Welcome to Exercise Physiology!
Hello there! Welcome to one of the most exciting parts of your A Level PE journey. In this chapter, we are going to look at how we can fine-tune the human body like a high-performance racing car. We’ll explore what we should eat, how we should train, and how we fix the body when things go wrong. Don’t worry if some of the scientific terms look a bit scary at first—we’ll break them down step-by-step!
Quick Review: Physiology is simply the study of how the body's systems (like your heart, lungs, and muscles) work together to keep you moving.
3.2.1.1 Diet and Nutrition: Fueling Performance
Think of your body as a car. If you put the wrong fuel in a Ferrari, it won't win the race. Athletes need to understand exactly what they are putting into their "tanks."
The Six Main Food Classes
1. Carbohydrates: These are your body’s preferred fuel source. They are broken down into glucose and stored as glycogen in the muscles and liver. Example: Pasta, rice, and potatoes.
2. Fibre: It doesn't provide energy, but it keeps your digestive system moving. A healthy gut means better nutrient absorption! Example: Wholemeal bread and oats.
3. Fats: These are a major energy source for low-intensity, long-duration exercise.
• Saturated Fat: Often found in animal products; too much can lead to heart disease.
• Trans Fat: Artificial fats often found in processed snacks; very bad for heart health.
• Cholesterol: A fatty substance; high levels can block arteries (leading to strokes or heart disease).
4. Protein: The "building blocks." Essential for growth and repairing muscle tissue after a hard workout. Example: Chicken, eggs, and beans.
5. Vitamins: Essential organic compounds.
• Vitamin C: Protects cells and keeps bones healthy.
• Vitamin D: Helps absorb calcium.
• B-complex (like B-12): Helps break down food into energy.
6. Minerals: Inorganic elements.
• Calcium: Strong bones and teeth.
• Iron: Helps red blood cells carry oxygen.
• Sodium: Controls fluid levels (but too much causes high blood pressure).
7. Water: Crucial for hydration. It regulates temperature and allows chemical reactions to happen. You must hydrate before, during, and after exercise!
Dietary Supplements and Manipulation
Sometimes, "normal" food isn't enough for elite athletes. They might use these tricks:
• Glycogen Loading: Eating massive amounts of carbs a few days before an endurance event (like a marathon) to maximize glycogen stores. It’s like overfilling your fuel tank!
• Creatine: A supplement that helps the ATP-PC system work longer. Great for sprinters or weightlifters who need explosive power.
• Sodium Bicarbonate: This is basically baking soda! It helps "buffer" (neutralize) lactic acid, allowing athletes to work at high intensities for longer before feeling the "burn."
• Caffeine: A stimulant that increases alertness and can help the body use fat for fuel more efficiently.
Key Takeaway: Carbohydrates = Fuel, Protein = Repair, Fats = Long-term Energy. Supplements are tools to give an extra 1% edge.
3.2.1.2 Preparation and Training Methods
To get better at a sport, you can't just "exercise"—you have to train. This requires planning and testing.
Testing: Lab vs. Field
Athletes use tests to see if their training is working.
• Quantitative Data: Numbers and facts (e.g., "I ran 5km in 20 minutes").
• Qualitative Data: How you feel (e.g., "I felt very tired after that run").
• Objective: Facts that don't change regardless of who sees them (a stopwatch time).
• Subjective: Based on opinion (a coach saying "you looked fast today").
Did you know? For a test to be "good," it must be:
1. Valid: Does it actually measure what it claims to? (Don't use a bleep test to measure strength!)
2. Reliable: Can you repeat the test and get the same results if nothing has changed?
The Principles of Training (S.P.O.R.T)
Memorize this mnemonic to remember how to design a training program:
• S - Specificity: Training must be relevant to your sport (e.g., a swimmer should swim, not just cycle).
• P - Progressive Overload: Gradually making training harder so the body adapts.
