📚 Year 8 CIE Physical Education: Core Knowledge Review | Year 8 CIE 体育：核心知识点梳理
Physical Education in Year 8 under the CIE framework builds a strong foundation by linking theory with practical movement. This article provides a clear and bilingual summary of the key topics you must understand, from health and fitness to body systems, training principles, nutrition and safety. Each section is designed to help you revise efficiently and deepen your understanding in both English and Chinese.
八年级 CIE 体育课程将理论与运动实践紧密结合，为后续学习打下坚实基础。本文以中英双语清晰梳理了从健康体能到身体系统、训练原则、营养与安全等核心知识点，帮助你高效复习、深化理解。
1. Health and Fitness | 健康与体能
Health is a state of complete physical, mental and social well-being, not merely the absence of disease.
健康是一种完整的身体、心理和社会福祉状态，而不仅仅是没有疾病。
Fitness is the ability to meet the demands of the environment and carry out daily tasks without undue fatigue.
体能是满足环境需求、无过度疲劳地完成日常任务的能力。
A person can be healthy without being physically fit for a specific sport, but regular exercise improves both health and fitness.
一个人可以身体健康但不一定具备某项运动的专项体能，而规律锻炼能同时提升健康与体能水平。
2. Components of Fitness | 体能组成部分
Fitness components are divided into health-related and skill-related factors. Health-related components are essential for overall well-being, while skill-related components enhance performance in specific activities.
体能组成部分分为健康相关和技能相关。健康相关因素是整体健康的基础，技能相关因素则提升特定活动中的表现。
| Health-Related (English) | 健康相关 (中文) |
|---|---|
| Cardiovascular Endurance | 心血管耐力 |
| Muscular Strength | 肌肉力量 |
| Muscular Endurance | 肌肉耐力 |
| Flexibility | 柔韧性 |
| Body Composition | 身体成分 |
| Skill-Related (English) | 技能相关 (中文) |
|---|---|
| Agility | 灵敏性 |
| Balance | 平衡性 |
| Coordination | 协调性 |
| Power | 爆发力 |
| Reaction Time | 反应时 |
| Speed | 速度 |
For most sports, a combination of these components is needed. For example, a footballer requires cardiovascular endurance, agility and coordination.
大多数运动都需要多种体能组合。例如，足球运动员需要心血管耐力、灵敏性和协调性。
3. Principles of Training | 训练原则
The SPORT principles help you design effective training: Specificity, Progression, Overload, Reversibility and Tedium.
SPORT 原则有助于设计有效训练：专项性、渐进性、超负荷、可逆性和单调性（多样性）。
Specificity means training must be relevant to the sport or goal.
专项性是指训练必须与运动项目或目标相关。
Progression involves gradually increasing the training stimulus as the body adapts.
渐进性是指随着身体适应，逐步增加训练刺激。
Overload requires working the body harder than normal to cause improvement. This can be guided by the FITT principle: Frequency, Intensity, Time and Type.
超负荷要求对身体施加超出常规的压力以引起提升，可通过 FITT 原则来指导：频率、强度、时间和类型。
Reversibility means that fitness gains are lost when training stops.
可逆性意味着一旦停止训练，已获得的体能会消退。
Tedium reminds us to vary training to avoid boredom and maintain motivation.
单调性提醒我们需要变换训练以避免枯燥、保持动力。
4. Methods of Training | 训练方法
Continuous training involves steady, moderate-intensity exercise without rest, improving cardiovascular endurance.
持续训练指无间歇的、中等强度的稳定运动，能提高心血管耐力。
Interval training alternates periods of high-intensity work with recovery, developing speed and anaerobic fitness.
间歇训练以高强度运动与恢复期交替进行，可发展速度和无氧体能。
Circuit training is a series of exercises performed in stations, targeting different muscle groups and components of fitness.
循环训练是在不同站点依次进行多种练习，针对不同肌群和体能要素。
Weight training uses resistance to build muscular strength, endurance or power.
负重训练利用阻力来增强肌肉力量、耐力或爆发力。
Flexibility training, such as static and dynamic stretching, increases range of motion at joints.
柔韧性训练（如静态和动态拉伸）能增大关节活动幅度。
5. The Skeletal System | 骨骼系统
The skeleton provides support, protection, movement, blood cell production and mineral storage.
骨骼提供支撑、保护、运动、血细胞生成和矿物质储存功能。
Key bones include the cranium, clavicle, scapula, humerus, vertebral column, pelvis, femur, tibia and fibula.
主要骨骼包括头骨、锁骨、肩胛骨、肱骨、脊柱、骨盆、股骨、胫骨和腓骨。
Joints are where bones meet. Ball-and-socket joints (e.g., shoulder, hip) allow movement in many directions. Hinge joints (e.g., knee, elbow) allow flexion and extension. Pivot joints (e.g., neck) allow rotation.
关节是骨与骨的连接处。球窝关节（如肩、髋）允许多方向运动；铰链关节（如膝、肘）允许屈伸；枢轴关节（如颈椎）允许旋转。
6. The Muscular System | 肌肉系统
Skeletal muscles are voluntary and produce movement by pulling on bones. Smooth and cardiac muscles work involuntarily.
骨骼肌是随意肌，通过牵拉骨骼产生运动；平滑肌和心肌则为不随意肌。
Major muscles include the deltoid, biceps, triceps, pectorals, abdominals, quadriceps, hamstrings, gastrocnemius and gluteals.
主要肌肉有三角肌、肱二头肌、肱三头肌、胸大肌、腹直肌、股四头肌、腘绳肌、腓肠肌和臀大肌。
Antagonistic pairs work together: when one muscle contracts (agonist), the opposite muscle relaxes (antagonist). Example: in a bicep curl, the biceps is the agonist and the triceps is the antagonist.
