Year 9 Cambridge Physical Education: Core Knowledge Summary | Year 9 剑桥体育：核心知识点梳理

📚 Year 9 Cambridge Physical Education: Core Knowledge Summary | Year 9 剑桥体育：核心知识点梳理

Year 9 Physical Education in the Cambridge curriculum develops a strong foundation in both practical performance and theoretical understanding. Students explore how the body works during exercise, the principles of training, fitness components, and the psychological factors that influence sport. This article summarises the core knowledge areas you need to master, helping you prepare for assessments and deepen your enjoyment of physical activity.

剑桥 Year 9 体育课程在实践表现和理论学习两方面打下坚实基础。学生将探索身体在运动中的工作机制、训练原则、体能要素以及影响运动的心理因素。本文梳理了需要掌握的核心知识领域，帮助你为评估做好准备，并加深对体育活动的理解与热爱。

1. The Skeletal System | 骨骼系统

The human skeleton provides support, protection, movement, mineral storage and blood cell production. It consists of 206 bones divided into the axial skeleton (skull, rib cage, spine) and the appendicular skeleton (limbs, shoulder, pelvis).

人体骨骼提供支撑、保护、运动、矿物质储存和血细胞生成等功能。骨骼由 206 块骨头组成，分为中轴骨（颅骨、胸廓、脊柱）和附肢骨（四肢、肩带、骨盆）。

Key bones include the cranium, clavicle, scapula, humerus, radius, ulna, vertebrae (cervical, thoracic, lumbar), pelvis, femur, patella, tibia, fibula, tali, and phalanges. Being able to label these on a diagram is essential.

关键骨骼包括颅骨、锁骨、肩胛骨、肱骨、桡骨、尺骨、椎骨（颈椎、胸椎、腰椎）、骨盆、股骨、髌骨、胫骨、腓骨、距骨和指/趾骨。能够准确在图上标记这些骨骼至关重要。

Functions in detail: support – bones form a rigid framework that holds the body upright; protection – the skull encloses the brain, the rib cage shields the heart and lungs; movement – bones act as levers when muscles pull on them; mineral storage – calcium and phosphorus are stored for strength; blood cell production – red and white blood cells are made in the bone marrow.

详细功能：支撑 – 骨骼构成坚硬框架，维持身体直立；保护 – 颅骨保护大脑，胸廓保护心脏和肺脏；运动 – 骨骼在肌肉牵拉下充当杠杆；矿物质储存 – 储存钙和磷以增强骨骼硬度；血细胞生成 – 骨髓产生红细胞和白细胞。

2. The Muscular System | 肌肉系统

Muscles are responsible for movement by contracting and pulling on bones across joints. We focus on skeletal (voluntary) muscles, which are under conscious control. Smooth and cardiac muscles work involuntarily.

肌肉通过收缩并牵拉跨关节的骨骼来产生运动。我们重点关注骨骼肌（随意肌），它们受意识支配。平滑肌和心肌则不受意念控制。

Major muscles to learn: deltoid, pectoralis major, biceps brachii, triceps brachii, rectus abdominis, obliques, quadriceps, hamstrings, gluteus maximus, gastrocnemius, and latissimus dorsi. Knowing their locations and actions helps analyse sporting techniques.

需掌握的主要肌肉：三角肌、胸大肌、肱二头肌、肱三头肌、腹直肌、腹斜肌、股四头肌、腘绳肌、臀大肌、腓肠肌和背阔肌。了解其位置与功能有助于分析运动技术。

Antagonistic pairs: muscles work in pairs on opposite sides of a joint. When one muscle contracts as the agonist (prime mover), the other relaxes as the antagonist. For example, during elbow flexion, the biceps is agonist and triceps is antagonist; during extension, roles reverse.

拮抗肌对：肌肉在关节对侧成对工作。一块肌肉收缩成为主动肌（原动肌）时，另一块放松成为拮抗肌。例如，肘关节屈曲时，肱二头肌为主动肌、肱三头肌为拮抗肌；伸展时角色互换。

Types of muscle contraction: isotonic (muscle changes length, e.g., lifting weights), which includes concentric (shortening) and eccentric (lengthening); and isometric (muscle contracts but length stays the same, e.g., plank).

