📚 Year 13 CIE Physical Education: Unit Test Mock Paper Walkthrough | Year 13 CIE 体育：单元测试模拟卷解析
Welcome to this detailed walkthrough of a mock unit test for Year 13 CIE Physical Education. This practice paper focuses on the topic of Exercise Physiology, covering energy systems, muscle fibre types, training adaptations, and ergogenic aids. Each question is broken down with model answers, marking guidance, and examiner insights to strengthen your understanding and exam technique.
欢迎阅读这份Year 13 CIE体育单元测试模拟卷的详细解析。本练习卷聚焦运动生理学主题，涵盖能量系统、肌纤维类型、训练适应和运动补剂。每个问题都配有标准答案、评分指导和考官建议，以加深你的理解并提升应试技巧。
1. Understanding ATP and Coupled Reactions | 理解ATP与耦联反应
Question: Define the terms ‘adenosine triphosphate (ATP)’ and ‘coupled reactions’ in the context of energy production. (4 marks)
题目： 解释能量产生背景下“腺苷三磷酸(ATP)”和“耦联反应”两个术语的定义。(4分)
Model Answer: ATP is a high-energy molecule consisting of adenine, ribose and three phosphate groups. It acts as the universal energy currency of cells. When the terminal phosphate bond is hydrolysed by ATPase, energy is released (approx. 7.3 kcal/mol), forming ADP and an inorganic phosphate (P₁).
参考答案： ATP是由腺嘌呤、核糖和三个磷酸基团组成的高能分子，是细胞的通用能量货币。当末端磷酸键被ATP酶水解时，释放能量（约7.3 kcal/mol），生成ADP和一个无机磷酸(P₁)。
A coupled reaction pairs an exergonic reaction (e.g. ATP breakdown) with an endergonic reaction (e.g. myosin head power stroke). The energy released from ATP hydrolysis is directly transferred to drive a process that requires energy, preventing wasteful heat loss.
耦联反应将一个放能反应（如ATP分解）与一个吸能反应（如肌球蛋白头部的动力冲程）配对。ATP水解释放的能量被直接转移给需要能量的过程，避免了以热量形式浪费。
Examiner’s Note: Candidates must link the concept of energy transfer, not just define ATP. Mentioning ATPase and ‘immediate energy’ is key for top marks.
考官点评： 考生必须联系能量转移的概念，而不仅仅是定义ATP。提到ATP酶和“即时能量”是获得高分的关键。
2. ATP-PC System and the 100m Sprint | ATP-PC系统与百米冲刺
Question: Explain how the ATP-PC system provides energy during a 100m sprint. (6 marks)
题目： 解释ATP-PC系统是如何在100米短跑期间提供能量的。(6分)
Model Answer: At the onset of maximal exercise, ATP stores in muscles last only about 2 seconds. The ATP-PC system uses stored phosphocreatine (PC) to rapidly resynthesise ATP without oxygen. The enzyme creatine kinase catalyses the breakdown of PC into creatine and a phosphate group, donating that phosphate to ADP to form ATP.
参考答案： 在最大强度运动开始时，肌肉内的ATP储备仅能维持约2秒。ATP-PC系统利用储存的磷酸肌酸(PC)在无氧条件下快速再合成ATP。肌酸激酶催化PC分解为肌酸和一个磷酸基团，将该磷酸基团提供给ADP以形成ATP。
ADP + PC → ATP + Creatine
ADP + PC → ATP + 肌酸
This reaction is a single step, making it the fastest energy system. During a 10-second 100m sprint, the ATP-PC system dominates for the first 8-10 seconds. Once PC stores are depleted (limited to ~8 seconds), the glycolysis system takes over, but in a short sprint the ATP-PC pathway is the primary source.
该反应一步完成，是最快的能量系统。在10秒左右的100米冲刺中，ATP-PC系统在前8-10秒占主导。一旦PC储备耗尽（仅够约8秒），糖酵解系统接管，但在短距离冲刺中ATP-PC途径是主要来源。
Examiner’s Note: High-scoring answers name the enzyme, state the duration of the system, and link this to the specific demands of a 100m race.
