📚 Year 9 Edexcel Physical Education: Core Knowledge Review | Year 9 Edexcel 体育：核心知识点梳理
In Year 9 Edexcel Physical Education, students build a strong foundation in key theoretical concepts that underpin sport and physical activity. This revision guide summarises the essential topics you need to know, from the components of fitness and training principles to body systems and skill development.
在 Year 9 Edexcel 体育课程中，学生将为运动与身体活动打下坚实的理论基础。本复习指南总结了核心知识点，包括健身组成、训练原则、身体系统以及技能发展，帮助你全面掌握考试要点。
1. Components of Fitness | 健身组成
Fitness is divided into health-related components and skill-related components. Health-related fitness includes cardiovascular endurance (ability of heart and lungs to supply oxygen), muscular strength (maximum force of a muscle), muscular endurance (ability to repeat contractions), flexibility (range of movement at a joint) and body composition (ratio of fat to lean mass).
健康相关的健身组成包括心血管耐力（心肺供氧能力）、肌肉力量（最大力量）、肌肉耐力（重复收缩能力）、柔韧性（关节活动范围）和身体成分（脂肪与瘦体重的比例）。
Skill-related fitness components are agility (changing direction quickly), balance (maintaining centre of mass), coordination (using senses and body parts together), power (strength x speed), reaction time (time to respond to stimulus) and speed (moving quickly). These are vital for performance in specific sports.
技能相关的健身组成有敏捷性（快速变向）、平衡（维持重心）、协调（感觉与身体协同）、爆发力（力量×速度）、反应时（对刺激的反应时间）和速度（快速移动）。这些对特定运动表现至关重要。
2. Principles of Training | 训练原则
Effective training follows the SPORT principles: Specificity (training relevant to the sport), Progression (gradually increasing demands), Overload (pushing beyond normal levels), Reversibility (fitness loss when you stop) and Tedium (avoiding boredom). Coaches apply FITT to achieve overload: Frequency, Intensity, Time and Type of exercise.
有效的训练遵循 SPORT 原则：针对性（与运动项目相关）、渐进性（逐步增加要求）、超负荷（超过正常水平）、可逆性（停止训练后体能下降）和趣味性（避免枯燥）。教练使用 FITT 原则来实现超负荷：频率、强度、时间和运动类型。
For example, to improve cardiovascular fitness, you might increase the Frequency from 3 to 4 sessions per week, raise Intensity to 70% of max heart rate, extend Time to 30 minutes, and alternate the Type between running and cycling.
例如，要提升心血管健康，你可以将频率从每周 3 次增加到 4 次，将强度提高到最大心率的 70%，将每次时间延长到 30 分钟，并在跑步和自行车之间交替运动类型。
3. Methods of Training | 训练方法
There are various training methods to target different fitness components. Continuous training involves steady exercise without rest, improving aerobic endurance. Fartlek training mixes paces (e.g., fast, slow) to replicate game situations. Interval training alternates bursts of high intensity with recovery periods, developing speed and anaerobic capacity.
针对不同健身要素有不同的训练方法。持续训练是不间断的稳定运动，可提升有氧耐力。法特莱克训练混合不同速度（如快、慢）以模拟比赛情境。间歇训练是将高强度爆发与恢复期交替，有助于发展速度和厌氧能力。
Circuit training uses a series of exercise stations to build strength and muscular endurance. Weight training uses free weights or machines to increase strength. Plyometric training involves explosive jumps to develop power. Flexibility training, such as static stretching, improves range of motion.
循环训练通过一系列练习站点来增强力量和肌肉耐力。重量训练使用杠铃哑铃或器械增加力量。增强式训练通过爆发性跳跃发展爆发力。柔韧性训练，如静态拉伸，可提高关节活动范围。
4. The Skeletal System | 骨骼系统
The skeleton has five key functions: support for the body, protection of vital organs (e.g., skull protects brain, ribcage protects heart/lungs), movement by providing attachment points for muscles, mineral storage (calcium and phosphorus), and blood cell production in bone marrow.
骨骼有五大功能：支撑身体，保护重要器官（如头颅保护大脑，胸廓保护心肺），通过为肌肉提供附着点协助运动，储存矿物质（钙和磷），以及在骨髓中生成血细胞。
Synovial joints, such as the knee, hip and shoulder, allow different types of movement. Ligaments connect bone to bone, tendons connect muscle to bone, and cartilage reduces friction. Types of freely movable joints include hinge (elbow, knee) and ball-and-socket (shoulder, hip).
滑膜关节，如膝、髋和肩，允许不同方向的运动。韧带连接骨与骨，肌腱连接肌肉与骨，软骨减少摩擦。自由活动关节的类型包括铰链关节（肘、膝）和球窝关节（肩、髋）。
5. The Muscular System | 肌肉系统
There are three types of muscle: skeletal (voluntary, attached to bones), smooth (involuntary, in walls of organs) and cardiac (heart muscle). In sport, we focus on skeletal muscles working in antagonistic pairs, such as the biceps and triceps at the elbow.
肌肉分为三种类型：骨骼肌（随意肌，附着于骨骼）、平滑肌（不随意肌，位于内脏器官壁）和心肌（心脏肌肉）。在运动中，我们主要关注成对拮抗工作的骨骼肌，如肘部的肱二头肌和肱三头肌。
Muscle fibres are classed as slow-twitch (Type I) -- suited to endurance activities because they work aerobically and resist fatigue -- and fast-twitch (Type IIx) -- designed for explosive, high-intensity movements but fatigue quickly. A mix of both is essential for all-round performance.
