📚 Year 12 WJEC Physical Education: Core Knowledge Review | Year 12 WJEC 体育：核心知识点梳理
Welcome to your comprehensive revision guide for Year 12 WJEC Physical Education. This article brings together the core topics you need to master—from how the body responds to exercise, to the psychology behind performance and the sociocultural factors that shape sport. Each section is designed to reinforce key definitions, mechanisms and applied examples, helping you build confidence for your assessments.
欢迎阅读 Year 12 WJEC 体育核心知识点梳理。本文汇集了需要掌握的核心主题——从身体对运动的反应，到表现背后的心理学，再到塑造体育的社会文化因素。每个部分都旨在强化关键定义、机制和应用实例，帮助你建立考试信心。
1. Cardiovascular System | 心血管系统
The cardiovascular system is central to exercise performance. Heart rate (HR) is the number of times the heart beats per minute. Stroke volume (SV) is the volume of blood pumped out by the left ventricle per beat. Cardiac output (Q) is the product of HR and SV.
心血管系统对运动表现至关重要。心率（HR）是心脏每分钟跳动的次数。每搏输出量（SV）是左心室每次搏动泵出的血液量。心输出量（Q）是心率与每搏输出量的乘积。
Q = HR x SV
心输出量 = 心率 x 每搏输出量
During exercise, HR increases linearly with intensity, whilst SV rises initially but plateaus at around 40-60% of maximal effort. The increase in venous return via the muscle pump and respiratory pump stretches the ventricular walls, leading to a more forceful contraction (Starling’s law).
运动时，心率随强度线性增加，而每搏输出量起初上升，但在最大努力的40-60%左右达到平台期。通过肌肉泵和呼吸泵增加的静脉回流量拉伸心室壁，导致更有力的收缩（施塔林定律）。
Long-term adaptations include cardiac hypertrophy (enlarged left ventricle), increased SV at rest and during exercise, lower resting HR (bradycardia) and improved cardiac output. These changes enhance oxygen delivery and endurance capacity.
长期适应包括心脏肥大（左心室增大）、静息和运动时每搏输出量增加、静息心率降低（心动过缓）以及心输出量改善。这些变化增强了氧气输送和耐力能力。
2. Respiratory System | 呼吸系统
The respiratory system provides oxygen for aerobic energy production and removes carbon dioxide. Key structures are the nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles and alveoli, where gaseous exchange occurs.
呼吸系统为有氧供能提供氧气并清除二氧化碳。关键结构包括鼻腔、咽、喉、气管、支气管、细支气管以及进行气体交换的肺泡。
Minute ventilation (VE) is the volume of air moved in and out of the lungs per minute, calculated as tidal volume (TV) multiplied by breathing frequency (f). During exercise, both TV and f rise, causing a sharp increase in VE.
每分通气量（VE）是每分钟进出肺部的空气量，由潮气量（TV）乘以呼吸频率（f）计算得出。运动时，潮气量和呼吸频率均上升，导致每分通气量急剧增加。
External respiration refers to the diffusion of O₂ from alveoli into the blood and CO₂ from the blood into alveoli, driven by partial pressure gradients. Internal respiration occurs at the tissues, where O₂ is unloaded and CO₂ is taken up.
外呼吸指氧气从肺泡扩散到血液、二氧化碳从血液扩散到肺泡，由分压梯度驱动。内呼吸发生在组织层面，氧气被卸载，二氧化碳被摄取。
Oxygen is transported mainly bound to haemoglobin (98%), while carbon dioxide is carried as bicarbonate ions (70%), dissolved in plasma (7%) and bound to haemoglobin (23%). The Bohr shift describes how increased CO₂ and acidity reduce haemoglobin’s affinity for O₂, aiding release at active muscles.
氧气主要通过血红蛋白运输（98%），二氧化碳则以碳酸氢根离子（70%）、溶解于血浆（7%）以及与血红蛋白结合（23%）的形式携带。玻尔效应描述了增加的二氧化碳和酸度如何降低血红蛋白对氧气的亲和力，有助于活跃肌肉处氧气的释放。
3. Neuromuscular System | 神经肌肉系统
Muscle contraction begins with a nerve impulse arriving at the neuromuscular junction. Acetylcholine is released, depolarising the sarcolemma and triggering calcium release from the sarcoplasmic reticulum. This exposes binding sites on actin filaments.