考官点评： 高分答案会指出酶的名称，说明系统的持续时间，并将其与100米比赛的具体需求联系起来。
3. Comparing Slow Oxidative and Fast Glycolytic Fibres | 比较慢氧化与快糖酵解纤维
Question: Compare the structural and functional characteristics of slow oxidative (Type I) and fast glycolytic (Type IIb) muscle fibres. (8 marks)
题目： 比较慢氧化（I型）和快糖酵解（IIb型）肌纤维的结构与功能特点。(8分)
Model Answer: Type I fibres (slow oxidative) have a high myoglobin content, dense capillary network, and numerous mitochondria. They appear red, contract slowly (slow ATPase isoform), and exhibit high resistance to fatigue. They rely primarily on aerobic respiration, making them suited for endurance activities like marathon running.
参考答案： I型纤维（慢氧化）具有高肌红蛋白含量、密集的毛细血管网和大量线粒体。外观呈红色，收缩缓慢（慢速ATP酶亚型），抗疲劳性高。主要依赖有氧呼吸，适合马拉松等耐力活动。
Type IIb fibres (fast glycolytic) have low myoglobin content, fewer mitochondria, and extensive sarcoplasmic reticulum for rapid Ca²⁺ release. They are pale, generate high force rapidly (fast ATPase), but fatigue quickly due to high anaerobic enzyme activity. They predominate in sprinters.
IIb型纤维（快糖酵解）肌红蛋白含量低，线粒体较少，而肌浆网发达以快速释放Ca²⁺。外观苍白，能快速产生高力量（快速ATP酶），但因厌氧酶活性高而易疲劳。主要在短跑运动员中占优势。
Structurally, Type I fibres have smaller motor neurones and lower recruitment threshold, whereas Type IIb have larger neurones and higher threshold. The proportion of each fibre type is largely genetically determined, though training induces some metabolic shifts.
结构上，I型纤维的运动神经元较小、募集阈值较低，而IIb型纤维的神经元较大、阈值较高。各类纤维的比例主要由遗传决定，但训练可以引起一定的代谢转变。
Examiner’s Note: Use a comparative table mentally and always link structure to function and sport-specific examples.
考官点评： 在脑海中使用对比表格，始终将结构与功能以及运动专项实例联系起来。
4. Glycogenolysis and High-Intensity Exercise | 糖原分解与高强度运动
Question: Describe the process of glycogenolysis and its role during high-intensity exercise. (5 marks)
题目： 描述糖原分解过程及其在高强度运动中的作用。(5分)
Model Answer: Glycogenolysis is the breakdown of stored glycogen into glucose-1-phosphate, which is then converted to glucose-6-phosphate. This is catalysed by glycogen phosphorylase, an enzyme activated by adrenaline and increased calcium ions during muscle contraction.
参考答案： 糖原分解是将储存的糖原分解为1-磷酸葡萄糖，随后转化为6-磷酸葡萄糖的过程。该过程由糖原磷酸化酶催化，该酶在肌肉收缩时被肾上腺素和升高的钙离子激活。
During high-intensity exercise (e.g. repeated sprints or 400m running), the demand for ATP exceeds oxygen delivery. Muscle glycogen breaks down rapidly to provide glucose for anaerobic glycolysis, enabling fast ATP production and lactate formation. This allows the exercise to continue at a high intensity for up to 60-90 seconds.
在高强度运动（如反复冲刺或400米跑）中，ATP需求超过氧气供给。肌糖原迅速分解，为无氧糖酵解提供葡萄糖，从而实现快速ATP生成和乳酸的生成。这使得高强度运动可持续长达60-90秒。
Examiner’s Note: Emphasise the role of enzyme activation and the advantage of using stored muscle glycogen for immediate localised energy.
