📚 Cambridge IGCSE PE: Key Points for Practical and Experimental Assessments | 剑桥IGCSE体育：实验与实践考核要点
Practical and experimental work lies at the heart of Cambridge IGCSE Physical Education, bridging the gap between theoretical knowledge and real-world sport. Whether you are conducting a fitness test, measuring recovery heart rate, or analysing a sprint start through video, you must demonstrate scientific rigour alongside physical skill. This guide walks you through the essential practical assessment components and the experimental techniques needed to achieve top marks in your coursework.
实践与实验任务是剑桥IGCSE体育课程的核心，它将理论知识与真实运动情境紧密连接。无论你是在完成体能测试、测量恢复心率，还是通过视频分析短跑起跑动作，都必须展现出科学严谨性与运动技能。本文带你逐一拆解实践考核的构成要点及必备的实验技巧，帮助你争取课程作业高分。
1. Understanding the Assessment Components | 理解考核构成
Your practical coursework typically requires you to complete four physical activities from distinct categories (e.g., games, gymnastics, athletic activities) and produce an Analysis of Performance task. Each activity is assessed on controlled skills, competitive/performance situations, and the ability to observe rules and conventions.
实践课程作业通常要求你从不同类别（如球类、体操、田径项目）选择四项体育活动，并完成一份表现分析任务。每一项活动的考核涵盖控制性技能、比赛或表演情境以及对规则与惯例的执行。
In the Analysis of Performance, you will plan and carry out experiments such as fitness tests or movement analysis, then evaluate the data to suggest improvements. This is where your experimental skills really count.
在表现分析中，你需要设计并实施体能测试或动作分析等实验，然后评估数据并提出改进建议。这正是你实验技能大显身手的地方。
2. Selecting Your Four Practical Activities | 选择四项实践活动
Choose activities that genuinely showcase your strengths and ensure they come from at least two different activity groups as specified by Cambridge. Avoid selecting two very similar sports (e.g., rugby union and rugby sevens) because they may not count as separate categories.
选择能真正展现你优势的活动，并确保它们至少来自剑桥规定的两个不同活动组别。避免选择两项高度相似的运动（如英式橄榄球联合式与七人制），因为它们可能不被视为独立类别。
Check the latest syllabus list for approved activities. If you are competing in a club outside school, gather video evidence and performance logs to support your assessment. The evidence must clearly show you under competitive conditions.
查阅最新大纲核准的活动列表。如果你在校外俱乐部参与训练或比赛，要收集视频证据和表现记录来支撑评定。材料必须清晰展示你在比赛环境中的表现。
3. Fitness Testing: Validity and Reliability | 体能测试：效度与信度
Validity refers to whether a test actually measures the fitness component it claims to measure. For example, the sit-and-reach test is a valid measure of hamstring and lower back flexibility, but it would not be a valid measure of cardiovascular endurance.
效度指测试是否真正测量了它所宣称的体能要素。例如，坐位体前屈是测量腘绳肌和下背部柔韧性的有效工具，但用它来测量心血管耐力则无效。
Reliability means that the test produces consistent results when repeated under the same conditions. To improve reliability, standardise the warm-up, use the same equipment, and conduct the test at the same time of day. Carefully calibrate instruments such as skinfold calipers or heart rate monitors before each session.
信度意味着在相同条件下重复测试能获得一致结果。为提高信度，应统一热身流程、使用相同器材并在一天中同一时段进行测试。每次测试前务必仔细校准皮褶卡钳或心率监测器等仪器。
Always record environmental factors like temperature and humidity, as they can affect performance. Informed consent and a PAR-Q (Physical Activity Readiness Questionnaire) should be completed before any maximal testing.
始终记录温度和湿度等环境因素，因为它们会影响运动表现。在进行任何极限测试前，必须完成知情同意和身体活动准备问卷（PAR-Q）。
4. Cardiovascular Endurance Tests | 心血管耐力测试
The Multistage Fitness Test (bleep test) requires you to run 20 m shuttles in time with audio beeps that gradually increase in speed. Your score is the level and shuttle number you reach before you can no longer keep pace.
多级体能测试（哔哔测试）要求你在音频节拍下进行20米折返跑，节拍速度逐步加快。你的得分是你能够跟上节奏的最后一级和折返次数。
The Cooper 12-minute run measures the maximum distance you can cover on a flat track in 12 minutes. Record the distance to the nearest 10 metres. Ensure you pace yourself evenly and avoid a sprint start.
