📚 Definition, Investigation and Analysis in Cambridge PE | 体育中的定义、调查与分析
In Cambridge Physical Education, the phrase 'definition, investigation and analysis' describes a core academic skill cycle: you must first define key concepts accurately, then investigate performance through observation or testing, and finally analyse the results to identify strengths, weaknesses and areas for improvement. This process is central to coursework, practical performance assessment and written examinations.
在剑桥体育课程中，“定义、调查与分析”描述了一个核心学术技能循环：你必须首先准确界定关键概念，然后通过观察或测试来调查运动表现，最后分析结果以找出优势、劣势及需要改进的方面。这一过程对于课程作业、实践表现评估和笔试都至关重要。
1. Why Definitions Matter in Physical Education | 为什么体育中的定义重要
A precise definition in PE establishes a shared vocabulary. For example, defining cardiovascular endurance as 'the ability of the heart and lungs to supply oxygen to working muscles during sustained exercise' allows you to distinguish it from muscular endurance, which concerns repeated contractions of a specific muscle group.
体育中精确的定义建立了一套共同的语言。例如，将心血管耐力定义为“心脏和肺部在持续运动中向工作肌肉供氧的能力”，这使你能将其与肌肉耐力区分开来，后者涉及特定肌群的重复收缩。
Without clear definitions, investigations become vague. If you simply say a performer is 'unfit', you have not described which fitness component needs testing or why. A good definition should include the physiological or biomechanical mechanism and, where possible, a measurable outcome or unit.
没有清晰的定义，调查就会变得模糊。如果你只是说一名运动员“体能不足”，你并没有说明需要测试哪项体能组成或原因。一个好的定义应包括生理或生物力学机制，并在可能的情况下包含可测量的结果或单位。
| Definition element | Example |
| Term | Cardiovascular endurance |
| Mechanism | Heart and lungs supply oxygen to working muscles |
| Condition | During sustained exercise |
| Measurable outcome | VO₂ max, distance in 12-minute run |
2. Key Definitions: Health-Related Fitness Components | 关键定义：健康相关体能组成
Health-related fitness components affect overall health and daily functioning. The five commonly recognised components in Cambridge PE are body composition, cardiovascular endurance, flexibility, muscular endurance and muscular strength. Each must be defined clearly because they are tested in different ways.
健康相关体能组成影响整体健康和日常功能。剑桥体育中通常公认的五个组成部分是身体成分、心血管耐力、柔韧性、肌肉耐力和肌肉力量。每一项都必须清晰定义，因为它们的测试方式各不相同。
- Body composition is the ratio of fat mass to fat-free mass; it is often assessed using BMI, skinfold callipers or bioelectrical impedance.
- 身体成分是脂肪质量与去脂质量的比例；通常通过 BMI、皮褶卡尺或生物电阻抗进行评估。
- Cardiovascular endurance is the ability of the heart, lungs and blood vessels to deliver oxygen during prolonged activity; it is measured by the multi-stage fitness test or Cooper 12-minute run.
- 心血管耐力是心脏、肺和血管在长时间活动中输送氧的能力；通过多阶段体能测试或库珀 12 分钟跑进行测量。
- Flexibility is the range of movement around a joint; it is measured by the sit-and-reach test or goniometry.
- 柔韧性是关节周围的活动范围；通过坐位体前屈测试或角度计测量。
- Muscular endurance is the ability of a muscle group to sustain repeated contractions; it is measured by the one-minute sit-up or press-up test.
- 肌肉耐力是肌群维持反复收缩的能力；通过一分钟仰卧起坐或俯卧撑测试测量。
- Muscular strength is the maximum force a muscle can exert in a single effort; it is measured by the hand grip dynamometer or one-repetition maximum.
- 肌肉力量是肌肉在单次用力时能产生的最大力量；通过握力计或单次最大重量测试测量。
You can calculate BMI using the equation below, but remember it does not distinguish muscle from fat and is less valid for heavily muscled athletes.
你可以用以下公式计算 BMI，但请记住它不能区分肌肉和脂肪，对于肌肉发达的运动员效度较低。
BMI = body mass (kg) ÷ height² (m²)
3. Key Definitions: Skill-Related Fitness Components | 关键定义：技能相关体能组成
Skill-related fitness components support sports performance and motor control. They include agility, balance, coordination, power, reaction time and speed. These are often more specific to particular activities than health-related components, so your definitions should link to the demands of the sport.
技能相关体能组成支持运动表现和动作控制。它们包括敏捷性、平衡、协调性、爆发力、反应时间和速度。这些通常比健康相关组成更具活动特定性，因此你的定义应与运动项目的需求联系起来。
- Agility is the ability to change direction quickly and control the body; it is tested by the Illinois agility run.