肌肉收缩始于神经冲动抵达神经肌肉接头。乙酰胆碱被释放，使肌膜去极化，并触发肌浆网释放钙离子。这暴露了肌动蛋白丝上的结合位点。
The sliding filament theory explains how myosin heads pull actin filaments towards the centre of the sarcomere, shortening the muscle fibre. This process requires ATP for cross-bridge cycling and for detaching myosin heads.
肌丝滑动学说解释了肌球蛋白头如何将肌动蛋白丝拉向肌节中心，缩短肌纤维。此过程需要ATP用于横桥循环以及肌球蛋白头的脱离。
Motor units consist of a motor neurone and all the muscle fibres it innervates. Type I (slow-twitch) fibres are suited to endurance due to high mitochondrial and capillary density. Type IIa (fast oxidative) and Type IIx (fast glycolytic) fibres are recruited for higher force and speed demands.
运动单位由一个运动神经元及其支配的所有肌纤维组成。I型（慢缩）纤维因线粒体和毛细血管密度高而适合耐力运动。IIa型（快缩氧化）和IIx型（快缩糖酵解）纤维在需要更大力量和速度时被募集。
Proprioceptors such as muscle spindles detect stretch and initiate the stretch reflex, while Golgi tendon organs sense tension and can inhibit muscle contraction to prevent damage. These mechanisms are crucial for coordinated movement and injury prevention.
本体感受器如肌梭能检测牵张并引发牵张反射，而高尔基腱器感知张力，能抑制肌肉收缩以防止损伤。这些机制对协调运动和预防损伤至关重要。
4. Energy Systems | 能量系统
All movement is powered by adenosine triphosphate (ATP). The body resynthesizes ATP through three systems. The ATP-PCr system (phosphocreatine) provides immediate energy for up to 10 seconds of maximal effort without oxygen, using the enzyme creatine kinase.
所有运动由三磷酸腺苷（ATP）供能。身体通过三个系统重新合成ATP。ATP-PCr系统（磷酸肌酸）在无氧条件下为最多10秒的最大努力提供即时能量，使用肌酸激酶。
The glycolytic system produces ATP anaerobically by breaking down glucose, yielding 2 ATP per glucose molecule. It supports high-intensity exercise lasting 30–90 seconds. A by-product is lactate, associated with muscular fatigue.
糖酵解系统在无氧条件下分解葡萄糖产生ATP，每分子葡萄糖净产2个ATP。它支持持续30-90秒的高强度运动。副产品乳酸与肌肉疲劳相关。
The aerobic system takes place in the mitochondria and produces large amounts of ATP (approximately 38 per glucose) using oxygen. It involves the Krebs cycle and the electron transport chain, and can also metabolise fats and, in extreme conditions, protein.
有氧系统在线粒体中发生，利用氧气产生大量ATP（每分子葡萄糖约38个）。它涉及克雷布斯循环和电子传递链，也能代谢脂肪，在极端条件下代谢蛋白质。
Energy system interplay means all three systems contribute simultaneously, but one dominates depending on intensity and duration. Training can improve the efficiency of these systems, such as increasing phosphocreatine stores or mitochondrial density.
能量系统的相互作用意味着三个系统同时供能，但根据强度和持续时间，其中一个占主导。训练可以提高这些系统的效率，如增加磷酸肌酸储备或线粒体密度。
5. Principles of Training | 训练原则
Training must follow core principles to be effective. Specificity states that adaptations are specific to the muscles, movements and energy systems used. Progressive overload requires gradually increasing the training stimulus—through frequency, intensity, time or type (FITT)—to continue making gains.
有效的训练必须遵循核心原则。特异性原则指出，适应是针对所使用肌肉、动作和能量系统的。渐进超负荷要求通过频率、强度、时间或类型（FITT）逐步增加训练刺激，以持续取得进步。
Overload can be manipulated using the FITT formula: Frequency (how often), Intensity (how hard), Time (duration) and Type (exercise mode). Reversibility warns that gains are lost when training stops, and the principle of rest and recovery highlights the need for adaptation periods to avoid overtraining.
可使用FITT公式操纵超负荷：频率（多久一次）、强度（多困难）、时间（持续时间）和类型（运动形式）。可逆性原则警告，停止训练后收益会丧失；休息与恢复原则强调需要适应期以避免过度训练。
Periodisation structures training into macrocycles, mesocycles and microcycles to peak at the right time. Tapering reduces volume before competition to optimise performance. Testing and evaluation measure baseline levels and track progress via components such as the 30-metre sprint (speed) or the multi-stage fitness test (aerobic power).
