Lesson Notes By Weeks and Term v4 - SHS 3
Scientific Basis of Physical Activity
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Scientific Basis of Physical Activity
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Subject: Physical Education Health Elective
Class: SHS 3
Term: 2nd Term
Week: 10
Grade code: 3.2.3.LI.2
Strand code: 2
Sub-strand code: 3
Content standard code: 3.2.3.CS.1
Indicator code: 3.2.3.LI.2
Theme: Physical Education
Subtheme: Scientific Basis of Physical Activity
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Welcome, future sports scientists, coaches, and health professionals! Today, we are moving beyond simply playing sports to understanding the science behind *how* our bodies move. This field is called Kinesiology. Understanding kinesiology is like a mechanic understanding how a car engine works. For an athlete, it's the key to unlocking better performance, preventing injuries, and achieving peak physical potential. In our Ghanaian context, think about the powerful shots of a Black Stars player, the graceful jumps in a game of ampe, or the strength needed for traditional dances. Kinesiology explains the science behind all these movements.
This section breaks down the core ideas you need to understand. What is Kinesiology?
Definition: Kinesiology is the scientific study of human movement. The word comes from two Greek words: 'Kinesis' (meaning movement) and '-logia' (meaning study of).
Simply put, Kinesiology explores how and why the body moves. It looks at the body as a machine and studies its structure, function, and the forces that act upon it. The Core Components of Kinesiology
For our purpose in Physical Education, we will focus on three fundamental components: Anatomy What it is: Anatomy is the study of the structure of the body. It's like learning the names and locations of all the parts of a car engine. In kinesiology, we focus on the musculoskeletal system: bones, joints, muscles, ligaments, and tendons. Why it matters in PE: You cannot improve what you don't understand. Knowing which muscles are responsible for a specific action allows you to train them effectively. For example, knowing that the *quadriceps* (front thigh muscles) are key for kicking a ball helps a footballer focus on squats and leg extensions to increase kicking power. Ghanaian Example: In a game of ampe, the powerful upward jump requires strong contraction of the gastrocnemius (calf muscle) and the quadriceps. The clapping motion involves the pectoralis major (chest muscles) and deltoids (shoulder muscles). An injury to any of these muscles will directly affect a player's performance. Physiology (specifically, Exercise Physiology) What it is: Physiology is the study of how the body and its parts function. Exercise Physiology looks specifically at how the body responds and adapts to physical activity. It answers questions like: "Where does our energy come from?" and "Why do we get tired?" Why it matters in PE: This helps us understand concepts like warming up, cooling down, endurance, and fatigue. A proper warm-up increases blood flow to the muscles (a physiological response), preparing them for intense activity and reducing injury risk. Understanding energy systems helps a coach decide whether a 100m sprinter (who uses the anaerobic system for short bursts of power) should train differently from a marathon runner (who relies on the aerobic system for endurance). Ghanaian Example: Imagine the Black Stars playing a crucial match in the hot Kumasi sun. An exercise physiologist would advise on hydration strategies to prevent dehydration, which severely impacts performance. They would also plan half-time recovery strategies to replenish energy stores for the second half. Biomechanics What it is: Biomechanics is the study of the mechanical laws relating to the movement or structure of living organisms. It applies principles of physics (like force, levers, momentum, and gravity) to human movement. Why it matters in PE: This is where we learn to make movement more *efficient* and *effective*. It is the science of technique. By understanding biomechanics, we can analyse a high jumper's technique to help them clear a greater height or a shot putter's spin to help them throw farther. Key Biomechanical Concepts: Levers: Our bones, joints, and muscles work together as levers to create movement. A joint acts as the fulcrum (pivot point), and muscles provide the effort (force) to move a load (a limb or an object like a ball or javelin). Centre of Gravity (COG): This is the imaginary point where the body's mass is concentrated. A lower COG increases stability. A defender in football often adopts a low crouch (like an Agama lizard) to lower their COG, making them harder to push over. Force: To move, we must generate force. To jump high, you must apply a large force against the ground. The ground then pushes back with an equal and opposite force (Newton's Third Law), propelling you upwards. Ghanaian Example (Worked): Analysing a Football Throw-in Anatomy: The *latissimus dorsi* (back muscle), *deltoids* (shoulders), *triceps* (back of the arm), and core muscles are all engaged. Physiology: The body uses the anaerobic energy system for this quick, powerful movement. Biomechanics: The player creates a long lever with their arms and body to maximise the distance the ball travels. They arch their back and use their entire body to generate force, transferring it from their legs, through their core, to their arms, and finally to the ball. A stable base (feet firmly planted) is crucial for maximum force transfer.