasympathetic and reduced sympathetic influence on the sinoatrial node, slowing the intrinsic rate further, so the adaptation is both structural and neural. The lower resting heart rate is therefore not itself a benefit but a visible consequence of a more efficient heart, and the same adaptation is what raises maximal cardiac output during exercise.
Go back to card 01. The thing that must have changed is stroke volume, and the product of heart rate and stroke volume is the same in both people at rest. Did you also predict correctly for light exercise? Both people need the same cardiac output for the same workload, so the cyclist meets it at a much lower heart rate, and is therefore working at a far lower percentage of their maximum. Write down what that means for how long each of them could keep going.
Multiple choice · 5 questions
MC 1. Cardiac output is equal to:
- A. stroke volume divided by heart rate
- B. heart rate multiplied by haemoglobin concentration
- C. heart rate multiplied by stroke volume
- D. maximal oxygen uptake divided by heart rate
MC 2. Which change does not normally occur as a result of endurance training?
- A. maximum heart rate rises substantially
- B. resting heart rate falls
- C. stroke volume rises
- D. capillary density in trained muscle increases
MC 3. A trained endurance athlete's blood test shows a haemoglobin concentration slightly below the reference range. The most likely explanation is that:
- A. the athlete has an iron deficiency requiring immediate treatment
- B. endurance training destroys red blood cells faster than they can be replaced
- C. haemoglobin is not involved in oxygen transport during exercise
- D. plasma volume has risen proportionally more than red cell mass, diluting the concentration while total haemoglobin has risen
MC 4. Much of the strength gain in a beginner's first six weeks of resistance training is due to:
- A. an increase in the number of muscle fibres
- B. neural adaptation, including improved recruitment and coordination
- C. conversion of slow twitch fibres into fast twitch fibres
- D. an increase in vital capacity
MC 5. An athlete's heart rate at a fixed submaximal workload has fallen from 168 to 152 over eight weeks. This is best explained by:
- A. a rise in stroke volume, so the same cardiac output is achieved with fewer beats
- B. a fall in the oxygen required by that workload
- C. a rise in maximum heart rate
- D. a reduction in the athlete's total blood volume
Short answer · exam style
SA 1. Understand Band 4 Using the relationship between heart rate, stroke volume and cardiac output, explain why a trained athlete has a lower resting heart rate than an untrained person. (4 marks)
SA 2. Analyse Band 5 Describe the adaptations that occur in muscle as a result of aerobic training and as a result of resistance training, and explain how each improves performance. (5 marks)
SA 3. Evaluate Band 6 Examine the relationship between the principles of training, physiological adaptations and improved performance. Use two complete examples, and in one of them show the relationship operating in reverse. (6 marks)
📖 Comprehensive answers (click to reveal)
Multiple choice: 1 → C. 2 → A. 3 → D. 4 → B. 5 → A.
Activity 1, indicative answers: 1 → Principle: progressive overload applied to aerobic volume, worked between the aerobic training threshold and the anaerobic threshold, over a sustained period. Performance: stroke volume rises, so maximum cardiac output and maximal oxygen uptake rise, and any given pace sits at a lower percentage of maximum and can therefore be held for longer. 2 → Adaptation: neural adaptation first, improved recruitment, firing rate and coordination, followed by hypertrophy of fast twitch fibres. Performance: greater maximal force, so a heavier scrum, a longer throw or a faster first step, depending on the sport. 3 → Adaptation: the athlete has adapted, so a fixed absolute workload now represents a smaller relative demand and elicits a lower heart rate. Principle now needed: progressive overload, because the run has fallen below the athlete's now-higher aerobic training threshold and no longer provides a stimulus. 4 → Principle: sustained aerobic training, which raises total blood volume with plasma rising first and proportionally more than red cell mass. Performance: greater total oxygen-carrying capacity, lower blood viscosity so blood flows more easily, and more fluid available for sweating and temperature regulation. A blood test would misleadingly show a haemoglobin concentration that is unchanged or slightly reduced, which reads as anaemia but is a dilution effect.