- 敏捷性是快速改变方向并控制身体的能力；通过伊利诺伊敏捷跑测试。
- Balance is the ability to maintain the centre of mass over the base of support, either statically or dynamically.
- 平衡是使重心保持在支撑面之上的能力，可分为静态平衡和动态平衡。
- Coordination is the smooth integration of sensory information and muscle action to produce efficient movement.
- 协调性是感觉信息与肌肉动作的顺畅整合，以产生高效动作。
- Power ng is the rate of doing work, expressed as force × velocity; it is tested by the vertical jump or Wingate test.
- 爆发力是做功的速率，表示为力 × 速度；通过垂直纵跳或温盖特测试测量。
- Reaction time is the time between a stimulus and the beginning of the movement response; it is measured by the ruler drop test.
- 反应时间是刺激出现到动作反应开始之间的时间；通过尺子下落测试测量。
- Speed is the rate of movement over a distance, often measured by a 30 m sprint.
- 速度是移动一段距离的速率，通常通过 30 米冲刺测量。
Use these definitions to decide which components most determine success in a chosen activity. A defender in football may prioritise agility and reaction time, while a 100 m sprinter may prioritise speed and power.
使用这些定义来判断哪些组成对你所选活动的成功最为关键。足球后卫可能更重视敏捷性和反应时间，而 100 米短跑运动员则更重视速度和爆发力。
4. Defining and Classifying Movement Skills | 运动技能的定义与分类
In Cambridge PE, a movement skill is a voluntary, goal-directed action learned through practice. Classification helps you analyse the skill demands of a sport. Skills can be classified along continua: open–closed, gross–fine, discrete–serial–continuous, and self-paced–externally paced.
在剑桥体育中，运动技能是一种通过练习习得的、有目的、自愿的动作。分类有助于你分析一项运动对技能的要求。技能可以沿连续体进行分类：开放–封闭、粗大–精细、分立–序列–连续，以及自我节奏–外部节奏。
- Open skills are performed in unpredictable, changing environments, such as a hockey pass in open play.
- 开放技能是在不可预测、变化的环境中完成的，例如曲棍球比赛中的传球。
- Closed skills are performed in stable, predictable environments, such as a free throw in basketball.
- 封闭技能是在稳定、可预测的环境中完成的，例如篮球罚球。
- Gross skills involve large muscle groups, such as jumping; fine skills involve small muscle groups, such as throwing a dart.
- 粗大技能涉及大肌群，如跳跃；精细技能涉及小肌群，如投掷飞镖。
- Discrete skills have a clear beginning and end, such as a golf swing; serial skills are sequences of discrete actions, such as a gymnastics floor routine; continuous skills have no obvious end, such as cycling.
- 分立技能有明确的开始和结束，如高尔夫挥杆；序列技能是由分立动作组成的序列，如体操自由操；连续技能没有明显的结束，如骑自行车。
Classifying a skill before investigating it allows you to choose appropriate observation strategies. An open skill may require analysis of decision-making under pressure, while a closed skill may require analysis of technique consistency.
在调查之前对技能进行分类，可让你选择适当的观察策略。开放技能可能需要分析压力下的决策，而封闭技能可能需要分析技术的稳定性。
5. Investigation: Designing a Performance Profile | 调查：设计运动表现档案
A performance profile is a systematic investigation tool used in Cambridge PE to compare a performer's current abilities against the demands of their activity. It usually lists key fitness components, technical skills and tactical understanding, each rated on a scale from 1 to 10.
运动表现档案是剑桥体育中一种系统的调查工具，用来将运动员当前能力与其活动要求进行对比。它通常列出关键体能组成、技术技能和战术理解，每项按 1 到 10 分进行评分。
To build a profile, first identify the demands of the sport. For a football midfielder, relevant components might include cardiovascular endurance, agility, coordination and passing accuracy. Then rate the performer on each component using evidence from observation or fitness test results.
要建立档案，首先要识别运动项目的要求。对于一名足球中场球员，相关组成可能包括心血管耐力、敏捷性、协调性和传球准确性。然后根据观察证据或体能测试结果对运动员每项表现进行评分。
| Component | Importance to football midfield | Performer rating /10 |
| Cardiovascular endurance | High - covers 10–12 km per match | 6 |
| Agility | High - rapid changes of direction | 5 |
| Passing accuracy | High - maintains possession | 7 |
The gap between importance and current rating indicates an area for investigation. If cardiovascular endurance is rated highly important but only 6/10, that becomes a priority for further testing and analysis.
重要性与当前评分之间的差距就是需要调查的领域。如果心血管耐力被认为非常重要但只有 6/10，那么这就是进一步测试和分析的重点。
6. Data Collection Methods in PE Investigation | 体育调查中的数据收集方法
Valid investigation requires reliable data. In Cambridge PE, data collection methods fall into two broad categories: quantitative data, such as times, distances and scores, and qualitative data, such as coach ratings, video observations and self-assessments.
