📚 IGCSE Cambridge Physical Education: Core Knowledge Summary | IGCSE Cambridge 体育：核心知识点梳理
This guide provides a structured summary of the core knowledge required for the Cambridge IGCSE Physical Education syllabus. It covers key anatomy and physiology, training principles, skill-related concepts, nutrition, injury prevention, and lifestyle factors, helping students revise efficiently and apply theory to practical sporting examples.
本文为 Cambridge IGCSE 体育课程提供系统核心知识梳理，涵盖解剖与生理、训练原则、技能相关概念、营养、伤病预防及生活方式因素，帮助考生高效复习并将理论联系实际运动案例。
1. The Skeletal System | 骨骼系统
The skeleton has four main functions: support, protection, movement, and blood cell production. Bones such as the femur, tibia, radius, and ulna provide attachment sites for skeletal muscles, while the cranium protects the brain and the rib cage protects the heart and lungs.
骨骼有四大功能：支撑、保护、运动与造血。股骨、胫骨、桡骨和尺骨等骨骼为骨骼肌提供附着点，颅骨保护大脑，肋骨保护心脏和肺。
Bones are connected by ligaments and store minerals such as calcium and phosphorus. In a long bone, the diaphysis is the shaft, the epiphysis is the end, and articular cartilage reduces friction at joint surfaces.
骨骼通过韧带相连，并储存钙、磷等矿物质。长骨中，骨干为骨体，骨骺为骨端，关节软骨可减少关节面摩擦。
2. Joints and Movement | 关节与运动
A joint is where two or more bones meet. Synovial joints such as the ball-and-socket shoulder and hinge knee allow movement. The joint capsule contains synovial fluid, which lubricates the joint and nourishes cartilage.
关节是两块或多块骨骼的连接处。球窝关节（如肩关节）和屈戌关节（如膝关节）等滑膜关节可产生运动。关节囊内含有滑液，可润滑关节并滋养软骨。
Movement terms include flexion (decreasing the angle at a joint), extension (increasing the angle), abduction (moving a limb away from the midline), adduction (moving toward the midline), and rotation. Levers in the body use bones as rigid bars, joints as fulcrums, muscles as effort, and the body part or object as resistance.
运动术语包括屈曲（减小关节角度）、伸展（增大关节角度）、外展（肢体远离身体中线）、内收（肢体靠近身体中线）和旋转。人体杠杆以骨为刚性杆、关节为支点、肌肉为动力、身体部位或物体为阻力。
3. The Muscular System | 肌肉系统
Skeletal muscle works by contracting to pull on bones. Antagonistic pairs produce coordinated movement: for example, the biceps is the agonist during elbow flexion, while the triceps is the antagonist; during extension these roles reverse.
骨骼肌通过收缩牵拉骨骼。拮抗肌对产生协调运动：例如，肘屈时肱二头肌为主动肌，肱三头肌为拮抗肌；肘伸时两者角色互换。
Muscle fibre types influence performance. Type I (slow twitch) fibres are fatigue-resistant and suit endurance events. Type IIa (fast oxidative) fibres support repeated high-speed work, while Type IIx (fast glycolytic) fibres generate explosive force but fatigue quickly.
肌纤维类型影响运动表现。I 型（慢缩）纤维抗疲劳，适合耐力项目。IIa 型（快氧化）纤维支持重复性高速运动，而 IIx 型（快糖酵解）纤维产生爆发力但很快疲劳。
4. The Respiratory System | 呼吸系统
Air enters through the nose or mouth, passes the pharynx, larynx, and trachea, then travels through bronchi and bronchioles to the alveoli. Gaseous exchange occurs at the alveoli: oxygen diffuses into the blood and carbon dioxide diffuses out.
空气从鼻或口进入，经咽、喉、气管，再通过支气管和细支气管到达肺泡。气体交换在肺泡进行：氧扩散进入血液，二氧化碳扩散排出。
Key lung volumes include tidal volume (air per normal breath), vital capacity (maximum air exhaled after maximum inhalation), and minute ventilation (tidal volume x breathing rate). During exercise, both breathing rate and tidal volume increase to deliver more oxygen.
