📚 Year 9 OCR PE: Core Knowledge Review | Year 9 OCR 体育：核心知识点梳理
Year 9 marks an important stage in the OCR Physical Education course, where learners begin to build the theoretical foundations that will support their GCSE studies. This article brings together the core topics you need to master at this stage, from the skeletal and muscular systems to the components of fitness and basic training principles. Each section offers clear explanations in both English and Chinese to help you reinforce your understanding and prepare confidently for assessments.
九年级是 OCR 体育课程的关键阶段，学生开始建立支撑 GCSE 学习所需的理论基础。本文汇集了现阶段需要掌握的核心主题，包括骨骼与肌肉系统、体能要素以及基本的训练原则。每个部分都提供清晰的中英双语解释，帮助你巩固理解，自信地迎接考核。
1. The Skeletal System and Its Functions | 骨骼系统及其功能
The human skeletal system is made up of 206 bones that provide a framework for the body. For Year 9 OCR PE, you need to know its seven key functions: support, protection, movement, mineral storage, blood cell production, structural shape, and posture.
人体骨骼系统由 206 块骨骼组成，为身体提供支架。在九年级 OCR 体育中，你需要了解它的七项主要功能：支撑、保护、运动、矿物质储存、血细胞生成、结构形状和姿势保持。
Support means bones hold the body upright and support the weight of tissues. Protection refers to vital organs being shielded, such as the cranium protecting the brain. Movement is enabled when muscles pull on bones across joints. Mineral storage involves calcium and phosphorus stored in bones. Blood cell production occurs in bone marrow. The skeleton also gives the body its shape and helps maintain correct posture during activity.
支撑是指骨骼保持身体直立并支撑组织重量。保护指重要器官受到遮蔽，例如颅骨保护大脑。运动是通过肌肉拉动关节处的骨骼实现的。矿物质储存涉及骨骼中储存的钙和磷。血细胞生成发生在骨髓中。骨骼还赋予身体形状，并帮助在活动中维持正确姿势。
2. Bone Types and Joints | 骨骼类型与关节
Bones can be classified into four main types: long bones (e.g., femur, humerus), short bones (e.g., carpals, tarsals), flat bones (e.g., cranium, ribs, scapula), and irregular bones (e.g., vertebrae). Each type has a role linked to its shape.
骨骼可分为四种主要类型：长骨（如股骨、肱骨）、短骨（如腕骨、跗骨）、扁骨（如颅骨、肋骨、肩胛骨）和不规则骨（如椎骨）。每种类型因其形状而具有相应的作用。
A joint is where two or more bones meet. Synovial joints are freely movable and are the focus in sport. The main synovial joints to know are the hinge joint (elbow, knee) and the ball-and-socket joint (shoulder, hip). Hinge joints allow flexion and extension, while ball-and-socket joints permit movement in many directions, including rotation.
关节是两块或多块骨骼的连接处。滑膜关节可以自由活动，是运动中的重点。需要了解的主要滑膜关节是屈戌关节（肘、膝）和球窝关节（肩、髋）。屈戌关节允许屈伸运动，而球窝关节允许多方向的运动，包括旋转。
3. Movements at Joints | 关节的动作
Understanding movement terminology helps analyse sporting actions. Flexion decreases the angle at a joint (bending the elbow), while extension increases it (straightening the knee). Abduction is movement away from the midline of the body, and adduction is movement towards the midline.
理解动作术语有助于分析运动动作。屈指减小关节角度（屈肘），伸指增大关节角度（伸直膝盖）。外展是肢体远离身体中线的运动，内收是肢体靠向身体中线的运动。
Rotation involves turning a limb around its long axis, such as turning the head. Circumduction is a combination of flexion, extension, abduction and adduction, as seen in a cricket bowling action. Plantarflexion points the toes down (standing on tiptoes), and dorsiflexion pulls the toes up towards the shin.
旋转是指肢体绕其长轴转动，例如转头。环转是屈、伸、外展和内收的组合，如板球投球动作。跖屈是脚尖向下（脚尖站立），背屈是脚尖向上朝胫骨方向运动。
4. The Muscular System and Major Muscles | 肌肉系统与主要肌肉
The muscular system works with the skeleton to produce movement. There are three types of muscle: cardiac (involuntary, found only in the heart), smooth (involuntary, in walls of organs), and skeletal (voluntary, attached to bones). In PE we focus on skeletal muscles.
