2023 IB DP Sports, Exercise and Health Science Practice Paper with Answers

At the onset of exercise, the rapid initial increase in heart rate (up to approximately 100 beats per minute) is primarily due to the withdrawal of parasympathetic (vagal) tone. Sympathetic activation and hormonal influences (such as adrenaline) contribute to further increases in heart rate at higher exercise intensities.

Award [1] for the correct answer: A. Parasympathetic withdrawal is the immediate neural mechanism for heart rate elevation at the start of exercise.

To maximize muscle glycogen resynthesis immediately after exercise, high glycemic index (GI) carbohydrates should be consumed. High-GI foods cause a rapid rise in blood glucose and a subsequent spike in insulin, which activates glycogen synthase, the primary enzyme responsible for glycogen storage.

Award [1] for the correct option: B. High-GI carbohydrates are optimal for rapid post-exercise glycogen replenishment.

Topspin causes the top of the ball to rotate in the direction of the oncoming air, which opposes the airflow and decreases the relative air velocity on top. According to Bernoulli's principle, lower fluid velocity leads to higher pressure. Thus, a high-pressure zone is created on top, while a low-pressure zone is created underneath where the ball surface rotates in the same direction as the airflow (increasing velocity). This pressure difference creates a downward force, curving the ball down.

Award [1] for the correct option: B. Lower velocity on top creates high pressure on top, pushing the ball down.

A key limitation of twin studies is the 'equal environments assumption' (EEA), which assumes that monozygotic (MZ) and dizygotic (DZ) twins experience highly similar environments. If MZ twins are treated more similarly than DZ twins, this can lead to an overestimation of the genetic contribution (heritability) to a trait.

Award [1] for the correct option: B. The assumption of equal environmental sharing is a prominent limitation of twin designs.

During a biceps curl, the effort (biceps insertion) is located between the fulcrum (elbow joint) and the load (dumbbell). This configuration defines a third-class lever. Third-class levers always have a mechanical advantage of less than 1 (effort arm is shorter than the load arm), which prioritizes range of motion and speed over force production.

Award [1] for the correct option: B. Biceps curl is a third-class lever with a mechanical advantage of less than 1.

A positively accelerating curve is characterized by slow initial progress followed by a rapid, sudden acceleration in performance improvement as the performer begins to grasp the complex task mechanics.

Award [1] for the correct option: B. Positively accelerating curve depicts slow start and rapid acceleration.

The Inverted-U Hypothesis states that optimal performance occurs at moderate levels of arousal. However, this optimal point shifts depending on skill level and task complexity. Novices and those performing highly complex/fine-motor tasks perform best at lower levels of arousal, whereas elite athletes and those performing simple/gross-motor tasks perform best at higher levels of arousal.

Award [1] for the correct option: B. Novices and high-complexity tasks shift the optimal performance point to a lower level of arousal.

Intrinsic motivation refers to engaging in an activity for its inherent satisfaction, enjoyment, and interest, rather than for some separable consequence or external reward.

Award [1] for the correct option: A. Participation for pleasure, inherent interest, and internal satisfaction is defined as intrinsic motivation.

During prolonged exercise in a warm environment, sweat loss reduces plasma volume, which decreases venous return and end-diastolic volume. Consequently, stroke volume (SV) decreases. To maintain a constant cardiac output \(Q = HR \times SV\), heart rate (HR) must increase. This phenomenon is known as cardiovascular drift.

Award 1 mark for the correct answer A: Heart rate increases, stroke volume decreases, and cardiac output remains relatively constant.

Active inspiration involves the contraction of the diaphragm (which moves downwards) and external intercostal muscles (which move the ribs up and out). This increases the overall volume of the thoracic cavity, lowering the intrapulmonary pressure below atmospheric pressure, and causing air to flow into the lungs down the pressure gradient.

Award 1 mark for the correct answer C: Contraction of the diaphragm and external intercostals leads to increased thoracic volume and decreased pressure.

Saturated fatty acids contain only single bonds between carbon atoms in their hydrocarbon chain, meaning they are fully saturated with hydrogen atoms. Unsaturated fatty acids contain one or more double bonds in their carbon chain.

Award 1 mark for the correct answer B: Saturated fatty acids contain only single bonds, while unsaturated fatty acids contain one or more double bonds.

Glycogen is a polysaccharide of glucose that serves as a form of energy storage in animals. The two primary storage sites in the human body are the liver and skeletal muscle tissue.

Award 1 mark for the correct answer C: Liver and skeletal muscle.

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. If the sprinter exerts a force of 800 N backward on the block, the block must exert an equal and opposite force of 800 N forward on the sprinter.

Award 1 mark for the correct answer A: The block exerts a force of 800 N forward on the sprinter.

Extrinsic feedback is information provided by an external source (the coach and video). Knowledge of Performance (KP) is feedback about the pattern of movement or technique itself (body alignment during flight) rather than the ultimate outcome or score of the movement.

Award 1 mark for the correct answer B: Extrinsic feedback and Knowledge of Performance (KP).

Abilities are largely genetically determined, stable, and enduring traits that underpin performance (e.g., coordination, reaction time). Skills are goal-directed, learned behaviors developed through practice and experience, built upon these underlying abilities.