有效的调查需要可靠的数据。在剑桥体育中，数据收集方法分为两大类：定量数据，如时间、距离和分数；定性数据，如教练评分、视频观察和自我评估。
- Fitness tests produce objective numerical data, for example a 12-minute Cooper run distance or a sit-and-reach score.
- 体能测试产生客观的数值数据，例如库珀 12 分钟跑的距离或坐位体前屈得分。
- Video analysis allows frame-by-frame observation of technique and tactical decisions; it can be coded to count successful and unsuccessful actions.
- 视频分析可以对技术和战术决策进行逐帧观察；可以通过编码来统计成功和不成功的动作。
- Questionnaires and rating scales capture perceived effort, confidence or motivation; these are more subjective and must be interpreted carefully.
- 问卷和评分量表记录主观用力感、自信心或动机；这些数据更为主观，必须谨慎解读。
- Heart rate monitors provide quantitative data on exercise intensity, which can be compared with target heart rate zones.
- 心率监测器提供关于运动强度的定量数据，可与目标心率区间进行比较。
When collecting data, control extraneous variables such as time of day, footwear, surface and warm-up. If a test is repeated, ensure the same protocol is used so results are comparable.
收集数据时，要控制额外变量，如一天中的时间、鞋类、场地和热身。如果重复测试，确保使用相同的测试方案，以便结果可以比较。
7. Qualitative and Quantitative Analysis | 定性与定量分析
Analysis means interpreting data, not just listing it. Quantitative analysis uses numbers and statistics, such as comparing a Cooper run score of 2,100 m to a normative table. Qualitative analysis uses descriptions and observations, such as 'the performer drops the left elbow during the forehand drive'.
分析意味着解读数据，而不仅仅是罗列数据。定量分析使用数字和统计，例如将库珀跑 2,100 米的得分与常模表进行比较。定性分析使用描述和观察，例如“运动员在正手击球时左肘下垂”。
Both types should be combined. A sprinter may have a fast 30 m time of 4.3 s, which is strong quantitative evidence, but qualitative video analysis may show a poor start position that limits further improvement. The two perspectives together produce a richer analysis.
两种类型应结合使用。一名短跑运动员 30 米成绩为 4.3 秒，这是强有力的定量证据，但定性视频分析可能显示起跑姿势不佳，限制了进一步提高。两种视角结合能产生更丰富的分析。
score increases from 45 cm to 50 cm, the percentage change is (50 − 45) ÷ 45 × 100 = 11.1%.
分析定量数据时，可计算提高百分比或与个人最好成绩进行比较。例如，如果垂直纵跳成绩从 45 厘米提高到 50 厘米，变化百分比为 (50 − 45) ÷ 45 × 100 = 11.1%。
Percentage change = (new value − old value) ÷ old value × 100
8. Using Normative Data and Benchmarks | 使用常模数据与基准
Normative data are published values from large populations that allow a performer's score to be interpreted. For example, a Cooper 12-minute run normative table might classify males aged 16–19 as 'excellent' above 2,800 m, 'good' at 2,400–2,800 m, and 'fair' at 2,000–2,400 m.
常模数据是来自大规模人群的已发布数值，可用来解读运动员的成绩。例如，库珀 12 分钟跑常模表可能将 16 至 19 岁男性分为：2,800 米以上为“优秀”，2,400 至 2,800 米为“良好”，2,000 至 2,400 米为“中等”。
Using benchmarks gives your analysis context. A hand grip score of 45 kg means little alone; compared with a normative table, it may be 'above average' for a 15-year-old female but 'below average' for a 20-year-old male. Always state the source and population of the normative data.
使用基准能为你的分析提供背景。单独一个 45 公斤的握力分数意义不大；与常模表相比，它可能对于 15 岁女性“高于平均”，但对于 20 岁男性“低于平均”。务必说明常模数据的来源和适用人群。
Caution: normative data may come from different countries, years or sport levels. A national talent table may be unrealistic for a school performer. Use the most relevant comparison available and justify your choice.
注意：常模数据可能来自不同国家、年份或运动水平。国家级人才表对学校运动员可能不现实。应使用最相关的比较，并说明选择理由。
9. Analysing Strengths and Weaknesses | 分析优势与劣势
A strong analysis identifies both strengths and weaknesses, not just the lowest score. A weakness is usually a component that is highly important to the activity but shows a low current rating or test score relative to the norm. A strength is a component that is important and shows a high rating or test score.
有力的分析应同时指出优势和劣势，而不仅仅是最低分。劣势通常是对活动非常重要但当前评分或测试成绩相对于常模较低的组成。优势则是对活动重要且评分或测试成绩较高的组成。
For each weakness, state why it matters for performance. Do not just write 'my speed is poor'. Write: 'My 30 m sprint time of 4.8 s is below the age-group average of 4.4 s, which means I am slower to the ball in tennis and often lose court position.' This links evidence to sport-specific consequences.