周期化将训练分为大周期、中周期和小周期，以便在正确时间达到巅峰。赛前减量训练通过减少训练量来优化表现。测试与评估通过30米冲刺（速度）或多阶段体能测试（有氧能力）等测量基线水平并跟踪进展。
6. Skill Acquisition | 技能习得
A skill is a learned action with a predetermined result, performed with maximum certainty and minimum outlay of energy. Skills can be classified along continua: open-closed (affected by environment), gross-fine (muscle groups), and discrete-serial-continuous (clear start and end).
技能是一种经过学习的动作，具有预定的结果，以最大确定性和最小能量消耗完成。技能可沿连续体分类：开放-闭合（受环境影响）、粗大-精细（肌肉群）以及分立-序列-连续（清晰的开始和结束）。
Fitts and Posner’s stages of learning are cognitive (understanding and errors), associative (refining technique, fewer mistakes) and autonomous (automatic execution, low attention demand). Feedback—intrinsic and extrinsic, knowledge of results and knowledge of performance—guides the learner through these stages.
菲兹和波斯纳的学习阶段包括认知阶段（理解与错误）、联结阶段（精炼技术、错误减少）和自主阶段（自动化执行、注意力需求低）。反馈——内在的和外在的、结果知晓和表现知晓——引导学习者通过这些阶段。
Types of practice include massed (continuous, no rest) and distributed (rest intervals) for simple to complex tasks; variable practice promotes schema development. Mental rehearsal involves imagining performance and can enhance learning by strengthening neural pathways.
练习类型包括集中练习（连续、无休息）和分散练习（有休息间隔），适用于简单到复杂的任务；变换练习促进图式发展。心理演练涉及想象运动表现，可通过强化神经通路增强学习。
Transfer of learning may be positive (one skill helps another), negative (one skill hinders another), proactive (past skill affects new one) or bilateral (transfer between limbs). Coaches design drills that encourage positive transfer for faster improvement.
学习迁移可以是正迁移（一项技能有助于另一项）、负迁移（一项技能阻碍另一项）、前摄迁移（旧技能影响新技能）或双侧迁移（肢体间转移）。教练设计能促进正迁移的训练，以加快进步。
7. Sport Psychology | 运动心理学
Personality traits can influence sporting performance. Type A individuals are competitive, highly strung and may perform well under pressure, while Type B personalities are relaxed and less prone to anxiety. Trait and state anxiety are key concepts: trait anxiety is a general disposition, while state anxiety is situational.
人格特质会影响运动表现。A型人格具有竞争性、易紧张，可能在压力下表现出色；B型人格则放松，不易焦虑。特质焦虑和状态焦虑是关键概念：特质焦虑是普遍倾向，状态焦虑则与情境相关。
Arousal refers to the physiological and psychological readiness for performance. The inverted-U hypothesis suggests that performance peaks at a moderate level of arousal, whereas the catastrophe theory proposes a sudden drop in performance if arousal becomes too high combined with cognitive anxiety.
唤醒是指生理和心理上的准备状态。倒U型假说认为，表现在中等唤醒水平时达到峰值；而灾难理论提出，如果唤醒过高并伴随认知焦虑，表现会突然下降。
Goal setting using the SMARTER principle (Specific, Measurable, Achievable, Recorded, Time-bound, Evaluated, Reviewed) helps athletes direct effort and monitor progress. Confidence, often enhanced through vicarious experience, verbal persuasion and successful performance, is central to achievement.
采用SMARTER原则（具体的、可测量的、可实现的、有记录的、有时限的、可评估的、可复查的）的目标设定帮助运动员引导努力并监控进展。自信心常通过替代经验、言语说服和成功表现来增强，对成就至关重要。
8. Sociocultural Influences | 社会文化影响
Participation in sport is shaped by a range of sociocultural factors. Social class can limit access due to cost, while gender stereotypes historically excluded women from certain sports. Ethnicity and cultural norms also affect sport choices and opportunities.
体育参与受多种社会文化因素影响。社会阶层可能因费用限制参与机会，而性别刻板印象在历史上将女性排除在某些运动之外。种族和文化规范也影响运动选择和机会。
The participation pyramid moves from foundation (school PE, beginner level) through participation (recreational sport), performance (club, county) and elite (international competition). Media coverage and commercialisation have increased funding but can also pressure athletes and distort sport values.