Award 1 mark for the correct answer B: Abilities are stable and enduring traits, whereas skills are developed through practice and experience.

During the upward phase of a bicep curl, the biceps brachii contracts concentrically to lift the weight. In a concentric contraction, the muscle active tension overcomes the resistance, resulting in the shortening of the muscle.

Award 1 mark for the correct answer C: Concentric contraction, where the muscle shortens.

During prolonged submaximal exercise in a warm environment, dehydration from sweat loss decreases blood volume, which reduces venous return and stroke volume. To maintain a constant cardiac output, the heart rate increases proportionally. Thus, heart rate increases, stroke volume decreases, and cardiac output remains relatively constant.

Award 1 mark for selecting A. Heart rate increases, stroke volume decreases, and cardiac output remains relatively constant.

Tidal volume is the volume of air inspired or expired with each normal breath. Inspiratory reserve volume is the extra volume that can be inspired above tidal volume. Residual volume is the air remaining in the lungs after maximal expiration. Vital capacity is the maximum volume of air that can be exhaled after a maximal inhalation.

Award 1 mark for selecting B. Tidal volume is the correct volume of air inhaled/exhaled per normal breath.

Skeletal muscle has the largest total storage of glycogen (typically around 300 to 400 grams in an average adult), followed by the liver (about 75 to 100 grams), and finally blood glucose (about 3 to 5 grams). Therefore, the correct order is Skeletal muscle glycogen > Liver glycogen > Blood glucose.

Award 1 mark for selecting B. Skeletal muscle glycogen > Liver glycogen > Blood glucose.

Dehydration leads to a loss of body mass due to fluid loss. The kidneys conserve water, resulting in more concentrated urine, which is characterized by a high urine specific gravity, high osmolarity, and dark-coloured urine.

Award 1 mark for selecting B. High urine specific gravity, dark-coloured urine, and decreased body mass are key indicators of dehydration.

In a concentric biceps curl, the elbow joint acts as the fulcrum, the insertion of the biceps tendon on the radius acts as the effort, and the weight of the forearm/hand (and any dumbbell) acts as the load. Since the effort is applied between the fulcrum and the load, it is a third-class lever.

Award 1 mark for selecting C. Third class lever; the effort is located between the fulcrum and the load.

When calcium ions bind to troponin, it causes a conformational change in tropomyosin, shifting it away from the myosin-binding sites on the actin filament, allowing myosin heads to bind and form cross-bridges.

Award 1 mark for selecting B. Tropomyosin shifts position, exposing the myosin-binding sites on actin.

An endomorph somatotype is characterized by high fat storage, wide hips, and a rounder body contour, with a tendency to gain fat easily. Mesomorphs are characterized by high muscularity, and ectomorphs by slenderness.

Award 1 mark for selecting C. Endomorph.

Intrinsic feedback is the sensory information that is a natural consequence of producing a movement, such as feeling the impact or vibrations (proprioception). Extrinsic feedback is provided by external sources like a coach or video replay.

Award 1 mark for selecting A. Intrinsic feedback represents internal sensory information.

During inhalation, air enters through the nasal cavity, passes through the pharynx (throat), then the larynx (voice box), and flows down into the trachea (windpipe). From the trachea, the airway splits into the left and right primary bronchi, which branch further into smaller bronchioles within the lungs.

Award [1] for the correct option (A).

In untrained individuals, stroke volume increases during progressive exercise up to about 40–60% of \(VO_2\text{max}\), after which it plateaus. Further increases in cardiac output beyond this point are met primarily by increases in heart rate.

Award 1 mark for selecting option b (correct answer). Award 0 marks for any other response.

As exercise duration increases, muscle glycogen stores deplete, and the body progressively relies more on circulating blood glucose and plasma free fatty acids (lipids) for ATP production.

Award 1 mark for selecting option a (correct answer). Award 0 marks for any other response.

A calf raise acts as a second-class lever. The pivot/fulcrum is at the ball of the foot (metatarsophalangeal joints), the load (body weight) is applied through the middle (tarsus/ankle joint), and the effort (force generated by gastrocnemius) is applied at the back of the heel through the Achilles tendon.

Award 1 mark for selecting option b (correct answer). Award 0 marks for any other response.

The autonomous stage is characterized by highly consistent, automatic execution with minimal conscious cognitive control, allowing the performer to focus on environmental factors or fine-tuning details.

Award 1 mark for selecting option c (correct answer). Award 0 marks for any other response.

In the sliding filament cycle, the binding of a new ATP molecule to the myosin head causes it to detach from the actin filament. Hydrolysis of this ATP then "cocks" the myosin head for the next attachment.

Award 1 mark for selecting option b (correct answer). Award 0 marks for any other response.

Somatotype ratings are given in the order: Endomorphy - Mesomorphy - Ectomorphy. A rating of 1-7-2 indicates very low endomorphy (1), high mesomorphy (7), and low ectomorphy (2). Thus, the athlete is highly muscular/athletic (mesomorphic) with low body fat (endomorphy) and low linearity (ectomorphy).

Award 1 mark for selecting option d (correct answer). Award 0 marks for any other response.