Activity 2, indicative answers: By week 8 three measures show genuine adaptation. Resting heart rate has fallen from 64 to 56, indicating a rise in stroke volume, since resting cardiac output is unchanged. Heart rate at a fixed 12 km per hour has fallen from 168 to 152, the strongest single piece of evidence here because the workload is standardised, so the same oxygen demand is being met at a lower heart rate. Heart rate recovery has improved from 22 to 31 beats in the first minute, indicating improved cardiovascular and autonomic function. The fall in haemoglobin concentration from 151 to 144 is not evidence of a problem: aerobic training raises total blood volume with plasma rising proportionally more than red cell mass, so total haemoglobin and total oxygen-carrying capacity have risen while the concentration is diluted. Between weeks 8 and 16 the picture changes. Fixed-workload heart rate has stalled at 151, but resting heart rate has risen from 56 to 59, recovery has worsened from 31 to 26, and reported sleep quality has dropped from 7 to 4. Together these point to accumulated fatigue outrunning recovery, which is progressive overload breached at its upper failure mode rather than at the plateau end. A useful further piece of information would be the actual training load across weeks 8 to 16, or whether the athlete has been unwell, or a record of life stress and nutrition. If load has risen sharply, the decision is to reduce volume while protecting intensity for a recovery week; if the athlete has been ill, the decision is to hold and let them recover; the two look identical in the numbers and lead to different actions.
SA 1 (4 marks): State the relationship: cardiac output equals heart rate multiplied by stroke volume [1]. Name the adaptation: endurance training enlarges the left ventricle chamber and strengthens its wall, so it fills more completely and ejects more forcefully, raising stroke volume [1]. Apply it: the body's resting oxygen requirement is unchanged, so the required resting cardiac output is unchanged [1]; therefore if each beat ejects more blood, fewer beats per minute are needed, and resting heart rate falls [1]. A response that names the adaptation without using the relationship to explain the consequence earns about half.
SA 2 (5 marks): Aerobic adaptations [2]: increased capillary density around trained muscle, increased number and size of mitochondria, increased aerobic enzyme activity and increased myoglobin, principally in slow twitch fibres [1]; these improve the muscle's ability to extract and use oxygen, so a given pace requires a smaller fraction of maximum and can be sustained for longer [1]. Resistance adaptations [2]: neural adaptation, then hypertrophy, an increase in the size of existing fibres rather than in their number, and predominantly in fast twitch fibres [1]; this increases maximal force production, improving performance in sprinting, jumping, throwing and contact [1]. A fifth mark for precision about fibre type [1]: the proportion of slow to fast twitch fibres is largely genetically determined and is not substantially changed by training, so what training alters is the characteristics within each type, which is also why specificity determines which adaptation is obtained.
SA 3 (6 marks): Three marks per example, and the top band requires the reverse case. A forward example [3]: progressive overload of aerobic volume between the two thresholds [1] enlarges the left ventricle and raises stroke volume while increasing capillary density and mitochondrial number in trained muscle [1], so maximum cardiac output and maximal oxygen uptake rise and race pace sits at a lower percentage of maximum, allowing it to be held for longer [1]. A reverse example [3]: a ten-week complete break breaches reversibility [1], and plasma and stroke volume fall within one to two weeks with a substantial part of aerobic capacity lost within eight, while strength is retained longer and skill longest of all [1], so performance declines and injury risk rises on return because the athlete's retained skill lets them attempt work their conditioning can no longer support [1]. A strong response also makes a judgement about the relationship itself: it is a causal chain in which the middle link explains the other two, so an adaptation named without its cause or its consequence answers only a third of the question, and the chain traverses in both directions.
This lesson completes the second inquiry question of the focus area. Lessons 3 to 5 gave you the methods, Lessons 6 and 7 the principles, and this lesson the adaptations those principles produce and the performance changes that follow.
The single most useful revision artefact from these six lessons is the three-column chain: principle, adaptation, performance. Fill one row for every sub-point and you have a page that answers most of what this inquiry question can ask. Lessons 9 onward move to designing sessions and programs, where all of this is applied.
Mark lesson as complete
Tick when you've finished the practice and review.