关键肺容量包括潮气量（每次正常呼吸的空气量）、肺活量（最大吸气后最大呼气的空气量）和每分通气量（潮气量 × 呼吸频率）。运动时，呼吸频率和潮气量均增加以输送更多氧气。
Minute Ventilation = Tidal Volume × Breathing Rate | 每分通气量 = 潮气量 × 呼吸频率
5. The Circulatory System | 循环系统
The heart has four chambers: right atrium, right ventricle, left atrium, and left ventricle. The right side pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the body.
心脏有四个腔室：右心房、右心室、左心房和左心室。右心将缺氧血泵入肺，左心将富氧血泵至全身。
Blood vessels include arteries (thick, elastic walls carry blood away from the heart), veins (thinner walls with valves to prevent backflow), and capillaries (one-cell-thick walls for exchange). Cardiac output is stroke volume x heart rate.
血管包括动脉（壁厚且有弹性，将血液运离心脏）、静脉（壁较薄并有瓣膜防止回流）和毛细血管（壁仅一个细胞厚，便于物质交换）。心输出量 = 每搏输出量 × 心率。
Cardiac Output = Stroke Volume × Heart Rate | 心输出量 = 每搏输出量 × 心率
6. Energy Systems | 能量系统
ATP is the immediate energy source for muscle contraction. The phosphocreatine (ATP-PC) system supplies energy for high-intensity activities lasting up to about 10 seconds, such as a 100 m sprint or a jump shot.
ATP 是肌肉收缩的直接能量来源。磷酸肌酸（ATP-PC）系统为约 10 秒内的高强度活动供能，如 100 米冲刺或跳投。
The anaerobic glycolytic system uses glucose without oxygen and dominates efforts from around 10 to 90 seconds, producing lactic acid. The aerobic system uses oxygen to break down carbohydrates and fats for endurance events lasting longer than two to three minutes.
无氧糖酵解系统在无氧条件下利用葡萄糖，主导约 10 至 90 秒的运动，并产生乳酸。有氧系统利用氧气分解碳水化合物和脂肪，为持续超过 2-3 分钟的耐力项目供能。
After intense anaerobic work, an oxygen debt builds up. Excess post-exercise oxygen consumption (EPOC) restores ATP/PC stores, removes lactate, and returns heart rate and breathing to resting levels.
剧烈无氧运动后会产生氧债。运动后过量氧耗（EPOC）可恢复 ATP/PC 储备、清除乳酸，并让心率和呼吸恢复到安静水平。
7. Components of Fitness | 体能要素
Health-related components include cardiovascular endurance, muscular strength, muscular endurance, flexibility, and body composition. Skill-related components include agility, balance, coordination, power, reaction time, and speed.
健康相关体能包括心血管耐力、肌肉力量、肌肉耐力、柔韧性和身体成分。技能相关体能包括敏捷性、平衡、协调、爆发力、反应时间和速度。
Different sports demand different blends. A marathon runner needs high cardiovascular endurance, while a gymnast relies heavily on flexibility, balance, and coordination. Fitness testing can include the multi-stage fitness test, hand grip dynamometer, sit-and-reach test, and 30 m sprint.
不同运动要求不同的体能组合。马拉松跑者需要很高的心血管耐力，而体操运动员则高度依赖柔韧性、平衡和协调。体能测试可包括多阶段体能测试、握力计、坐位体前屈和 30 米冲刺。
8. Principles of Training | 训练原则
Effective training follows the SPORT and FITT principles. Specificity means training must match the activity, Progression means gradually increasing demand, Overload means working harder than normal, Reversibility means fitness is lost when training stops, and Tedium means variety is needed.