肌肉收缩类型：等张收缩（肌肉长度变化，如举重）包括向心收缩（缩短）和离心收缩（拉长）；等长收缩（肌肉收缩但长度不变，如平板支撑）。

3. Joints and Movement | 关节与运动

A joint is where two or more bones meet. Synovial joints contain synovial fluid, cartilage, a joint capsule and ligaments. They allow a range of free movement and are the main focus in sport.

关节是两块或多块骨头相互连接的地方。滑膜关节含有滑液、软骨、关节囊和韧带，能进行大范围的活动，是运动中最主要的关节类型。

Synovial joint types: hinge (elbow, knee, ankle) allows flexion and extension; ball-and-socket (shoulder, hip) allows flexion, extension, abduction, adduction, rotation and circumduction; pivot (atlanto-axial joint in neck) allows rotation; gliding/plane (carpals of wrist) allows slight sliding movements.

滑膜关节类型：屈戌/铰链关节（肘、膝、踝）允许屈伸；球窝关节（肩、髋）允许屈、伸、外展、内收、旋转和环转；枢轴关节（颈部寰枢关节）允许旋转；滑动关节（腕骨）允许轻微滑动。

Movement terms everyone should know: flexion (decreasing the angle at a joint), extension (increasing the angle), abduction (moving away from the body’s midline), adduction (moving towards the midline), rotation (turning around the long axis), circumduction (circular movement combining flexion, extension, abduction and adduction), plantarflexion (pointing toes down) and dorsiflexion (lifting toes up).

必须掌握的运动术语：屈曲（减小关节角度）、伸展（加大角度）、外展（远离身体中线）、内收（靠近中线）、旋转（绕长轴转动）、环转（结合屈、伸、外展、内收的圆周运动）、跖屈（脚尖向下点地）和背屈（脚尖上翘）。

Connective tissues: ligaments link bone to bone, providing stability; tendons attach muscle to bone, transmitting force; cartilage cushions the joint and reduces friction.

结缔组织：韧带连接骨与骨，提供稳定性；肌腱连接肌肉与骨，传递力量；软骨缓冲关节并减少摩擦。

4. The Cardiorespiratory System | 心肺系统

The cardiorespiratory system comprises the heart, blood vessels (arteries, veins, capillaries) and lungs. Its primary function is to deliver oxygen and nutrients to working muscles and remove carbon dioxide and waste products.

心肺系统由心脏、血管（动脉、静脉、毛细血管）和肺组成。其主要功能是为工作的肌肉输送氧气和营养物质，并移除二氧化碳和代谢废物。

The heart has four chambers: right atrium, right ventricle, left atrium, left ventricle. Unidirectional flow is maintained by valves. The pulmonary circuit carries blood to the lungs; the systemic circuit supplies the rest of the body. Heart rate (HR) is the number of beats per minute.

心脏有四个腔室：右心房、右心室、左心房、左心室。瓣膜保证血液单向流动。肺循环将血液运送到肺部；体循环为身体其余部分供血。心率（HR）是每分钟心跳次数。

During exercise, HR increases to pump more oxygenated blood. Stroke volume (SV) is the amount of blood ejected per beat. Cardiac output (Q) = HR × SV. Maximal heart rate can be estimated using:

HRmax ≈ 220 − age (in years)

运动时心率上升以泵送更多含氧血。每搏输出量（SV）是每次心跳射出的血量。心输出量（Q）= HR × SV。最大心率可通过以下公式估算：

HRmax ≈ 220 − 年龄（岁）

Breathing mechanics: inhalation involves the diaphragm contracting (flattening) and intercostal muscles raising the ribs; exhalation is passive at rest as the diaphragm relaxes. Tidal volume (TV) is air per breath; minute ventilation (VE) = TV × breathing rate. During exercise, both TV and breathing rate rise sharply.