Somatic anxiety refers to the physical symptoms of anxiety, such as sweating, elevated heart rate, and muscle tension. Cognitive anxiety refers to mental symptoms like worry and self-doubt, which are absent in this scenario.

Award 1 mark for selecting option b (correct answer). Award 0 marks for any other response.

Intrinsic motivation is defined as engaging in an activity for its inherent satisfaction, enjoyment, and personal fulfillment, rather than for some separable consequence or external reward.

Award 1 mark for selecting option b (correct answer). Award 0 marks for any other response.

(a) There is an inverse relationship between heart rate and stroke volume; as stroke volume increases, heart rate decreases to maintain a stable cardiac output at a constant workload.

(b) Pre-training cardiac output: \(\dot{Q} = 155 \times 110 = 17,050\text{ mL/min}\) (or 17.05 L/min). Post-training cardiac output: \(\dot{Q} = 138 \times 125 = 17,250\text{ mL/min}\) (or 17.25 L/min). Acceptable units are L/min or mL/min.

(c) The training program led to an increase in submaximal stroke volume from 110 mL to 125 mL. This is explained by: 1. Increased left ventricular volume / cavity dimension (eccentric cardiac hypertrophy), allowing for a larger end-diastolic volume (EDV). 2. Plasma volume expansion, which enhances venous return (preload) and stretch of the myocardium. 3. Increased myocardial contractility (Frank-Starling law), enabling a more complete ejection and a lower end-systolic volume (ESV).

(d) During maximal exercise, a trained individual has a much higher maximal cardiac output (up to 30–40 L/min) compared to an untrained individual (around 20–22 L/min). This difference is entirely due to the trained individual's significantly larger maximal stroke volume, since maximal heart rate is similar (or slightly lower) in trained compared to untrained individuals.

(a) [1] 1 mark for stating the inverse relationship/compensatory mechanism.

(b) [2] 1 mark for both correct calculations (17.05 L/min and 17.25 L/min; accept 17,050 and 17,250 mL/min). 1 mark for the correct units (L/min or mL/min).

(c) [3] 1 mark per explanation point (max 3):
- Increased left ventricular volume / cavity size.
- Increased blood/plasma volume leading to increased venous return / preload.
- Enhanced contractility / stroke force (Frank-Starling mechanism).
- Lower end-systolic volume (ESV) / more complete emptying.

(d) [2] 1 mark for stating trained individuals have a higher maximal cardiac output. 1 mark for attributing the difference to higher maximal stroke volume (while max HR is similar/unchanged).

(a) The marathon runner has a higher carbohydrate requirement (8.5 g/kg/day versus 4.0 g/kg/day). Marathon running is a prolonged aerobic activity that relies heavily on aerobic glycolysis, requiring high muscle glycogen stores to sustain performance. In contrast, weightlifters rely primarily on the anaerobic energy pathways (ATP-PC and anaerobic glycolysis) for short, explosive actions, requiring less total daily carbohydrate.

(b) The weightlifter requires more protein (2.0 g/kg/day vs 1.4 g/kg/day) to support muscle hypertrophy, repair structural damage (microtears) caused by heavy resistance training, and maintain a positive nitrogen balance. The marathon runner still requires a elevated protein intake (1.4 g/kg/day) relative to sedentary levels to support mitochondrial biogenesis, enzymatic adaptations, and repair of repetitive muscle damage.

(c) The marathon runner's urine osmolarity is higher (580 mOsm/kg), indicating mild hypohydration / more concentrated urine. The weightlifter's urine osmolarity is lower (320 mOsm/kg), indicating euclycemia / well-hydrated status. Another method to monitor hydration is tracking changes in body mass (pre- vs. post-exercise) or using a urine color chart.

(d) Lipids (fatty acids) are a high-yield, slow-release energy source used during prolonged, low-intensity exercise via aerobic beta-oxidation, helping to spare glycogen stores.

(a) [2] 1 mark for identifying the marathon runner. 1 mark for linking it to aerobic glycolysis, glycogen depletion, or exercise duration.

(b) [2] 1 mark for explaining the weightlifter's higher need for muscle hypertrophy and repair of microtears. 1 mark for explaining the runner's need for cellular/mitochondrial protein synthesis and tissue repair.

(c) [3] 1 mark for analyzing the marathon runner as mildly dehydrated/hypohydrated. 1 mark for analyzing the weightlifter as well-hydrated. 1 mark for suggesting another valid method (e.g., body weight loss, urine color chart, or urine specific gravity).

(d) [1] 1 mark for outlining that lipids provide high energy yields / spare glycogen via beta-oxidation at low intensities.

(a) Impulse is defined as the product of the force applied and the time interval over which it acts (Force \\times Time). Its SI unit is the Newton-second (N s) or kilogram meter per second (kg m/s).

(b) Newton's 1st Law (Inertia): The athlete remains in horizontal motion until the takeoff foot exerts a force against the ground to alter this motion. Newton's 2nd Law (Acceleration): The upward acceleration achieved at takeoff is directly proportional to the force applied to the ground and inversely proportional to the athlete's body mass (\(F = ma\)). Newton's 3rd Law (Action-Reaction): The athlete exerts a downward and backward force on the ground (action), and the ground exerts an equal and opposite upward and forward force on the athlete (reaction), propelling them into the air.