对于每一项劣势，说明它为什么对表现重要。不要只写“我的速度差”。要写：“我的 30 米冲刺时间为 4.8 秒，低于同年龄组平均 4.4 秒，这意味着我在网球中移动接球较慢，常常失去场上位置。”这就把证据与运动特定后果联系起来。
- Use test data or observation evidence for every claim.
- 每一个判断都要使用测试数据或观察证据。
- Compare the performer to normative standards or their own previous baseline.
- 将运动员与常模标准或自身之前的基线进行比较。
- Avoid jargon and emotional language; say 'needs improvement' rather than 'terrible'.
- 避免使用术语和情绪化语言；说“需要改进”而不是“糟糕”。
10. Cause and Effect: Linking Fitness to Performance | 因果关系：将体能与表现联系起来
Investigation and analysis often reveal correlations between fitness scores and performance. However, correlation does not always equal causation. A low sit-and-reach score may coincide with poor hurdling technique, but the flexibility deficit may not be the only cause; hip strength and timing also matter.
调查与分析常常揭示体能分数与表现之间的相关性。然而，相关性并不总是等于因果关系。坐位体前屈得分低可能与跨栏技术差同时出现，但柔韧性不足可能不是唯一原因；髋部力量和时机也很重要。
To build a causal argument, you need controlled reasoning. If a footballer has low cardiovascular endurance scores and observation shows performance declines in the final 15 minutes, the cause is plausible because the physiological demand matches the observed effect. State it as 'likely contributes to' rather than definite causation unless you have experimental evidence.
要建立因果论证，你需要有控制的推理。如果一名足球运动员心血管耐力得分较低，并且观察到其表现在最后 15 分钟下降，那么这个原因是合理的，因为生理需求与观察到的效果相符。表述为“可能导致”而不是确定的原因，除非你有实验证据。
| Evidence | Possible link | Causal strength |
| Low cardiovascular endurance + late-game drop in speed | Fatigue impairs work rate | Strong |
| Low grip strength + poor throwing distance | Grip limits force transfer | Moderate |
| Low flexibility + slow swim turns | Tight hips restrict tuck | Plausible but needs technique analysis |
Always support a causal claim with more than one data source. Combine test scores, match statistics and qualitative observation to strengthen your conclusion.
始终用多个数据来源支持因果断言。将测试成绩、比赛统计和定性观察相结合，以强化你的结论。
11. Validity, Reliability and Fairness in Analysis | 分析中的效度、信度与公平性
For an investigation to be credible, its methods must be valid, reliable and fair. Validity refers to whether a test measures what it claims to measure. Reliability refers to the consistency of results when the test is repeated. Fairness means all performers are assessed under the same conditions.
调查要具有可信度，其方法必须有效、可靠且公平。效度指测试是否测量了它声称要测量的东西。信度指重复测试时结果的一致性。公平性意味着所有运动员在相同条件下接受评估。
- Validity: The hand grip dynamometer is valid for muscular strength but not for cardiovascular endurance.
- 效度：握力计对肌肉力量有效，但对心血管耐力无效。
- Reliability: If a sit-and-reach test is performed once with a cold warm-up and once after a 15-minute warm-up, the results may differ; standardise the warm-up.
- 信度：如果坐位体前屈一次在冷身时测试，另一次在 15 分钟热身后测试，结果可能不同；应标准化热身。
- Fairness: A 30 m sprint timed by hand is less consistent than electronic timing, so use the same timing method for all participants.
- 公平性：手计时 30 米冲刺比电子计时一致性差，因此所有参与者应使用相同的计时方法。
When critiquing an investigation, identify threats to validity and reliability. For example, using BMI for a rugby prop may overestimate body fat because muscle mass is high. This limitation should be mentioned in your analysis.
在评判一项调查时，要指出对效度和信度的威胁。例如，对橄榄球支柱前锋使用 BMI 可能高估体脂，因为他们肌肉质量很高。分析中应提到这一局限性。
12. Presenting and Justifying Analysis | 呈现与证明分析
Your analysis should be presented clearly using tables, charts or radar diagrams, followed by written justification. A radar chart is useful for performance profiles because it shows multiple components at once and highlights gaps between importance and current rating.
你的分析应使用表格、图表或雷达图清晰地呈现，并附上书面说明。雷达图对运动表现档案很有用，因为它能同时显示多个组成，并突出重要性与当前评分之间的差距。
When writing, follow a simple structure: state the finding, give the evidence, interpret the meaning, and link to sport performance. For example: 'The sit-and-reach score was 18 cm, which is below the 16–19 male average of 26 cm. This suggests tight hamstrings and lower back, which
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