呼吸机制：吸气时膈肌收缩（变平），肋间肌上提肋骨；安静呼气是被动的，膈肌放松。潮气量（TV）是每次呼吸的空气量；每分通气量（VE）= TV × 呼吸频率。运动时，潮气量和呼吸频率均急剧上升。

Gaseous exchange occurs in the alveoli: oxygen diffuses into the capillaries, and carbon dioxide diffuses out. A fitter individual has a more efficient cardiorespiratory system, resulting in a lower resting HR and quicker recovery.

气体交换在肺泡进行：氧气扩散进入毛细血管，二氧化碳扩散出来。心肺功能更佳的个体心肺系统效率更高，安静心率更低且恢复更快。

5. Health-related Fitness | 健康相关体能

Health-related fitness components affect daily functioning and well-being. They are:

Cardiovascular endurance – the ability of the heart and lungs to deliver oxygen during sustained activity.
Muscular strength – the maximal force a muscle can exert in a single contraction.
Muscular endurance – the ability to perform repeated muscle contractions without fatigue.
Flexibility – the range of motion available at a joint.
Body composition – the proportion of fat mass to lean mass (muscle, bone, organs).

健康相关体能要素影响日常生活和健康水平，包括：

心血管耐力 – 心脏和肺在长时间活动中供氧的能力。
肌肉力量 – 肌肉在单次收缩中能发挥的最大力量。
肌肉耐力 – 重复肌肉收缩而不疲劳的能力。
柔韧性 – 关节可达到的活动范围。
身体成分 – 脂肪质量与瘦体重（肌肉、骨骼、器官）的比例。

Common tests: multi-stage fitness test (beep test) for cardiovascular endurance; 1-rep max for strength; sit-up or press-up test for muscular endurance; sit-and-reach test for flexibility; and skinfold callipers or BMI for body composition. Interpreting results against normative tables helps set improvement goals.

常用测试：多阶段体能测试（蜂鸣测试）测心血管耐力；1RM 测力量；仰卧起坐或俯卧撑测肌肉耐力；坐位体前屈测柔韧性；皮褶卡尺或体重指数测身体成分。对照常模表解读结果有助于设定提升目标。

6. Skill-related Fitness | 技能相关体能

Skill-related fitness components are more sport-specific and enhance performance quality. They include agility, balance, coordination, power, reaction time and speed. All can be improved with targeted practice.

技能相关体能要素更具项目针对性，可提升运动表现质量，包括灵敏性、平衡性、协调性、爆发力、反应时间和速度。这些均可通过针对性训练得到提升。

Definitions: Agility is the ability to change direction rapidly and accurately (test: Illinois agility test). Balance is maintaining the centre of mass over the base of support, either static or dynamic. Coordination is the smooth integration of sensory information and muscular action. Power = strength × speed, i.e., explosive strength (test: vertical jump). Reaction time is the interval between a stimulus and the initiation of movement. Speed is the rate at which a person covers distance (test: 30 m sprint).

各要素定义：灵敏性是快速准确改变方向的能力（伊利诺伊灵敏测试）。平衡性是在支撑面内维持重心的能力，分静态和动态平衡。协调性是感觉信息与肌肉动作的流畅整合。爆发力 = 力量 × 速度，即爆发性力量（纵跳测试）。反应时间是刺激与动作起始之间的间隔。速度是人体通过某段距离的快慢（30 m 冲刺测试）。

While health-related fitness underpins overall health, skill-related fitness determines success in specific activities. A gymnast needs exceptional balance and coordination; a sprinter relies on power, reaction time and speed.

健康相关体能是整体健康的基础，而技能相关体能则决定专项运动中的成绩。体操运动员需要出色的平衡与协调；短跑运动员依赖于爆发力、反应时间和速度。

7. Principles of Training | 训练原则

Effective training programmes follow the SPORT principles: Specificity (training must match the demands of the sport), Progression (gradually increase workload as fitness improves), Overload (work beyond normal levels to stimulate gains), Reversibility (fitness declines if training stops), and Tedium (variety prevents boredom). Additionally, individual differences and the need for rest/recovery must be considered.