库珀12分钟跑测量你在平坦跑道上12分钟内能够跑完的最大距离，记录精确到10米。注意保持匀速，避免起跑冲刺。
If you use the Harvard Step Test, step up and down on a 45 cm bench for up to 5 minutes at a rate of 30 steps per minute. After stopping, measure your pulse for 30 seconds at 1, 2, and 3 minutes of recovery. Calculate the fitness index:
如果采用哈佛台阶试验，你需要在45厘米高的台阶上以每分钟30次的频率上下台阶，最多持续5分钟。结束后，分别在恢复期第1、第2、第3分钟测量30秒脉搏。计算体能指数：
Index = (Duration of exercise in seconds × 100) ÷ (2 × (P₁ + P₂ + P₃))
指数 = (运动持续时间（秒）× 100) ÷ (2 × (P₁ + P₂ + P₃))
A higher index indicates better cardiovascular fitness.
指数越高，心血管机能越好。
5. Muscular Strength and Endurance Tests | 肌肉力量与耐力测试
Grip dynamometry is a common test for static hand strength. Adjust the grip to fit your hand, stand upright with the arm straight, and squeeze maximally for 2–3 seconds. Take three trials and record the best result in kilograms.
握力计是测量静态手部力量的常用测试。调整握把至合适大小，直立，手臂伸直，用最大力量紧握2–3秒。进行三次试验，记录最佳成绩（千克）。
For muscular endurance, the one-minute sit-up test or press-up test works well. Count only full repetitions performed with correct technique; if form breaks, stop counting. Use a mat and have a partner monitor the movement.
测量肌肉耐力，可使用一分钟仰卧起坐或俯卧撑测试。只计算动作规范完整的次数；动作变形立即停止计数。使用垫子，并由搭档监控动作。
When comparing results, normalise strength values relative to body weight to make fair comparisons between individuals.
在比较结果时，将力量值除以体重进行标准化，以便在不同个体间公平比较。
6. Flexibility and Body Composition Measurements | 柔韧性与身体成分测量
The sit-and-reach test, performed with a standard box or a tape measure on the floor, evaluates hamstring and lower back flexibility. Hold the stretch for 2 seconds without bouncing and record the best of three attempts to the nearest 0.5 cm.
坐位体前屈测试使用标准测量箱或地板上的卷尺，评估腘绳肌和下背柔韧性。缓慢前伸并保持2秒，不得弹动；记录三次中最好成绩，精确至0.5厘米。
Skinfold callipers measure subcutaneous fat at sites such as the triceps, subscapula, and supraspinale. Take two readings at each site; if they differ by more than 1 mm, take a third. Sum the values to estimate body fat percentage using an appropriate equation or nomogram.
皮褶卡钳测量肱三头肌、肩胛下角和髂上等部位的皮下脂肪厚度。每个部位测量两次；若两次相差大于1毫米，需测第三次。将测量值相加，使用合适的公式或列线图估算体脂百分比。
Body Mass Index (BMI) offers a quick screening tool, though it does not differentiate between fat and muscle. The formula is:
身体质量指数（BMI）是一种快速筛查工具，但不能区分脂肪与肌肉。计算公式为：
BMI = body mass (kg) ÷ height² (m²)
BMI = 体重(kg) ÷ 身高²(m²)
7. Skill-Related Fitness Experiments | 技能相关体能实验
Reaction time can be measured using a ruler drop test. A partner holds a metre ruler vertically between your thumb and forefinger, then releases it without warning. Record the distance the ruler falls before you catch it; a shorter distance indicates faster reaction time.
反应时可通过落尺实验测量。搭档将米尺垂直悬于你张开的拇指与食指之间，在无预警下释放。测量尺子下落至被你抓住的距离；距离越短，反应速度越快。
The stork balance test assesses static balance. Stand on the balls of your dominant foot with hands on hips, place the other foot against the knee, and close your eyes. Time how long you can hold the position without moving the supporting foot. Repeat three times.
鹳立测试评估静态平衡能力。双手叉腰，用优势脚前脚掌站立，另一脚抵住膝盖，闭眼。计时能保持姿势不动的时间，记录三次尝试。
For speed experimentation, a 30 m sprint with electronic timing gates provides reliable data. Always perform an active warm-up and use the same start command for each trial.
在速度实验中，使用电子计时门的30米冲刺能提供可靠数据。每次试验前必须充分进行主动热身，并使用相同的起动口令。
8. Using Heart Rate Monitors in Experiments | 在实验中使用心率监测器
A heart rate monitor is one of the most versatile tools for experimental work. Measure your resting heart rate first thing in the morning for three consecutive days and calculate the average to establish a baseline.