考官点评： 强调酶激活的作用，以及利用储存的肌糖原提供即时局部能量的优势。
5. Altitude Training and Endurance Performance | 高原训练与耐力表现
Question: Discuss how altitude training can enhance endurance performance. (10 marks)
题目： 讨论高原训练如何增强耐力表现。(10分)
Model Answer: Altitude training exposes athletes to a hypoxic environment, where the partial pressure of oxygen is lower. This stimulates the kidneys to release erythropoietin (EPO), which in turn increases red blood cell production and haemoglobin mass. After returning to sea level, the enhanced oxygen-carrying capacity can improve VO₂ max and endurance performance.
参考答案： 高原训练使运动员暴露于低氧环境，氧分压较低。这刺激肾脏释放促红细胞生成素(EPO)，进而增加红细胞生成和血红蛋白质量。回到平原后，提高的携氧能力可改善最大摄氧量和耐力表现。
Physiological adaptations include increased capillary density, greater mitochondrial content, and improved buffering capacity. However, ‘live high, train low’ strategies are often used because training intensity can be maintained at lower altitudes while still gaining haematological benefits.
生理适应包括增加毛细血管密度、线粒体含量和缓冲能力。然而，常采用“高住低练”策略，因为可以在低海拔保持训练强度，同时获得血液学益处。
Risks involve inadequate recovery, altitude sickness, and detraining if intensity drops too much. The optimal duration is 3-4 weeks at 2000-2500m, and responses vary individually.
风险包括恢复不足、高原病以及若强度下降过多则导致能力消退。最佳时长为海拔2000-2500米处3-4周，个体反应存在差异。
Examiner’s Note: For top marks, evaluate both physiological mechanisms and practical limitations, referencing the ‘live high, train low’ model.
考官点评： 要获得最高分，需同时评析生理机制和实际限制，提及“高住低练”模式。
6. Energy System Interplay in the 1500m Race | 1500米跑中的能量系统交互
Question: Analyse the contribution of the three energy systems during a 1500m race. (8 marks)
题目： 分析1500米比赛中三个能量系统的贡献。(8分)
Model Answer: A 1500m race lasts approximately 3.5-4 minutes, demanding a blend of energy systems. At the start and during the final kick, the ATP-PC system provides immediate power for acceleration. During the middle portion, the anaerobic glycolysis system supplies ATP at high rates, producing lactate as the intensity often exceeds the lactate threshold.
参考答案： 1500米跑持续约3分30秒至4分钟，需要能量系统的混合供应。起跑和最后冲刺时，ATP-PC系统为加速提供即时动力。中途，无氧糖酵解系统高速供应ATP，并产生乳酸，因为强度常超过乳酸阈。
Meanwhile, the aerobic system operates at near maximal capacity throughout the race, contributing the largest proportion of total ATP resynthesis (approx. 70-80%). This system uses oxygen to oxidise glycogen and fatty acids, enabling sustained pace. The interplay is seamless: all systems are active from the start, but their relative dominance shifts continuously.
同时，有氧系统整个比赛中近乎最大能力运作，贡献总ATP再合成约70-80%。该系统利用氧气氧化糖原和脂肪酸，维持配速。交互是无缝的：所有系统从一开始都活跃，但其相对优势不断转换。
Examiner’s Note: Provide percentage estimates and link system dominance to race phases. A graph description in words or mention of oxygen deficit at the start and EPOC post-race would enhance the answer.
考官点评： 提供百分比估计，并将系统主导性与比赛阶段关联。用文字描述图表或提及起跑时的氧亏和赛后EPOC会提升答案质量。
7. Evaluating Creatine Supplementation for a 400m Runner | 评估400米跑者的肌酸补充
Question: Evaluate the effectiveness of creatine supplementation for a 400m runner. (9 marks)
题目： 对400米跑者使用肌酸补充的有效性进行评价。(9分)
Model Answer: Creatine monohydrate supplementation increases intramuscular phosphocreatine stores, enhancing the capacity of the ATP-PC system. For a 400m runner (race time ~45-55 seconds), the event heavily relies on anaerobic glycolysis, but a powerful start and rapid acceleration benefit from improved ATP-PC turnover. This can delay fatigue onset during repeated high-intensity bursts in training.