(c) Angular momentum (\(L\)) is the product of moment of inertia (\(I\)) and angular velocity (\(\omega\)), represented as \(L = I \times \omega\). While in the air, angular momentum remains constant (conserved) because there is no external torque. Therefore, if the jumper increases their moment of inertia (e.g., by extending limbs), their angular velocity must decrease, and vice versa.

(d) During the Fosbury Flop, the high jumper arches their back over the bar so that their body segments curl around it. This extreme arched posture shifts the average distribution of mass, causing the center of mass to lie outside (below) the arch of the body.

(a) [2] 1 mark for defining impulse (Force \\times time or change in momentum). 1 mark for stating the correct unit (N s or kg m/s).

(b) [3] 1 mark for applying the 1st Law (need for external force to change state of motion). 1 mark for applying the 2nd Law (relating force, mass, and acceleration). 1 mark for applying the 3rd Law (action-reaction force pair between foot and ground).

(c) [2] 1 mark for defining the relationship (\(L = I \times \omega\) / angular momentum is product of moment of inertia and angular velocity). 1 mark for explaining conservation of momentum (inverse relationship between \(I\) and \(\omega\) while airborne).

(d) [1] 1 mark for outlining that the arched/curved body position over the bar projects the center of mass below the physical segments of the body.

(a) Male soccer players had a higher sweat rate than female soccer players by 0.40 L/h (1.45 L/h for males vs 1.05 L/h for females).

(b) 1. Sweat gland response: Females generally have a higher density of active sweat glands but produce less sweat per gland compared to males. 2. Surface-area-to-mass ratio: Females typically have a higher surface-area-to-mass ratio, which benefits heat dissipation in moderate conditions but can increase heat absorption in hot environments. 3. Body composition: Females average a higher body fat percentage, which acts as insulation and retards heat loss compared to males.

(c) The hypothalamus acts as the body's thermostat. It senses changes in core blood temperature via central thermoreceptors and receives signals from cutaneous/peripheral thermoreceptors. It coordinates responses by sending autonomic signals to dilate skin blood vessels (vasodilation) and activate sweat glands to promote cooling.

(d) Radiation and conduction (accept convection or evaporation).

(a) [1] 1 mark for stating that males have a higher sweat rate / females have a lower sweat rate (or calculating the difference of 0.40 L/h).

(b) [3] 1 mark per factor discussed (max 3):
- Females produce less sweat per gland despite having high sweat gland density.
- Females generally have higher body fat, which limits heat transfer/dissipation.
- Females have a larger surface-area-to-mass ratio which affects radiative/convective heat exchange depending on ambient temperature.
- Estrogen/progesterone fluctuations in females can affect baseline core temperature and the sweating threshold.

(c) [2] 1 mark for stating its role as a sensor/thermostat detecting core and skin temperatures. 1 mark for outlining the effector response (cutaneous vasodilation and sweat gland activation).

(d) [2] 1 mark for each correct mechanism (radiation, conduction, convection, evaporation) up to 2 marks.

(a) It is a third-class lever (where the effort force of the biceps insertion is situated between the elbow fulcrum and the dumbbell load). Its mechanical advantage is less than 1 (mechanical disadvantage), which means a greater muscle force must be applied than the load being lifted, but it allows for a larger range of motion and greater speed of movement.

(b) 1. The action potential arrives at the neuromuscular junction, causing acetylcholine (ACh) release, depolarizing the sarcolemma. 2. The depolarization travels down the T-tubules, triggering the release of calcium ions (\(\text{Ca}^{2+}\)) from the sarcoplasmic reticulum. 3. Calcium binds to troponin, shifting tropomyosin to expose the active binding sites on the actin filament. 4. Myosin heads bind to the exposed actin sites, forming cross-bridges, and undergo the power stroke (releasing ADP + Pi) to pull actin towards the center of the sarcomere.

(c) Isometric contraction: Muscle tension is generated but muscle length remains unchanged (e.g., holding the dumbbell static at a 90-degree elbow angle). Isotonic contraction: Muscle length changes under a constant tension; this includes concentric (muscle shortens, e.g., upward phase of biceps curl) and eccentric (muscle lengthens under tension, e.g., lowering phase of biceps curl).

(a) [2] 1 mark for identifying the third-class lever. 1 mark for explaining mechanical advantage (less than 1 / sacrifices force to gain speed/range of motion).

(b) [4] 1 mark per step described in chronological sequence (max 4):
- Action potential reaches NMJ and triggers ACh release / depolarizes sarcolemma.
- T-tubules conduct signal, releasing calcium from sarcoplasmic reticulum.
- Calcium binds to troponin, moving tropomyosin to expose active actin sites.
- Myosin head binds to actin (cross-bridge) and performs the power stroke.

(c) [2] 1 mark for isometric (constant muscle length under tension, with sporting example/holding static). 1 mark for isotonic (changing muscle length, identifying both shortening/concentric and lengthening/eccentric during curl).

(a) Transfer of learning is the influence or application of previously practiced skills or experiences on the learning or performance of a new skill, or the same skill in a new environment/context.