肌肉系统与骨骼协同产生运动。肌肉有三种类型：心肌（不随意肌，只存在于心脏）、平滑肌（不随意肌，位于器官壁中）和骨骼肌（随意肌，附着于骨骼）。在体育中我们主要关注骨骼肌。
Key muscles to identify and understand include the deltoid (shoulder), pectorals (chest), latissimus dorsi (back), biceps (front of upper arm), triceps (back of upper arm), abdominals (stomach), quadriceps (front of thigh), hamstrings (back of thigh), gluteals (buttocks), and gastrocnemius (calf).
需要辨认和理解的关键肌肉包括三角肌（肩部）、胸大肌（胸部）、背阔肌（背部）、肱二头肌（上臂前侧）、肱三头肌（上臂后侧）、腹肌（腹部）、股四头肌（大腿前侧）、腘绳肌（大腿后侧）、臀肌（臀部）和腓肠肌（小腿）。
5. Antagonistic Muscle Pairs | 拮抗肌对
Muscles can only pull, never push, so they work in pairs to produce coordinated movement. The muscle that contracts to cause movement is the agonist (prime mover), while the muscle that relaxes and lengthens is the antagonist.
肌肉只能拉，不能推，因此它们成对工作以产生协调运动。收缩引起运动的肌肉是主动肌（原动肌），而放松并延长的肌肉是拮抗肌。
A classic example is the biceps and triceps pair. During elbow flexion (bending the arm), the biceps acts as the agonist and the triceps is the antagonist. During extension, the roles reverse. Similarly, the quadriceps and hamstrings work as antagonists during knee movements.
典型例子是肱二头肌和肱三头肌这对。在屈肘（弯臂）时，肱二头肌为主动肌，肱三头肌为拮抗肌；在伸肘时角色互换。同样，股四头肌和腘绳肌在膝关节运动中互为拮抗肌。
6. The Cardiovascular System | 心血管系统
The cardiovascular system consists of the heart, blood vessels and blood. Its main function is to transport oxygen, nutrients and waste products around the body. For Year 9, you need to know the double circulatory system and the basic structure of the heart.
心血管系统由心脏、血管和血液组成。其主要功能是在全身运输氧气、养料和废物。九年级需要了解双循环系统以及心脏的基本结构。
The heart has four chambers: right atrium, right ventricle, left atrium and left ventricle. Deoxygenated blood returns to the right side and is pumped to the lungs. Oxygenated blood returns to the left side and is pumped to the rest of the body. Arteries carry blood away from the heart, veins carry blood back, and capillaries allow exchange of substances.
心脏有四个腔室：右心房、右心室、左心房和左心室。去氧血液返回右侧，并被泵送至肺部。充氧血液返回左侧，并被泵送至全身各处。动脉将血液带离心脏，静脉将血液送回，毛细血管则进行物质交换。
Heart rate is the number of beats per minute (bpm). Stroke volume is the amount of blood pumped per beat. Cardiac output is the volume pumped per minute, calculated as:
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。心输出量是每分钟泵出的血量，计算公式为：
Cardiac output = heart rate × stroke volume
7. The Respiratory System and Breathing | 呼吸系统与呼吸
The respiratory system brings oxygen into the body and removes carbon dioxide. Air travels through the nose/mouth, trachea, bronchi and bronchioles before reaching the alveoli in the lungs, where gas exchange takes place.
呼吸系统将氧气带入体内并排出二氧化碳。空气依次通过鼻/口、气管、支气管和细支气管，到达肺部的肺泡，在那里进行气体交换。
During inhalation, the diaphragm contracts and flattens, and the intercostal muscles raise the ribs, increasing chest volume so air rushes in. During exhalation, these muscles relax, reducing chest volume and pushing air out. This process supports the increased oxygen demand during exercise.