有效的训练计划遵循 SPORT 原则：专项性（训练必须符合运动项目要求）、渐进性（随体能提升逐步增加负荷）、超负荷（超过正常水平进行训练以刺激提升）、可逆性（停止训练体能会下降）和枯燥性（多样化训练可避免乏味）。此外还需考虑个体差异和休息恢复。

Overload is applied using the FITT variables: Frequency (how often), Intensity (how hard), Time (how long each session), and Type (mode of exercise). For cardiovascular endurance, intensity is often set using heart rate zones. The aerobic training zone is typically 60–80% of HRmax.

超负荷通过 FITT 变量实现：频率（多久一次）、强度（多剧烈）、时间（每次多久）和类型（运动方式）。对心血管耐力来说，强度常用心率区间设定。有氧训练区间通常为 HRmax 的 60–80%。

Target Heart Rate = HRmax × desired percentage (e.g., 0.70 for 70%)

目标心率 = 最大心率 × 目标百分比（如 0.70 对应 70%）

Progression should be gradual: no more than 10% increase in training load per week to avoid injury. Regular reassessment ensures the programme remains suited to the athlete’s level.

渐进应循序渐进：每周训练负荷增量不超过 10%，以免受伤。定期重新评估可保证训练计划始终适合运动员的水平。

8. Nutrition and Hydration | 营养与水分补充

A balanced diet provides the fuel and nutrients needed for exercise and recovery. The main macronutrients are carbohydrates, proteins and fats. Micronutrients (vitamins and minerals), fibre and water are equally important.

均衡饮食为运动和恢复提供所需的燃料和营养。主要宏量营养素是碳水化合物、蛋白质和脂肪。微量营养素（维生素与矿物质）、膳食纤维和水同样重要。

Carbohydrates: primary energy source, stored as glycogen in muscles and liver. Complex carbs (whole grains) provide sustained energy.
Proteins: essential for muscle repair and growth. Sources: lean meat, fish, eggs, beans.
Fats: provide energy for low-intensity, long-duration activities. Unsaturated fats are healthier.

碳水化合物：主要能量来源，以糖原形式储存在肌肉和肝脏。复合碳水化合物（全谷物）提供持久能量。
蛋白质：对肌肉修复与生长至关重要。来源：瘦肉、鱼、蛋、豆类。
脂肪：为低强度长时间运动供能。不饱和脂肪更健康。

Hydration directly affects performance. Water regulates body temperature and transports nutrients. Dehydration of even 2% body mass can impair concentration, coordination and endurance. Athletes should drink before, during (small amounts) and after exercise, using urine colour as a simple hydration guide (pale straw is ideal).

水分补充直接影响运动表现。水调节体温并运输营养。即使脱水 2% 体重也可能损害专注力、协调性和耐力。运动员应在运动前、中（少量多次）、后饮水，以尿液颜色作为简便的补水指标（淡稻草色为理想）。

For exercise lasting over 60–90 minutes, sports drinks containing carbohydrates and electrolytes can help maintain energy and fluid balance. Caffeine and energy drinks are not recommended for young athletes because of potential side effects.

运动超过 60–90 分钟时，含碳水化合物和电解质的运动饮料有助于维持能量和液体平衡。不推荐青少年运动员饮用含咖啡因和功能饮料，因其有潜在副作用。

9. Injury Prevention and Treatment | 损伤预防与处理

Preventing injury starts with a thorough warm-up: gentle cardiovascular activity to raise heart rate, dynamic stretches to increase range of motion, and sport-specific drills. The cool-down should include light jogging and static stretching to gradually lower heart rate and reduce muscle stiffness.

预防损伤从充分的热身开始：低强度心肺活动以提高心率、动态拉伸增大活动范围，以及专项性练习。整理活动应包括慢跑和静态拉伸，逐步降低心率并减轻肌肉僵硬。

Other preventive measures: using correct technique, wearing appropriate protective equipment (helmets, shin pads,

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Year 9 Cambridge Physical Education: Core Knowledge Summary | Year 9 剑桥体育：核心知识点梳理