(b) Group B practiced using a random schedule, which creates high contextual interference. Although contextual interference depresses performance during the acquisition phase because learners must constantly adjust and reconstruct movement plans, it forces deeper cognitive processing and more active problem-solving. This results in stronger retention and successful transfer to a novel or game-like environment. Group A (blocked practice) relied on rote repetition, which produces rapid performance improvements in training but does not foster the deep cognitive processing required for long-term learning and transfer.

(c) Massed practice features long training sessions with little or no rest between trials, whereas distributed practice spaces trials out with distinct rest intervals (or alternative activities) that are equal to or longer than the practice duration. Distributed practice is more appropriate for novices as it prevents physical and mental fatigue, and allows time for cognitive rehearsal and feedback processing.

(d) In the cognitive stage of learning, the performer lacks an established internal reference of correctness and cannot accurately detect their own errors. Therefore, they rely heavily on extrinsic (external) feedback from the coach or visual aids. This feedback should be simple, immediate, and prescriptive to help the novice form the basic cognitive map/schema of the movement.

(a) [1] 1 mark for a correct definition of transfer of learning (effect of prior experience on new performance/context).

(b) [3] 1 mark for explaining that random practice creates high contextual interference. 1 mark for explaining that this interference encourages deeper cognitive processing / motor program reconstruction. 1 mark for explaining that blocked practice only results in temporary performance gains but poorer long-term learning/adaptation.

(c) [2] 1 mark for distinguishing massed (continuous, low rest) from distributed (spaced, high rest) practice. 1 mark for selecting distributed practice and justifying it for novice learners (e.g., reduces fatigue, allows cognitive processing time).

(d) [2] 1 mark for stating that novices rely heavily on extrinsic feedback / lack intrinsic error detection. 1 mark for outlining that the feedback should be simple, clear, and action-oriented to construct the motor plan.

Part a: At rest, only about 15 to 20 percent of cardiac output is directed to skeletal muscle, with the majority of blood flow going to visceral organs such as the kidneys, liver, and digestive tract, as well as the brain. During maximal exercise, overall cardiac output increases dramatically, and up to 80 to 85 percent of this blood flow is redirected to the active skeletal muscles. Blood flow to the skin increases to facilitate heat dissipation, while flow to the kidneys, liver, and digestive tract is significantly reduced. Absolute blood flow to the brain is maintained, though its percentage of the total cardiac output decreases. Part b: The redistribution of blood flow is controlled by both neural and chemical mechanisms. The sympathetic nervous system is activated during exercise, releasing catecholamines (adrenaline and noradrenaline) which cause general vasoconstriction in non-essential tissues like the kidneys and splanchnic organs. Simultaneously, local metabolic factors (autoregulation) such as decreased oxygen, increased carbon dioxide, increased lactic acid (hydrogen ions), nitric oxide, and increased temperature trigger vasodilation of arterioles feeding the active skeletal muscles. Precapillary sphincters in non-active tissues contract to restrict flow, while those in active muscles relax to enhance perfusion. The muscle pump and venoconstriction also aid venous return to support the increased cardiac output. Part c: A six-month aerobic endurance training program leads to substantial cardiovascular adaptations. First, cardiac hypertrophy occurs, specifically an increase in the left ventricular cavity size and wall thickness, which increases stroke volume at rest and during exercise. Consequently, resting heart rate decreases (bradycardia) because the larger stroke volume can maintain resting cardiac output at a lower heart rate. Submaximal heart rates also decrease, while maximal heart rate remains largely unchanged or decreases slightly. Maximal cardiac output increases due to the enhanced stroke volume. Blood volume increases, including both plasma volume and red blood cell count, enhancing oxygen transport capacity. Capillary density in trained skeletal muscles increases, shortening the diffusion distance for oxygen. Finally, the arterio-venous oxygen difference (a-v O2 diff) increases, indicating greater oxygen extraction by active muscles.

Part a (Max 4 marks): Award 1 mark for noting resting blood flow to muscles is low (15-20%). Award 1 mark for noting resting blood flow to visceral organs/kidneys/liver is high. Award 1 mark for stating that during maximal exercise, blood flow to active muscles increases to 80-85%. Award 1 mark for stating that blood flow to kidneys/liver/digestive tract is reduced during exercise. Award 1 mark for noting brain blood flow is maintained. Part b (Max 7 marks): Award 1 mark for identifying the role of the autonomic/sympathetic nervous system. Award 1 mark for explaining sympathetic vasoconstriction in non-essential tissues. Award 1 mark for explaining local vasodilation in active muscles. Award 1 mark for identifying local chemical factors/metabolic autoregulation (accept examples: CO2, O2, pH, nitric oxide). Award 1 mark for explaining the role of precapillary sphincters (closing in non-active tissues, opening in active tissues). Award 1 mark for mentioning the muscle pump or venoconstriction assisting venous return. Award 1 mark for linking redistribution to the need to deliver oxygen/nutrients and remove waste from working muscles. Part c (Max 9 marks): Award 1 mark for cardiac hypertrophy (specifically left ventricle enlargement). Award 1 mark for increased stroke volume (at rest, submaximal, and maximal). Award 1 mark for decreased resting heart rate (bradycardia). Award 1 mark for decreased submaximal heart rate. Award 1 mark for increased maximal cardiac output. Award 1 mark for increased plasma volume / blood volume. Award 1 mark for increased capillarization/capillary density in skeletal muscles. Award 1 mark for increased arterio-venous oxygen difference (a-v O2 diff). Award 1 mark for lower resting or submaximal blood pressure. (Accept other valid physiological adaptations up to 9 marks total).