有效训练遵循 SPORT 和 FITT 原则。专项性指训练必须与目标活动一致；渐进性指逐渐增加负荷；超负荷指训练强度需高于平时水平；可逆性指停止训练后体能会下降；多样性指训练需要变化以避免枯燥。
FITT stands for Frequency, Intensity, Time, and Type. Intensity can be monitored using heart rate. A common estimate for maximum heart rate is:
FITT 分别代表频率、强度、时间和类型。强度可用心率监控。常用的最大心率估算公式为：
Max Heart Rate = 220 – Age | 最大心率 = 220 – 年龄
A target zone for aerobic training is often 60-80% of maximum heart rate. For high-intensity interval training, work periods may reach 85-95% of maximum heart rate.
有氧训练的靶心率通常为最大心率的 60%-80%。在高强度间歇训练中，运动阶段心率可达到最大心率的 85%-95%。
9. Skill Classification and Feedback | 技能分类与反馈
Skills can be placed on continua: open to closed, gross to fine, discrete to continuous, and externally paced to self-paced. An open skill such as a football pass is affected by changing opponents, while a closed skill such as a free throw is performed in a stable environment.
技能可按连续体分类：开放至封闭、粗大至精细、分立至连续、外部节奏至自我节奏。开放技能如足球传球会受到不断变化的对手影响，而封闭技能如罚球则在稳定环境中完成。
Feedback improves learning and performance. Intrinsic feedback comes from the performer’s senses, extrinsic feedback comes from a coach or video, knowledge of results tells the outcome, and knowledge of performance describes how the movement was executed.
反馈有助于学习和表现。内在反馈来自运动员自身的感觉，外在反馈来自教练或视频，结果反馈告知动作结果，表现反馈则描述动作完成的过程。
10. Nutrition and Hydration | 营养与水分
Macronutrients include carbohydrates (main energy source), proteins (growth and repair), and fats (slow energy and insulation). Micronutrients such as vitamins and minerals support bone health, immune function, and energy release.
宏量营养素包括碳水化合物（主要能量来源）、蛋白质（生长与修复）和脂肪（缓慢供能与保温）。微量营养素如维生素和矿物质支持骨骼健康、免疫功能与能量释放。
Carbohydrate loading can benefit endurance performance, while post-exercise protein helps muscle repair. Dehydration of even 2% of body mass can reduce performance, so water intake before, during, and after exercise is essential.
碳水化合物负荷可提高耐力表现，运动后补充蛋白质有助于肌肉修复。即使仅失水达体重的 2% 也会降低运动表现，因此运动前、中、后补水至关重要。
11. Injury Prevention and Recovery | 伤病预防与恢复
Injury prevention includes a warm-up to raise heart rate and stretch muscles, a cool-down to gradually lower intensity, appropriate equipment, and correct technique. Common soft tissue injuries include sprains (ligaments), strains (muscles or tendons), and bruises.
预防伤病包括通过热身提高心率并拉伸肌肉、通过整理活动逐渐降低运动强度、使用适当装备和采用正确技术。常见软组织损伤包括扭伤（韧带）、拉伤（肌肉或肌腱）和挫伤。
Immediate treatment often follows RICER: Rest, Ice, Compression, Elevation, and Referral. Recovery methods include active recovery, massage, contrast baths, and adequate sleep.
急性损伤处理通常遵循 RICER 原则：休息、冰敷、加压、抬高和转诊。恢复方法包括主动恢复、按摩、冷热水交替浴和充足的睡眠。
12. Health, Fitness and Well-being | 健康、体能与幸福
Health is a state of complete physical, mental, and social well-being, while fitness is the ability to meet the demands of the environment. Physical activity reduces risks of obesity, cardiovascular disease, type 2 diabetes, and improves mental health by reducing stress and anxiety.
健康是指身体、心理和社会适应的完好状态，而体能是满足环境需求的能力。规律身体活动可降低肥胖、心血管疾病和 2 型糖尿病的风险，并通过减少压力和焦虑改善心理健康。
Lifestyle factors such as diet, sleep, smoking, and alcohol use influence both health and sporting performance. Schools and sports clubs promote exercise through accessible facilities, positive role models, and social opportunities.
饮食、睡眠、吸烟和饮酒等生活方式因素会影响健康和运动表现。学校和体育俱乐部通过便捷的设施、积极的榜样和社交机会促进锻炼。
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