参与金字塔从基础层（学校体育、初学者水平）经过参与层（娱乐性运动）、表现层（俱乐部、郡级）到精英层（国际比赛）。媒体报道和商业化增加了资金，但也可能对运动员施加压力并扭曲体育价值观。
The Olympic ideals of fair play, education and international understanding contrast with contemporary issues such as deviance (doping, match-fixing) and the globalisation of sport, which blends cultures but can threaten traditional games. National governing bodies and policies aim to promote equality and safeguard integrity.
奥运理想强调公平竞争、教育和国际理解，与当今的越轨行为（兴奋剂、操纵比赛）和体育全球化形成对比，后者融合文化但可能威胁传统体育。国家管理机构与政策致力于促进平等并维护诚信。
9. Biomechanics and Movement Analysis | 生物力学与动作分析
Biomechanics applies the laws of mechanics to human movement. Newton’s First Law (inertia) states that a body remains at rest or in uniform motion unless acted upon by an external force. Second Law relates force, mass and acceleration (F = m x a). Third Law states that for every action there is an equal and opposite reaction.
生物力学将力学定律应用于人体运动。牛顿第一定律（惯性）指出，物体保持静止或匀速运动除非受外力作用。第二定律将力、质量和加速度联系起来（F = m × a）。第三定律说明每个作用力都有一个大小相等、方向相反的反作用力。
Centre of mass is the point where the body’s mass is concentrated. Stability can be increased by widening the base of support, lowering the centre of mass and keeping the line of gravity within the base. Levers (first, second and third class) explain how bones and muscles produce movement; most human levers are third class for speed and range.
质心是身体质量集中的点。通过加宽支撑面、降低质心并将重力线保持在支撑面内可以提高稳定性。杠杆（一、二、三类）解释了骨骼和肌肉如何产生运动；人体大多数杠杆是第三类，为了速度和活动范围。
Projectile motion is influenced by angle of release, height of release and velocity of release; the optimal angle is 45° when release and landing heights are equal. Analysing movement through video and technology helps identify strengths and weaknesses, enabling targeted interventions.
抛体运动受投掷角度、出手高度和出手速度的影响；当出手高度与落地高度相同时，最适角度为45°。通过视频和技术分析动作有助于识别优缺点，实现针对性干预。
10. Nutrition and Hydration | 营养与补水
A balanced diet provides the energy and nutrients needed for training and recovery. Carbohydrates are the main fuel for high-intensity work and should be stored as glycogen. Fats supply energy for prolonged, low-intensity activity. Proteins are essential for growth and repair of tissues.
均衡饮食提供训练和恢复所需的能量与营养。碳水化合物是高强度运动的主要燃料，应以糖原形式储存。脂肪为长时间低强度活动提供能量。蛋白质对组织生长和修复至关重要。
Vitamins and minerals support numerous bodily functions: iron aids oxygen transport, calcium strengthens bones, and B vitamins assist energy metabolism. Fibre aids digestion, while adequate hydration maintains blood volume, temperature regulation and cognitive function.
维生素和矿物质支持多种身体功能：铁协助氧气运输，钙强化骨骼，B族维生素辅助能量代谢。纤维帮助消化，而充足补水维持血容量、体温调节和认知功能。
Pre-exercise meals should be high in carbohydrates, moderate in protein and low in fat to maximise glycogen stores. During exercise lasting over 60 minutes, ingesting 30-60 g of carbohydrate per hour can delay fatigue. Post-exercise, the ‘window of opportunity’ promotes glycogen resynthesis when carbs and protein are consumed within 30-60 minutes.
运动前餐食应高碳水化合物、适量蛋白质和低脂肪，以最大化糖原储备。持续超过60分钟的运动中，每小时摄入30-60克碳水化合物可延缓疲劳。运动后，’机会窗口’ 指在30-60分钟内摄入碳水化合物和蛋白质可促进糖原再合成。
Dehydration, even at 2% body mass loss, impairs performance. Electrolyte balance, particularly sodium, is vital for nerve impulses and muscle contractions. Practical hydration strategies include drinking 5-7 ml/kg body mass 2-3 hours before and using sports drinks during prolonged exercise.
脱水即使仅损失2%体重也会损害表现。电解质平衡，尤其是钠，对神经冲动和肌肉收缩至关重要。实用的补水策略包括运动前2-3小时饮用5-7毫升/千克体重的水，以及在长时间运动中饮用运动饮料。
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