Part a: In the cognitive stage, the learner is trying to understand the basic requirements, rules, and movement patterns of the skill, which requires high conscious cognitive processing. In contrast, in the autonomous stage, movements are highly automatic, requiring very little conscious attention. Cognitive stage performances are highly inconsistent with frequent, large errors, whereas autonomous stage performances are highly consistent, fluid, and efficient. Learners in the cognitive stage rely heavily on external feedback, whereas learners in the autonomous stage can effectively utilize internal (proprioceptive) feedback to detect and self-correct minor errors. Part b: Intrinsic feedback (sensory information from muscles, joints, and balance) helps autonomous performers feel the movement and self-correct. Extrinsic feedback (provided by a coach, teammate, or video) is vital for cognitive learners who cannot yet self-evaluate. Knowledge of Results (KR), which focuses on the outcome of the movement, helps learners understand if the movement objective was met. Knowledge of Performance (KP), which focuses on the actual movement characteristics and technique, helps learners refine their motor patterns. Positive feedback reinforces successful movement trials and builds confidence/motivation. Negative/corrective feedback highlights errors, which is necessary to prevent bad habits. Concurrent feedback (during performance) allows immediate adjustments, while terminal feedback (after performance) gives learners time to process information and prepare for the next trial. Part c: Welford's model outlines how sensory information is received, processed, and translated into action. In a fast-paced team sport, selective attention acts as a filter in the sensory registry, choosing relevant cues (such as the position of the ball, opponents, and open space) while ignoring irrelevant cues (such as crowd noise, stadium lights, or opponent trash-talk). This prevents overloading the short-term memory (STM), which has a limited capacity (about 7 items) and duration (up to 30 seconds). The STM is the working space where active decision-making occurs. To make quick decisions, the STM retrieves stored motor programs and past experiences from the long-term memory (LTM), which has an unlimited capacity and duration. Through practice, these motor programs are chunked and well-established in the LTM, allowing the performer to rapidly execute skills without conscious delay, reducing reaction time and cognitive load.

Part a (Max 4 marks): Award 1 mark for stating cognitive requires high conscious attention whereas autonomous requires little to none. Award 1 mark for stating cognitive performance is inconsistent/error-prone whereas autonomous is consistent/smooth. Award 1 mark for stating cognitive relies on external/extrinsic feedback whereas autonomous relies on internal/intrinsic feedback. Award 1 mark for stating cognitive focuses on understanding the rules/mechanics whereas autonomous focuses on tactics/environmental cues. Part b (Max 7 marks): Award 1 mark for explaining intrinsic feedback (sensory/feeling) and its benefit. Award 1 mark for explaining extrinsic feedback (coach/video) and its benefit. Award 1 mark for explaining Knowledge of Results (KR) and how it assesses outcomes. Award 1 mark for explaining Knowledge of Performance (KP) and how it addresses technique. Award 1 mark for explaining positive feedback (reinforcement/motivation). Award 1 mark for explaining negative/corrective feedback (error correction). Award 1 mark for explaining the difference/benefits of concurrent versus terminal feedback. Part c (Max 9 marks): Award 1 mark for explaining the role of selective attention (filtering relevant from irrelevant cues). Award 1 mark for giving an example of relevant cues (ball, teammates) vs irrelevant cues (crowd noise). Award 1 mark for explaining that selective attention prevents information overload of the short-term memory. Award 1 mark for identifying short-term memory (STM) as the working/decision-making space. Award 1 mark for stating STM has limited capacity (7 plus/minus 2 items) or limited duration. Award 1 mark for identifying long-term memory (LTM) as the storehouse for motor programs and past experiences. Award 1 mark for stating LTM has unlimited capacity/duration. Award 1 mark for explaining the retrieval process from LTM to STM to formulate a response. Award 1 mark for explaining how practice leads to better 'chunking' or automation of information, speeding up decision-making.

(a) Acute physiological responses to altitude:
- Hyperventilation: Lower partial pressure of oxygen (\(PO_2\)) triggers peripheral chemoreceptors to increase breathing rate and depth.
- Increased resting and submaximal heart rate: Occurs to compensate for reduced arterial oxygen content, maintaining oxygen delivery to tissues.
- Decreased stroke volume: Due to a reduction in plasma volume caused by hyperventilation and respiratory water loss.
- Increased cardiac output at rest and submaximal exercise: Driven by the elevated heart rate to meet baseline tissue oxygen demands.

(b) Chronic physiological adaptations to altitude:
- Increased Erythropoietin (EPO) secretion: Hypoxia stimulates the kidneys to release EPO, which stimulates red blood cell (erythrocyte) production in bone marrow, increasing hemoglobin concentration and total blood oxygen-carrying capacity.
- Increased capillarization: Capillary density in skeletal muscles increases, shortening the diffusion distance between blood vessels and active muscle fibers.
- Increased mitochondrial density: Enhances the muscle cells' capacity to produce energy aerobically through oxidative phosphorylation.
- Elevated myoglobin concentration: Increases the rate of oxygen transport from the cell membrane to mitochondria.
- Improved muscle buffering capacity: Enhances the muscle's ability to tolerate lactic acid buildup and maintain cellular pH during high-intensity efforts.