参考答案： 一水肌酸补充可增加肌肉内磷酸肌酸储量，增强ATP-PC系统的能力。对于400米跑者（比赛时间约45-55秒），该项目高度依赖无氧糖酵解，但强劲的起跑和快速加速受益于ATP-PC周转的提高。这可以延缓训练中反复高强度爆发时的疲劳出现。
Effectiveness is more evident in repeated sprint efforts and training adaptations rather than single-race performance. Potential side effects include water retention, weight gain, and gastrointestinal discomfort. The loading phase (20g/day for 5 days) followed by maintenance (3-5g/day) is common.
其有效性更多体现在反复冲刺训练和训练适应中，而不是单次比赛表现。潜在副作用包括水潴留、体重增加和肠胃不适。常见方案为冲击期（每天20克，持续5天）后维持期（每天3-5克）。
However, for a 400m specialist, gains are marginal since the race’s primary ATP demand is met by glycolysis. Ethical and health considerations mean supplementation must be carefully managed. Overall, it may offer a small ergogenic advantage in training quality.
然而，对400米专项运动员而言，收益有限，因为比赛主要ATP需求由糖酵解满足。伦理和健康考量要求补充必须谨慎管理。总体而言，它可能在训练质量上提供小幅提升。
Examiner’s Note: A balanced evaluation with specific reference to the duration of the event and alternative ergogenic aids scores highly.
考官点评： 针对项目持续时间并兼顾其他补剂的平衡评价得分较高。
8. DOMS: Causes and Recovery Strategies | 延迟性肌肉酸痛：成因与恢复策略
Question: Explain the physiological causes of delayed onset muscle soreness (DOMS) and outline recovery methods. (6 marks)
题目： 解释延迟性肌肉酸痛(DOMS)的生理原因，并概述恢复方法。(6分)
Model Answer: DOMS typically peaks 24-72 hours after unaccustomed eccentric exercise. It is caused by microtrauma to the muscle fibres and connective tissues, which disrupts the sarcomere alignment and leads to an inflammatory response. This release of histamines and prostaglandins sensitises pain receptors, causing stiffness and tenderness.
参考答案： DOMS通常在不习惯的离心运动后24-72小时达到高峰。其原因是肌纤维和结缔组织的微损伤，破坏了肌节排列并引发炎症反应。释放的组胺和前列腺素使痛觉感受器敏感，导致僵硬和压痛。
Recovery methods include active recovery (low-intensity jogging), stretching, ice baths (cryotherapy), and sports massage. Nutritionally, protein intake and anti-inflammatory foods (omega-3) support repair. Proper warm-up and progressive overload training help prevent severe DOMS.
恢复方法包括主动恢复（低强度慢跑）、拉伸、冰浴（冷疗）和运动按摩。营养方面，摄入蛋白质和抗炎食物（欧米伽-3）有助于修复。充分热身和渐进超负荷训练有助于预防严重的DOMS。
Examiner’s Note: Linking the cause (eccentric component) to the recovery method shows applied understanding. Avoid vague statements like ‘rest is good’.
考官点评： 将原因（离心成分）与恢复方法联系起来，展现应用性理解。避免“休息就好”这样的笼统表述。
9. Designing a 6-Week Aerobic Training Programme | 设计6周有氧训练计划
Question: Design a 6-week training programme to improve a football player’s aerobic capacity. (10 marks)
题目： 设计一个为期6周的训练计划，以提高足球运动员的有氧能力。(10分)
Model Answer: The programme should follow the FITT principles (Frequency, Intensity, Time, Type) and periodisation. For a footballer, aerobic capacity is built through a combination of continuous training, fartlek, and interval sessions.
参考答案： 该计划应遵循FITT原则（频率、强度、时间、类型）和周期化。对于足球运动员，有氧能力通过结合持续性训练、法特莱克跑和间歇训练来建立。
| Week | Session Type | Intensity | Duration |
|---|---|---|---|
| 1-2 | Continuous run | 60-70% HR max | 30 min, 3x/week |
| 3-4 | Fartlek with ball | 70-80% HR max | 35 min, 3x/week |
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