Lesson Notes By Weeks and Term v3 - Junior Secondary 2
Posture and postural defects
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Posture and postural defects
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Subject: Physical & Health Education
Class: Junior Secondary 2
Term: 1st Term
Week: 9
Theme: Basic Human Movement
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explain the meaning of posture and postural defects demonstrate appropriate posture in sitting, standing, walking. describe postural defects like kyphosis, lordosis, scoliosis, flat feet. explain the causes of postural defects
Basic Human Movement at school (e.g., using benches, desks) and at home (e.g., chairs, tables for study) and suggest ergonomic improvements, even simple ones like using a cushion for back support or ensuring feet are flat on the floor. This understanding can reduce strain during long hours of study or chores.
3. Community Health and Awareness: Students can become advocates for good posture within their families and communities. They can observe elderly relatives or market women and discuss how their posture might be affecting them, or how correct lifting techniques could prevent injury. This knowledge can be shared to prevent common musculoskeletal issues prevalent in communities where manual labour and traditional carrying methods are common.
8. Differentiation, Remediation and Extension
A. Differentiation: Visual Learners: Use clear diagrams, charts, and real-life images/videos of good posture and postural defects. Demonstrate extensively.
Auditory Learners: Provide clear verbal explanations, encourage class discussions, and use story-telling examples related to local contexts.
Kinesthetic Learners: Emphasize practical demonstrations, hands-on practice, and peer-to-peer correction activities. Allow them to physically adjust their posture and observe others.
Group Work: Divide students into small groups to discuss causes and solutions, allowing peer teaching and varied participation.
B. Remediation: Re-explanation: For students struggling with understanding specific defects, re-explain concepts using simpler language and more relatable examples.
Simplified Practice: Provide additional, simplified practice questions focusing on identifying defects from pictures or short descriptions.
One-on-One/Small Group Support: Work with struggling learners individually or in small groups to reinforce concepts and provide guided practice on demonstrating correct postures.
Visual Aids Repetition: Re-show diagrams and models of the spine to help them visualise the defects.
Focus on Key Terms: Ensure they can define "posture" and "postural defects" and identify at least two types and causes.
C. Extension/Enrichment: Research Project: High-achieving learners can research specific exercises or stretches that can help correct or prevent certain postural defects. They can present their findings to the class.
Poster Campaign: Task students with designing a "Good Posture Awareness" poster for the school or community, illustrating correct postures and warning against common defects.
Interview: Encourage students to interview a local physiotherapist or health worker about the prevalence of postural defects in Nigeria and common treatment methods. * Ergonomic Design Challenge: Challenge students to think about how school furniture could be redesigned or modified to promote better posture, considering local materials and costs. look like an 'S' or 'C' shape.
Flat Feet (Pes Planus): The arch on the inside of the foot collapses, so the entire sole touches the ground.
Commentary: This question targets Objective 3, requiring identification and a basic understanding of each defect.
4. Question: Mention two common causes of kyphosis that you might observe in students in Nigeria.
Solution: Carrying heavy school bags incorrectly: For example, carrying a heavy bag only on one shoulder, or with loose straps that cause the bag to sag, forcing the student to lean forward.
Prolonged slouching while sitting: Students often lean over desks or sit in chairs without adequate back support, leading to a rounded upper back over time.
Commentary: This question addresses Objective 4, connecting causes to local context.
5. Independent Practice (Questions Only)
1. Define posture and explain why it is important.
2. Differentiate between good posture and postural defects.
3. List four characteristics of good sitting posture.
4. Describe what good walking posture looks like.
5. Name four types of postural defects.
6. Explain what kyphosis is and state two of its causes.
7. What is lordosis? Identify one group of people commonly affected by it.
8. Describe scoliosis and explain how it differs from kyphosis and lordosis.
9. List three factors that can contribute to a child developing flat feet.
1
0. Suggest three general causes of poor posture among Nigerian students.
6. Evaluation and Assessment
A. Formative Assessment: Observation: The teacher observes students' demonstrations of sitting, standing, and walking postures during practical activities, noting their ability to apply corrective measures.
Question and Answer: The teacher asks probing questions during discussions to check understanding of definitions, types, and causes of defects.
Peer Assessment: Students assess each other's posture during practical sessions and provide constructive feedback.
B. Summative Assessment (End-of-Lesson Quiz/Short Test): Instructions: Answer all questions.
1. Explain the meaning of posture and postural defects. (4 marks)
Marking Scheme: 2 marks for a clear definition of posture, 2 marks for a clear definition of postural defects.
2. Demonstrate three kinds of posture (standing, sitting, walking). (3 marks)
Marking Scheme: 1 mark for each correctly demonstrated posture (observing key features).
3. List three postural defects. (3 marks)
Marking Scheme: 1 mark for each correctly listed defect (e.g., Kyphosis, Lordosis, Scoliosis, Flat Feet).
4. List three causes of postural defects. (3 marks)
Marking Scheme: 1 mark for each correctly listed cause (e.g., poor posture habits, heavy loads, inadequate furniture, lack of exercise, malnutrition, ill-fitting footwear).
5. List three corrective measures for postural defects. (3 marks)
Marking Scheme: 1 mark for each relevant corrective measure (e.g., specific exercises, physiotherapy, ergonomic adjustments, braces, surgery for severe cases).
6. Mention three preventive measures for postural defects. (3 marks)
Marking Scheme: 1 mark for each relevant preventive measure (e.g., maintaining good posture, regular exercise, balanced diet, carrying loads correctly, using appropriate furniture, wearing supportive footwear).