(c) Cardiovascular drift in hot, humid environments:
- Definition: Cardiovascular drift is characterized by a gradual, progressive increase in heart rate and a corresponding decrease in stroke volume during prolonged submaximal exercise, despite a constant workload.
- Thermoregulatory response: High ambient temperatures cause vasodilation of cutaneous blood vessels to dissipate heat via radiation and convection.
- Sweat rate: The body increases sweat production to encourage evaporative cooling. In humid environments, evaporation is limited, leading to continuous high sweating rates.
- Plasma volume reduction: Excessive sweating leads to fluid loss from the intravascular compartment, reducing total plasma volume and venous return (preload).
- Stroke volume decline: According to the Frank-Starling law, reduced venous return decreases end-diastolic volume, leading to a decline in stroke volume.
- Compensatory heart rate increase: To maintain a constant cardiac output (\(\text{Cardiac Output} = \text{Stroke Volume} \times \text{Heart Rate}\)), heart rate must rise as stroke volume falls.

(d) Evaluation of carbohydrate loading:
- Strengths/Pros:
- Maximizes muscle and liver glycogen stores, super-compensating up to 1.5–2 times normal levels.
- Delays the onset of fatigue (depletion of glycogen, often called 'hitting the wall') in endurance events lasting longer than 90 minutes.
- Enhances performance times and helps maintain a higher running pace for longer.
- Glycogen storage binds with water (approximately \(3\text{ g}\) of water per gram of glycogen), which can help maintain hydration levels early in the race.
- Limitations/Cons:
- Water retention can lead to an increase in body mass (typically 1–2 kg), potentially increasing the energy cost of running.
- Can cause gastrointestinal discomfort, bloating, or feelings of sluggishness during the initial stages of exercise.
- Not beneficial for short-duration or high-intensity explosive activities where glycogen depletion is not the limiting factor.
- Requires careful dietary planning and a taper phase, which some athletes find difficult to manage or execute correctly.

(a) [3 marks max]
Award [1] per valid acute response outlined, up to [3].
- Hyperventilation / increased ventilation rate and depth. [1]
- Increased resting and/or submaximal heart rate. [1]
- Decreased stroke volume (due to plasma volume loss). [1]
- Increased cardiac output at rest/submaximal workloads. [1]
- Decreased maximal heart rate and maximal cardiac output. [1]
- Decreased arterial oxygen saturation (\(SaO_2\)). [1]

(b) [6 marks max]
Award [1.5] marks per adaptation explained (up to 4 adaptations).
- Erythropoietin (EPO) secretion / increased red blood cell count / increased hemoglobin: increases the oxygen-carrying capacity of the blood. [1.5]
- Increased capillary density: reduces diffusion distance, enhancing oxygen and nutrient delivery to working muscles. [1.5]
- Increased mitochondrial density: improves the capacity for aerobic ATP production. [1.5]
- Increased myoglobin content: assists in the intracellular transport of oxygen. [1.5]
- Increased muscle buffering capacity: allows the athlete to tolerate higher acidic environments before fatiguing. [1.5]

(c) [8 marks max]
Award [1] per point up to [8].
- Define cardiovascular drift as a rise in heart rate and drop in stroke volume over time at a constant work rate. [1]
- Heat triggers sweat production for thermoregulation / cooling. [1]
- Prolonged sweating reduces blood plasma volume. [1]
- Reduced plasma volume leads to decreased venous return / end-diastolic volume. [1]
- Decreased venous return leads to a reduction in stroke volume (Frank-Starling law). [1]
- Vasodilation of cutaneous blood vessels (to lose heat) further reduces central blood volume. [1]
- To maintain cardiac output (\(Q = HR \times SV\)), heart rate must increase proportionally to compensate for the falling stroke volume. [1]
- Cardiovascular drift is more pronounced in humid environments where evaporation is impaired, leading to greater heat strain. [1]

(d) [8 marks max]
Award up to [4] for strengths/arguments in favor, and up to [4] for limitations/arguments against.
Strengths:
- Increases muscle glycogen stores to maximum capacity / supercompensation. [1]
- Delays onset of muscular fatigue / depletion of glycogen reserves. [1]
- Improves endurance performance in events lasting longer than 90 minutes. [1]
- Every gram of stored glycogen binds with \(3\text{ g}\) of water, providing a minor reservoir to combat dehydration. [1]

Limitations:
- Added body weight / water retention can increase energy expenditure during running. [1]
- May cause gastrointestinal issues / bloating / heaviness. [1]
- Irrelevant or offers no performance benefit for events lasting under 90 minutes. [1]
- Requires a tapering period which may cause anxiety in some athletes or disrupt training rhythm. [1]

(a) Distinguishing performance and learning:
- Performance: Is a temporary, observable behavior during a specific task execution. It can fluctuate due to transient variables such as fatigue, stress, motivation, or environmental conditions.
- Learning: Is a relatively permanent change in performance or capability resulting from practice or experience. It cannot be directly observed; instead, it must be inferred from consistent improvements in performance over time.