拮抗肌成对配合：当一块肌肉收缩（主动肌），相反肌肉则放松（拮抗肌）。例如在肱二头肌弯举中，肱二头肌为主动肌，肱三头肌为拮抗肌。
7. The Cardiovascular System | 心血管系统
The cardiovascular system consists of the heart, blood vessels and blood. It transports oxygen, nutrients and waste products.
心血管系统由心脏、血管和血液组成，负责运输氧气、营养物质和代谢废物。
olume is the amount of blood pumped per beat. Cardiac output = Heart Rate x Stroke Volume.
心率是每分钟心跳次数，每搏输出量是每次心跳泵出的血量，心输出量 = 心率 × 每搏输出量。
During exercise, heart rate and stroke volume increase to deliver more oxygen to working muscles.
运动时，心率和每搏输出量上升，为工作肌肉输送更多氧。
Regular aerobic training lowers resting heart rate and increases stroke volume, making the heart more efficient.
经常进行有氧训练可降低安静心率，增加每搏输出量，使心脏效率更高。
8. The Respiratory System | 呼吸系统
Breathing in (inhalation): the diaphragm contracts and flattens, the intercostal muscles lift the ribs, increasing chest volume and drawing air into the lungs.
吸气时：膈肌收缩变平，肋间外肌上提肋骨，胸腔容积增大，空气进入肺部。
Breathing out (exhalation): the diaphragm relaxes and domes upward, intercostal muscles relax, reducing chest volume and pushing air out.
呼气时：膈肌松弛上升，肋间肌放松，胸腔容积减小，气体被排出。
Gas exchange occurs in the alveoli, where oxygen passes into the blood and carbon dioxide passes out.
气体交换发生在肺泡，氧气进入血液而二氧化碳离开血液。
Tidal volume is the amount of air inhaled and exhaled in a normal breath; vital capacity is the maximum amount exhaled after a maximum inhalation.
潮气量是平静呼吸时吸入或呼出的气量；肺活量是最大吸气后尽力呼出的最大气量。
9. Movement Analysis | 动作分析
Levers help us understand how muscles produce movement. A lever has a fulcrum (pivot), effort (force) and load (resistance).
杠杆帮助我们理解肌肉如何产生运动。杠杆包括支点、动力点和阻力点。
First-class lever: fulcrum is between effort and load – e.g., nodding the head.
第一类杠杆：支点位于动力点和阻力点之间，例如点头动作。
Second-class lever: load is between fulcrum and effort – e.g., standing on tiptoes.
第二类杠杆：阻力点位于支点和动力点之间，例如提踵站立。
Third-class lever: effort is between fulcrum and load – e.g., bicep curl. Most body movements use third-class levers.
第三类杠杆：动力点位于支点和阻力点之间，例如肱二头肌弯举。大多数身体动作都属于第三类杠杆。
Movement also occurs in planes: sagittal (forward-backward motions), frontal (side-to-side) and transverse (rotational).
运动还在不同平面内进行：矢状面（前后运动）、额状面（左右运动）和横切面（旋转运动）。
10. Nutrition and Hydration | 营养与补水
Carbohydrates are the body's main energy source, stored as glycogen in muscles and liver.
碳水化合物是身体的主要能源，以糖原形式储存在肌肉和肝脏中。
Proteins are essential for growth and repair of tissues.
蛋白质对组织的生长和修复至关重要。
Fats provide a concentrated energy source and support cell function, but excess can lead to weight gain.
脂肪提供浓缩能源并支持细胞功能，但过量摄入会导致体重增加。
Vitamins and minerals (micronutrients) support many body processes, such as calcium for bones and iron for oxygen transport.
维生素和矿物质（微量营养素）支持多种身体过程，如钙促进骨骼健康，铁负责氧运输。
Water regulates body temperature, transports nutrients and removes waste. Adequate hydration before, during and after exercise is vital.
水调节体温、运输营养并排除废物。运动前中后充分补水至关重要。
11. Safety and Injury Prevention | 安全与损伤预防
Always warm up before activity to prepare the body and reduce injury risk.
运动前务必热身，使身体做好准备并降低受伤风险。
Wear appropriate protective equipment and correct footwear, and check equipment for damage.
穿戴合适的防护装备和正确的运动鞋，并检查器材是否完好。
Follow the rules of the activity and use correct technique to prevent overuse and acute injuries.
遵守活动规则并使用正确技术，以防止慢性劳损和急性损伤。
Common sports injuries include sprains (ligaments), strains (muscles/tendons) and fractures (bones).
常见运动损伤包括扭伤（韧带）、拉伤（肌肉/肌腱）和骨折。
The RICE method is used for initial treatment: Rest, Ice, Compression, Elevation.
初期处理可使用 RICE 原则：休息、冰敷、加压、抬高。
12. Warm-up and Cool-down | 热身与整理活动
A warm-up has three phases: pulse-raising exercises to increase heart rate and blood flow, dynamic stretches to mobilise joints, and sport-specific drills.
热身包括三个阶段：脉冲提升练习以增加心率和血流量、动态拉伸以活动关节，以及专项技能练习。
Warming up improves muscle elasticity, reaction time and mental focus.
热身可改善肌肉弹性、反应速度和心理专注度。
A cool-down involves low-intensity exercise to gradually lower heart rate, followed by static stretching to prevent stiffness and aid recovery.
整理活动包括低强度运动以逐步降低心率，随后进行静态拉伸，防止僵硬并促进恢复。
Effective cool-down helps remove waste products like lactic acid and reduces muscle soreness.
有效的整理活动有助于清除乳酸等代谢废物，并减轻肌肉酸痛。
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