肌纤维分为慢肌纤维（I 型），适合耐力运动，通过有氧供能且抗疲劳；以及快肌纤维（IIx 型），适合爆发性高强度运动但易疲劳。两者兼具对全面表现至关重要。
6. The Cardiovascular System | 心血管系统
The double circulatory system sends blood through the heart twice: pulmonary circulation (heart to lungs and back) and systemic circulation (heart to body and back). The heart has four chambers: right atrium, right ventricle, left atrium and left ventricle. Blood vessels include arteries (carry blood away), veins (carry blood back) and capillaries (site of exchange).
双循环系统使血液两次流经心脏：肺循环（心脏→肺→心脏）和体循环（心脏→全身→心脏）。心脏有四个腔室：右心房、右心室、左心房和左心室。血管包括动脉（运血出心）、静脉（回血入心）和毛细血管（物质交换处）。
During exercise, HR and SV increase, raising Q to deliver more oxygen to working muscles. Blood contains red blood cells (carry oxygen), white blood cells (fight infection), platelets (clotting) and plasma.
心输出量（Q）是每分钟泵出的血量，计算公式为心率（HR）× 每搏输出量（SV）。运动时，心率和每搏输出量均增加，从而提升心输出量，为工作肌肉输送更多氧气。血液包含红细胞（携带氧气）、白细胞（抗感染）、血小板（凝血）和血浆。
7. The Respiratory System | 呼吸系统
Air enters through the nose/mouth, passes the pharynx, larynx, trachea, bronchi, bronchioles and finally reaches the alveoli. Alveoli are tiny air sacs surrounded by capillaries where gaseous exchange occurs: oxygen diffuses into the blood, and carbon dioxide diffuses out.
空气经鼻或口进入，通过咽、喉、气管、支气管、细支气管，最终到达肺泡。肺泡是微小的气囊，被毛细血管包围，在此进行气体交换：氧气扩散入血，二氧化碳扩散排出。
During exercise, tidal volume (depth of breathing) and breathing rate increase, boosting minute ventilation to meet oxygen demand. Vital capacity is the maximum volume you can exhale after a maximum inhalation. Regular aerobic training improves respiratory efficiency.
运动时，潮气量（呼吸深度）和呼吸频率增加，从而提升每分通气量以满足氧气需求。肺活量是最大吸气后能呼出的最大气量。规律的有氧训练能提升呼吸系统效率。
8. Energy Systems | 能量系统
Muscles resynthesise ATP (adenosine triphosphate) to fuel contraction. There are three main energy systems: the ATP-PC system (phosphocreatine) provides immediate energy for up to 10 seconds of maximal effort (e.g., 100 m sprint). Anaerobic glycolysis (lactic acid system) supplies energy for high-intensity activity lasting up to 90 seconds, producing lactic acid as a by-product. The aerobic system uses oxygen to break down carbohydrates and fats, dominating during long-duration, low- to moderate-intensity exercise.
肌肉通过再合成 ATP（三磷酸腺苷）为收缩供能。三大能量系统为：ATP-PC 系统（磷酸肌酸）提供最长 10 秒的极限运动即时能量（如 100 米冲刺）。无氧糖酵解（乳酸系统）为持续 90 秒以内的高强度活动供能，并产生乳酸副产物。有氧系统利用氧气分解碳水化合物和脂肪，在长时间、中低强度运动中占主导。
Understanding these systems helps athletes design training to target specific energy pathways -- for instance, repeated sprints develop the lactic acid system, while steady-state jogging builds the aerobic base.
了解这些系统能帮助运动员设计针对特定能量通路的训练——例如，反复冲刺可发展乳酸系统，而稳态慢跑能建立有氧基础。
9. Health, Fitness and Well-being | 健康、体能与幸福
Health is a state of complete physical, mental and social well-being, not merely the absence of disease. Regular physical activity helps to manage weight, strengthen the immune system, reduce stress and improve self-esteem. It also promotes better sleep and social interaction through team sports.
健康是身体、心理和社会适应方面均处于完好状态，而不仅仅是没有疾病。规律的体育活动有助于控制体重、增强免疫系统、减压和提升自尊心。它还能通过团队运动改善睡眠和社交互动。
Fitness is the ability to meet the demands of the environment. A fit individual can perform everyday tasks without undue fatigue. For Year 9 students, developing a positive relationship with exercise is key to long-term health benefits.
体能是指满足环境需求的能力。一个体能好的人可以在不过度疲劳的情况下完成日常任务。对 Year 9 学生而言，与运动建立积极关系是获得长期健康效益的关键。
10. Diet, Nutrition and Hydration | 饮食、营养与补水
A balanced diet provides the energy and nutrients needed for growth, repair and performance. Macronutrients include carbohydrates (main energy source, stored as glycogen), fats (slow-release energy, insulation) and proteins (muscle repair and growth). Micronutrients (vitamins and minerals) support immune function, bone health and energy release.
均衡饮食提供生长、修复和运动表现所需的能量和营养素。宏量营养素包括碳水化合物（主要能量来源，以糖原形式储存）、脂肪（缓慢释放能量、保温）和蛋白质（肌肉修复与生长）。微量营养素（维生素和矿物质）支持免疫功能、骨骼健康和能量释放。
Hydration is critical; even slight dehydration can impair concentration and physical performance. Before, during and after exercise, it is important to drink water. For endurance events, isotonic drinks replace fluids and electrolytes. A pre-exercise meal should be high in carbohydrates and low in fat and fibre to aid digestion.
补水极为重要；即使轻度脱水也会损害注意力和身体表现。运动前、中、后都应饮水。耐力项目可选择等渗饮料补充液体和电解质。运动前餐食应高碳水、低脂肪和低纤维，以利于消化。
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