(b) Application of transfer concepts in football (soccer):
- Bilateral transfer: This refers to the transfer of learning of a skill from one limb to another (e.g., from the dominant leg to the non-dominant leg).
- Coach application: A coach should design drills where players practice passing, dribbling, or shooting with their preferred foot first to establish a neural pattern, and then immediately practice the exact same technique with their weaker foot. This speeds up skill acquisition on the weaker side.
- Zero transfer: This occurs when the learning of one skill has absolutely no effect or influence on the learning of another, because the two skills share no common elements.
- Coach application: A coach must recognize that practicing unrelated skills, such as swimming or heading a ball, will not transfer to dribbling ability. The coach should not expect a player who has excellent goalkeeper reflexes to automatically understand defensive tactical positioning, as these are independent domains.

(c) Contrasting Drive Theory vs Catastrophe Theory:
- Drive Theory:
- Proposes a linear relationship between arousal and performance.
- As arousal levels increase, the probability of executing the dominant response increases.
- For experienced athletes, the dominant response is typically correct, meaning performance continuously increases with high arousal.
- Catastrophe Theory:
- Proposes a multi-dimensional, non-linear relationship incorporating both somatic arousal and cognitive anxiety.
- Performance increases with arousal up to an optimal point, but only if cognitive anxiety is low.
- If cognitive anxiety is high and arousal increases past the threshold, performance does not gradually decline; instead, it suffers a sudden, dramatic drop (a 'catastrophe').
- Key contrasts:
- Drive theory is unidirectional and simple, whereas Catastrophe theory is multi-dimensional.
- Drive theory predicts peak performance at maximum arousal for experts, whereas Catastrophe theory predicts performance failure at extreme arousal when cognitive worry is present.
- Recovery in Drive theory is not structured, while Catastrophe theory states that to recover, an athlete must drastically reduce cognitive anxiety and somatic arousal before rebuilding performance.

(d) Designing a training program for a gymnastics routine:
- Presentation Types:
- Whole presentation: The coach demonstrates and has the gymnast practice the entire routine from start to finish. This is essential for understanding the overall flow, rhythm, and spatial awareness of the routine.
- Part presentation: Highly complex or dangerous elements (e.g., a double somersault) are isolated and practiced individually. This reduces cognitive overload and manages safety risk.
- Whole-part-whole presentation: The gymnast performs the routine, the coach identifies a weak transition or stunt, the gymnast practices just that isolated stunt (part), and then integrates it back into the complete routine (whole).
- Practice Types:
- Massed practice: Continuous practice with very short rest intervals. While good for highly automated skills, it is generally avoided for complex gymnastics due to high fatigue and safety risks.
- Distributed practice: Practice periods are interspersed with rest or low-intensity mental rehearsal. This is ideal for gymnastics to allow physical recovery, maintain high concentration levels, and prevent injury.
- Synthesis/Integration:
- An optimal program would combine distributed practice with a whole-part-whole structure. Gymnasts practice the whole routine initially, use distributed intervals to master difficult parts safely, and then stitch the skills back together.

(a) [3 marks max]
Award [1] for defining performance (temporary, fluctuates, observable). [1]
Award [1] for defining learning (permanent, stable, inferred). [1]
Award [1] for direct contrast/distinction between the two. [1]

(b) [6 marks max]
- Define bilateral transfer (transfer of learning from limb to limb). [1]
- Provide a practical football example of bilateral transfer (e.g., passing with left foot after mastering with right). [1]
- Describe how the coach designs a drill for this. [1]
- Define zero transfer (no relationship/effect between skills). [1]
- Provide a practical football example of zero transfer (e.g., heading skill does not improve kicking skill). [1]
- Describe how the coach applies this understanding (avoiding irrelevant drills for specific skill outcomes). [1]

(c) [8 marks max]
Award up to [3] for explaining Drive Theory:
- Linear relationship. [1]
- Dominant response increases with arousal. [1]
- Performance increases with arousal for experts/well-learned tasks. [1]
Award up to [3] for explaining Catastrophe Theory:
- Interaction of cognitive anxiety and physiological arousal. [1]
- Inverted-U shape only when cognitive anxiety is low; sudden drop when cognitive anxiety is high. [1]
- Extreme drop (catastrophe) rather than steady decline. [1]
Award up to [2] for direct contrasts:
- One-dimensional vs. Multi-dimensional model. [1]
- Gradual/linear outcome vs. Sudden performance collapse under stress. [1]

(d) [8 marks max]
Award up to [4] for application of Presentation methods (Whole, Part, Whole-part-whole):
- Explains Whole: helpful for flow/rhythm of routine. [1]
- Explains Part: reduces complexity/risk for difficult skills. [1]
- Explains Whole-Part-Whole: allows targeted correction and immediate reintegration. [1]
- Links presentation to gymnastics context. [1]
Award up to [4] for application of Practice methods (Massed, Distributed):
- Explains Massed: continuous work, risk of injury/fatigue in gymnastics. [1]
- Explains Distributed: recovery intervals, highly suited to safe skill execution in gymnastics. [1]
- Program synthesis: combining distributed intervals with part/whole-part-whole delivery to maximize skill learning and safety. [2]