心率监测器是实验中最通用的工具之一。连续三天在清晨第一时刻测量安静心率，计算平均值作为基准线。
During exercise, heart rate should be monitored continuously to determine work intensity. Target heart rate zones can be calculated using the Karvonen method, but a simple estimate of maximum heart rate is:
运动中应持续监测心率以确定工作强度。目标心率区间可通过卡沃南法计算，但最大心率的简单估算为：
HRmax ≈ 220 – age (years)
最大心率 ≈ 220 – 年龄（岁）
Recovery heart rate is an excellent indicator of cardiovascular fitness. Measure how quickly your heart rate returns to near-resting levels after stopping exercise. A faster decline indicates better fitness.
恢复心率是心血管机能的绝佳指标。测量停止运动后心率下降到接近安静水平的速度；下降越快，体能越好。
9. Qualitative Movement Analysis | 定性动作分析
Qualitative analysis involves observing a movement and comparing it to an ideal technical model. Record a video of your performance in a specific sport skill, such as a basketball jump shot or a cricket bowl, from multiple angles.
定性分析需要观察动作并与理想技术模型比较。从多个角度录下你做某项运动技能的视频，例如篮球跳投或板球投球。
Break the skill into preparation, execution, and follow-through phases. Create an observation checklist with specific criteria (e.g., elbow position, knee flexion, follow-through height). Use the checklist to identify strengths and weaknesses systematically.
将技能分解为准备、执行和跟随阶段。制作一份包含具体标准的观察清单（如肘部位置、膝关节弯曲角度、跟随动作高度）。利用清单系统找出优势与弱点。
Combine your visual analysis with quantitative data where possible, e.g., measuring the angle of knee flexion using a video analysis app or protractor. Always reference the ideal model from reliable coaching literature.
尽可能将视觉分析与定量数据结合，例如使用视频分析软件或量角器测量膝关节弯曲角度。始终引用可靠教练文献中的理想模型。
10. Recording and Presenting Data | 记录与呈现数据
All raw data should be recorded immediately in a well-designed table. Tables must have clear headings, units, and consistent decimal places. For example:
所有原始数据应立即记录在设计良好的表格中。表格必须有清晰的表头、单位和一致的小数位数。例如：
| Test | Trial 1 | Trial 2 | Trial 3 | Mean |
|---|---|---|---|---|
| Grip Strength (kg) | 42.5 | 44.0 | 43.2 | 43.2 |
When plotting graphs, label both axes and use appropriate scales. A line graph is suitable for heart rate changes over time; a bar chart works well for comparing mean scores across tests. Always give your graph a descriptive title.
绘制图表时，给两个坐标轴标上名称并使用合适的刻度。随时间变化的心率数据适用折线图；比较各项测试的平均得分宜用柱状图。图表总要有描述性标题。
In your Analysis of Performance report, discuss findings with scientific reasoning. Link results to your individual preparation, technique, and the physiological principles studied in theory lessons. Suggest specific, measurable improvements.
在表现分析报告中，要用科学推理讨论发现。将结果与个人准备、技术，以及理论课所学的生理学原理联系起来。提出具体、可衡量的改进建议。
11. Common Mistakes to Avoid | 常见错误避免
One frequent mistake is performing fitness tests without a standardised warm-up, which leads to unreliable data. Always replicate the warm-up protocol exactly for every trial.
一个常见错误是不经标准化热身就进行体能测试，导致数据不可靠。每次试验必须完全复制热身方案。
Another error is selecting activities or tests that do not align with the syllabus categories. Verify your choices with your teacher before finalising your practical portfolio.
另一个错误是选择了与大纲类别不符的活动或测试。在最终确定实践作品集前，一定要找老师核对你的选择。
Avoid using uncalibrated equipment or ignoring the need for partner supervision during maximal tests. Safety is paramount; never push beyond severe discomfort or follow a protocol that contradicts medical advice.
避免使用未经校准的设备，或在进行极限测试时没有搭档监督。安全第一；感到严重不适时绝不可硬撑，也不可执行与医务建议相违背的方案。
12. Final Tips for Success | 成功小贴士
Plan your experimental sessions well in advance, allowing enough time to repeat tests if something goes wrong. Keep a detailed logbook that includes dates, conditions, equipment used, and any unusual observations.
提前规划实验环节，留出足够时间以便出错后重测。保留详细的日志本，记录日期、条件、使用器材和任何异常观察。
Practise your video analysis speech or written commentary so you can clearly explain the biomechanical and physiological factors behind your performance. Use the correct technical terminology to demonstrate depth of understanding.
练习你的视频分析口头阐述或书面评论，确保能清晰解释表现背后的生物力学和生理因素。使用正确的专业术语，展现理解的深度。
Finally, ask for feedback from your teacher on draft tables, graphs, and trial runs. Small adjustments in protocol often make a large difference to both validity and reliability.
最后，就草拟表格、图表和试运行方案向老师征求反馈。小小的方案调整常常能极大地提升效度和信度。
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