吸气时，横膈膜收缩并变平，肋间肌抬起肋骨，增加胸腔容积，使空气涌入。呼气时，这些肌肉放松，减小胸腔容积，将空气排出。这一过程支撑了运动时增加的氧气需求。
Tidal volume is the amount of air breathed in or out per normal breath. Vital capacity is the maximum amount of air exhaled after a maximum inhalation. Minute ventilation is the volume of air breathed in per minute. The link with heart rate underlines how the cardiovascular and respiratory systems work together.
潮气量是每次正常呼吸吸入或呼出的空气量。肺活量是最大吸气后再尽最大力呼出的气量。每分通气量是每分钟吸入的空气体积。这些指标与心率的关联凸显了心血管和呼吸系统如何协同工作。
8. Components of Fitness | 体能要素
Fitness is broken down into health-related and skill-related components. Health-related components affect your physical wellbeing and include cardiovascular endurance, muscular endurance, muscular strength, flexibility and body composition.
体能可分为健康相关要素和技能相关要素。健康相关要素影响身体健康，包括心血管耐力、肌肉耐力、肌肉力量、柔韧性和身体成分。
Cardiovascular endurance is the ability to exercise the whole body for a long time. Muscular endurance is a muscle's ability to contract repeatedly without tiring. Muscular strength is the maximum force a muscle can exert. Flexibility is the range of motion at a joint. Body composition is the proportion of fat, muscle and bone.
心血管耐力是长时间运动全身的能力。肌肉耐力是肌肉反复收缩而不疲劳的能力。肌肉力量是肌肉能施加的最大力量。柔韧性是关节的活动范围。身体成分是脂肪、肌肉和骨骼的比例。
Skill-related components are more about performance and include agility, balance, coordination, power, reaction time and speed. For example, a badminton player uses agility and reaction time, while a gymnast relies heavily on balance and coordination.
技能相关要素更关乎运动表现，包括敏捷性、平衡、协调性、爆发力、反应时间和速度。例如，羽毛球运动员运用敏捷性和反应时间，而体操运动员则高度依赖平衡和协调性。
9. Principles of Training (FITT) | 训练原则（FITT）
To improve fitness safely and effectively, training must follow key principles. The FITT principle helps plan training sessions: Frequency (how often), Intensity (how hard), Time (how long) and Type (kind of exercise).
为了安全有效地提升体能，训练必须遵循关键原则。FITT 原则帮助规划训练课程：频率（多久一次）、强度（多难）、时间（多久）和类型（何种运动）。
Specificity means training should be relevant to the sport or goal. Progressive overload means gradually increasing the stress on the body to keep improving. Reversibility means fitness is lost if training stops. Tedium (variation) reminds us to keep training interesting to maintain motivation.
专项性指训练应与运动项目或目标相关。渐进超负荷指逐渐增加身体承受的压力以持续进步。可逆性指如果停止训练，体能会下降。枯燥（多样性）提醒我们保持训练的趣味性以维持动力。
For aerobic training, a simple target training zone can be calculated using the Karvonen formula or a basic estimate. For Year 9, you can use:
对于有氧训练，可以使用卡沃宁公式或简易估算计算目标训练区间。对九年级同学，可用：
Max HR = 220 − age
Aerobic target zone = 60−80% of max HR
10. Warm-up, Cool-down and Safety | 热身、放松与安全
A proper warm-up prepares the body for exercise and reduces injury risk. It typically has three phases: a pulse raiser (light jogging), stretching (dynamic movements), and sport-specific drills. Benefits include increased blood flow to muscles, better flexibility, and mental preparation.
适当的热身能为运动做好准备并降低受伤风险。通常包含三个阶段：提升心率（轻松慢跑）、拉伸（动态活动）和专项练习。好处包括增加肌肉血流量、提高柔韧性和做好心理准备。
A cool-down returns the body to its resting state gradually. It involves low-intensity exercise to remove waste products, followed by static stretching. This helps prevent muscle soreness and speeds up recovery. Safety in physical activity also involves wearing correct kit, following rules, checking equipment and surfaces, and staying hydrated.
放松活动帮助身体逐渐恢复至静息状态。包括低强度运动以清除代谢废物，之后进行静态拉伸。这有助于防止肌肉酸痛并加速恢复。体育活动中的安全还涉及穿着正确的服装、遵守规则、检查设备与场地以及保持水分。
Published by TutorHao | PE Revision Series | aleveler.com
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