spirometer trace interpretation
4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.
Lesson Overview
Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Learning Objectives
- Explain the key ideas of spirometer trace interpretation
- Apply spirometer trace interpretation to exam-style questions
- Develop independent study skills
- Build cross-topic connections
Prerequisites
- Read the revision notes for spirometer trace interpretation first (GCSE Revise summary)
- Key vocab to pre-teach: Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV)
- Basic skills: reading the summary notes and answering the practice questions there
Materials & Equipment
- Exercise book, coloured pens
- Ruler
- Printed revision notes (link below)
- Internet for videos (see Resources)
Lesson 1: Introduction: spirometer trace interpretation
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Write down everything you already know about spirometer trace interpretation. Then check against the key terms: Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV). Use a mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV).
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Before lesson: Read the script below. Pre-teach key vocab: Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV).
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: spirometer trace interpretation. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Physical Education because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
Mins 0-5 - Hook: "Today: spirometer trace interpretation. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Physical Education because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
First Look
Start with the revision notes summary, then attempt: Define tidal volume and state its approximate value at rest.
Plenary (5 minutes)
Check Out
Your student states one thing they learned and one question they still have about spirometer trace interpretation.
Lesson 2: Core Concepts: spirometer trace interpretation
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from Lesson 1 on spirometer trace interpretation. Check them against the notes below.
Main Content (35 minutes)
Definition: A spirometer is a device that measures the volume of air inspired and expired by the lungs. It produces a graph (spirometer trace) showing the volume of air breathed over time.
Tidal Volume (TV): The volume of air breathed in or out per breath at rest. Approximately 500 ml for an average adult.
Inspiratory Reserve Volume (IRV): The additional volume of air that can be forcibly inhaled after a normal tidal inspiration. Approximately 2,500-3,000 ml .
Expiratory Reserve Volume (ERV): The additional volume of air that can be forcibly exhaled after a normal tidal expiration. Approximately 1,000-1,500 ml .
Residual Volume (RV): The volume of air remaining in the lungs after maximum forced expiration. Approximately 1,200-1,500 ml . This air cannot be expelled - it keeps the lungs partially inflated to prevent collapse.
At Rest: The spirometer trace shows small, regular waves. Each wave represents one breathing cycle (one inspiration + one expiration). The height of each wave represents the tidal volume (~500 ml). The waves are evenly spaced and of similar height, showing steady, relaxed breathing.
| Term | Meaning | Example |
|---|---|---|
| Tidal Volume (TV) | Volume of air per normal breath at rest | 500 ml |
| Inspiratory Reserve Volume (IRV) | Extra air that can be inhaled after normal inspiration | 3,000 ml |
| Expiratory Reserve Volume (ERV) | Extra air that can be exhaled after normal expiration | 1,500 ml |
| Residual Volume (RV) | Air remaining after maximum expiration | 1,200 ml |
| Vital Capacity (VC) | TV + IRV + ERV = maximum air that can be moved | 5,000 ml |
| Total Lung Capacity (TLC) | VC + RV = total air in fully inflated lungs | 6,000 ml |
| Tidal Volume | 500 ml | 2,000-3,000 ml (increases significantly) |
| Breathing Rate | 12-15 breaths/min | 40-50+ breaths/min |
Practice (10 minutes)
Q: Define tidal volume and state its approximate value at rest.
Answer: Tidal volume is the volume of air breathed in or out per breath during normal resting breathing. Its approximate value is 500 ml.
Plenary (5 minutes)
Explain Back
Your student teaches the key points back to you without looking. Fill any gaps immediately.
Lesson 3: Application: spirometer trace interpretation
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Recall the key terms: Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV). Define each in one sentence.
Main Content (35 minutes)
Parent/Teacher Guide: Let your student attempt each question alone first, then compare with the model answer. Award method marks for correct working even if the final answer is wrong.
Q1: Define tidal volume and state its approximate value at rest.
Answer: Tidal volume is the volume of air breathed in or out per breath during normal resting breathing. Its approximate value is 500 ml.
Q2: What is the difference between inspiratory reserve volume and expiratory reserve volume?
Answer: Inspiratory reserve volume (IRV) is the extra air that can be forcibly inhaled after a normal tidal inspiration (~3,000 ml). Expiratory reserve volume (ERV) is the extra air that can be forcibly exhaled after a normal tidal expiration (~1,200 ml).
Q3: Calculate vital capacity given: TV = 500 ml, IRV = 3,000 ml, ERV = 1,200 ml.
Answer: VC = TV + IRV + ERV = 500 + 3,000 + 1,200 = 4,700 ml.
Q4: Why does residual volume not change during exercise?
Answer: Residual volume does not change during exercise because it is the air that always remains in the lungs after maximum forced expiration. It cannot be expelled - its purpose is to keep the lungs partially inflated to prevent them from collapsing.
Q5: Describe two changes you would see on a spirometer trace when someone transitions from rest to exercise.
Answer: The height (amplitude) of each wave increases because tidal volume has increased. The frequency of the waves increases (waves are closer together) because the breathing rate has increased.
Q6: Calculate minute ventilation during exercise if tidal volume is 2,200 ml and breathing rate is 42 breaths/min.
Answer: Minute ventilation = 2,200 × 42 = 92,400 ml/min = 92.4 l/min.
Plenary (5 minutes)
Error Review
Review any questions answered incorrectly. Identify whether the error was knowledge, method, or reading the question.
Lesson 4: Exam Practice: spirometer trace interpretation
Duration: 50 minutes
Starter Activity (5 minutes)
Command Words
Review what these command words require: state (one point), describe (say what happens), explain (say why), compare (both sides), evaluate (judgement).
Main Content (35 minutes)
Exam-Style Question
Attempt a past-paper style question on spirometer trace interpretation from the exam board past paper finder (see Resources), then mark it against the scheme.
Exam Tips: Know the definitions and approximate values for all lung volumes | The vital capacity formula (VC = TV + IRV + ERV) is frequently tested | Residual volume is NEVER included in vital capacity calculations | When describing spirometer traces, mention both height/amplitude AND frequency | Practise minute ventilation calculations (TV × breathing rate) | Remember: residual volume does NOT change during exercise or with training
Common Errors: Watch Out! Students often think lactic acid causes doms. Wrong: Lactic acid causes DOMS Correct: DOMS (delayed onset muscle soreness) is caused by micro-tears in muscle fibres, not lactic acid. Lactic acid is cleared within an hour of exercise. Students often think veins always carry deoxygenated blood. Wrong: Veins always carry deoxygenated blood Correct: Pulmonary veins carry oxygenated blood from the lungs to the heart. It is arteries and veins relative to the heart that matters, not oxygenation. Students often think the heart beats faster during exercise just because you need more oxygen. Wrong: The heart beats faster during exercise just because you need more oxygen Correct: Heart rate
Stretch & Challenge (Grade 8-9):
- Synoptic links: explain how spirometer trace interpretation connects to another Physical Education topic you have studied
- Real-world: research one real-world use or example of spirometer trace interpretation
- Critical: "What are the limitations of the models used in spirometer trace interpretation?"
Plenary (5 minutes)
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts - re-run Lesson 2
Homework & Consolidation
- Consolidation: Re-answer any Lesson 3 practice questions answered incorrectly (20 mins)
- Retrieval: Write flashcards for the key terms: Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV) (10 mins)
- Exam practice: One past-paper question on spirometer trace interpretation from the board websites (15 mins)
- Extension: Explain spirometer trace interpretation to someone else in your own words (10 mins)