• O - Overload (FITT): You change the Frequency (how often), Intensity (how hard), Time (how long), or Type of exercise.
• R - Reversibility: If you stop training, you lose your gains ("Use it or lose it!").
• T - Recovery: The body needs rest to repair and get stronger.
Periodisation: The Master Plan
Athletes don't train at 100% all year. They divide their year into cycles:
• Macrocycle: The big picture (usually a whole year or 4 years for Olympians).
• Mesocycle: A 4-12 week block focusing on one goal (e.g., building strength).
• Microcycle: A single week or even a single day of training.
They also go through phases: Preparation (pre-season), Competition (the season), and Transition (off-season/rest).
Tapering: Reducing training just before a big race so you are fresh.
Peaking: Timing your training so you are at your absolute best for the most important competition.
Specific Training Methods
• Continuous: Low intensity, long duration (e.g., jogging for 40 mins). Improves aerobic power.
• Fartlek: Swedish for "speed play." Changing speed and terrain during a run.
• HIIT: High Intensity Interval Training. Short bursts of 100% effort followed by rest. Great for anaerobic power.
• Circuit: Moving between different stations. Good for muscular endurance.
• Weight Training: Using resistance to build strength.
• PNF (Proprioceptive Neuromuscular Facilitation): An advanced stretching technique where you stretch, contract the muscle against resistance, then stretch further. It's the best way to improve flexibility.
Key Takeaway: Effective training must be specific, progressively harder, and planned using cycles (Macro/Meso/Micro).
3.2.1.3 Injury Prevention and Rehabilitation
Even the best athletes get hurt. Understanding injury helps them get back on the field faster.
Types of Injury
• Acute: These happen suddenly. Examples: Fractures (broken bones), dislocations, strains (muscle), and sprains (ligament).
• Chronic: These develop over time from "overuse." Examples: Achilles tendonitis, stress fractures, or 'tennis elbow'.
Prevention: Stopping injuries before they happen
• Screening: Checking an athlete for imbalances or weaknesses before the season starts.
• Protective Equipment: Using shin pads, helmets, or gum shields.
• Warm-up: Increasing heart rate and stretching muscles (static or ballistic) to prepare them for work.
• Taping and Bracing: Supporting weak joints to prevent them from rolling or twisting.
Rehabilitation: Fixing the damage
If an injury occurs, we use these methods:
• Proprioceptive Training: Exercises like using a wobble board to regain balance and "joint awareness."
• Hyperbaric Chambers: The athlete sits in a high-pressure room with 100% pure oxygen. This forces more oxygen into the blood to speed up tissue repair.
• Cryotherapy: Using extreme cold (ice baths or cryo-chambers) to reduce swelling and pain by constricting blood vessels.
• Hydrotherapy: Using water for exercises. The buoyancy of water supports the body weight, making it easier to move injured joints.
Recovery: The final step
Don't underestimate the basics!
• Compression Garments: Tight clothing that helps blood flow back to the heart and reduces swelling.
• Massage/Foam Rollers: Helps break down scar tissue and increases blood flow to muscles.
• Sleep and Nutrition: This is when the real repair happens! Without 8+ hours of sleep and the right protein/carbs, the body won't heal.
Common Mistake to Avoid: Many students think "Cryotherapy" and "Hyperbaric Chambers" are the same. Remember: Cryo = Cold (to reduce swelling); Hyperbaric = Oxygen (to speed up healing).
Key Takeaway: Acute is sudden; Chronic is overuse. Rehab uses cold, oxygen, and water to get the athlete back to full fitness.
Final Quick Review Box
Diet: Carbs for energy, Protein for repair.
Training: Use FITT and SPORT to plan. Use Periodisation (cycles) to peak at the right time.
Injury: Prevention is better than cure! Use Cryotherapy for swelling and Hyperbaric chambers for fast healing.
Well done! You've made it through Exercise Physiology. Keep reviewing these key terms, and you'll be an expert in no time!