Total Marks: 19 marks
7. Real-life Applications / Integration
1. Daily Activities and Health: This topic directly relates to students' daily lives. Good posture is vital when carrying heavy loads (e.g., school bags, market items like buckets of water or foodstuffs on the head), prolonged sitting in classrooms, fetching water, or engaging in chores. Poor posture can lead to chronic back pain, neck pain, fatigue, and even affect breathing or digestion in the long term, impacting their ability to learn and participate in activities.
2. Ergonomics in School and Home: The principles of good posture can be applied to create healthier learning and living environments. Students can assess their seating arrangements at school (e.g., using benches, desks) and at home (e.g., chairs, tables for study) and suggest ergonomic improvements, even simple ones like using a cushion for back support or ensuring feet are flat on the floor. This understanding can reduce strain during long hours of study or chores.
3. Community Health and Awareness: Students can become advocates for good posture within their families and communities. They can observe elderly relatives or market women and discuss how their posture might be affecting them, or how correct lifting techniques could prevent injury. This knowledge younger individuals.
Certain Diseases: Tuberculosis of the spine (Pott's disease).
Impact: Can lead to back pain, stiffness, reduced lung capacity, fatigue, and affect self-esteem.
2. Lordosis (Swayback): Description: An excessive inward curvature of the lower spine (lumbar region), causing the abdomen to protrude forward and the buttocks to appear more prominent.
Causes: Obesity: Excess weight around the abdominal area pulls the spine forward.
Pregnancy: The growing uterus shifts the centre of gravity, leading to an exaggerated curve.
Weak Abdominal Muscles: When core muscles are weak, the pelvis tilts forward, increasing the lumbar curve.
Tight Hip Flexors: Muscles at the front of the hip can pull the pelvis forward.
High Heels: Prolonged wearing of high-heeled shoes can alter pelvic tilt.
Poor Posture: Prolonged standing or sitting in a swayback position.
Impact: Can cause lower back pain, muscle spasms, and affect mobility.
3. Scoliosis: Description: A sideways curvature of the spine, often resembling an 'S' or 'C' shape. It can also involve a rotation of the vertebrae, causing one shoulder or hip to appear higher than the other.
Causes: Idiopathic: Most common type, meaning the cause is unknown (often genetic).
Congenital: Present at birth due to vertebral malformation.
Neuromuscular Conditions: Diseases affecting muscles and nerves, like cerebral palsy or muscular dystrophy.
Leg Length Discrepancy: One leg being shorter than the other can cause a compensatory spinal curve.
Injuries or Infections: Can sometimes lead to scoliosis.
Impact: Can cause back pain, uneven shoulders/hips, breathing difficulties in severe cases, and cosmetic concerns.
4. Flat Feet (Pes Planus): Description: A condition where the arch on the inside of the foot collapses, causing the entire sole of the foot to touch the ground when standing. The foot may appear to roll inward (pronation).
Causes: Genetics: Often inherited.
Weak Arches: Ligaments supporting the arch may be too flexible or stretched.
Injuries: Trauma to the foot or ankle.
Obesity: Excess weight puts pressure on the arches.
Prolonged Standing: Occupations requiring long hours of standing (e.g., market vendors, security personnel).
Ill-fitting Footwear: Wearing shoes that do not provide adequate arch support.
Age: Arches may flatten with age.
Impact: Can lead to foot pain, ankle pain, knee pain, shin splints, and difficulty with prolonged walking or running.
D. General Causes of Postural Defects (Summary)
Poor Postural Habits: Slouching, leaning, sitting incorrectly for long periods.
Heavy Loads: Carrying heavy school bags or other loads incorrectly.
Inadequate Furniture: Chairs and desks that are not ergonomically suitable (common in many Nigerian schools and homes).
Lack of Exercise: Weak core and back muscles cannot adequately support the spine.
Sedentary Lifestyle: Prolonged sitting weakens supporting muscles.
Malnutrition: Can affect bone and muscle development (e.g., rickets can lead to bone deformities).
Ill-fitting Clothing/Footwear: Tight clothing restricting movement, shoes without proper support (e.g., very flat sandals, high heels).
Injuries or Trauma: Accidents can lead to spinal misalignments.
Genetic Factors: Predisposition to certain conditions.
Overweight/Obesity: Adds strain to the spine and joints.
Certain Medical Conditions: E.g., cerebral palsy, polio, muscular dystrophy.
3. Teaching and Learning Activities
A. Introduction (10 minutes)
1. Teacher Activity: Begin by asking students how they usually sit, stand, and walk. Prompt them to consider if there's a "right" or "wrong" way.
Ask: "Why do some people have a bent back, or walk with a strange gait?"
2. Student Activity: Students share their observations and initial thoughts. A few volunteers demonstrate their typical sitting, standing, and walking postures.
B. Content Development (30 minutes)
1. Teacher Activity (Posture): Define "posture" and "good posture" using clear language.
Demonstrate good standing posture: Head up, shoulders back and relaxed, chest slightly out, abdomen in, knees soft, weight balanced.
Demonstrate good sitting posture: Back against the chair's backrest (if available), feet flat, knees bent at 90 degrees, shoulders relaxed. If no backrest, emphasize sitting upright and engaging core muscles.
Demonstrate good walking posture: Head up, looking forward, shoulders relaxed, arms swinging, heel-to-toe movement. * Emphasise the importance of