Welcome to Unit A2 2: The Application of Science to Sports Performance
Welcome to your study notes for A2 2: The Application of Science to Sports Performance! Whether you are aiming for top marks or looking to build solid confidence across the core scientific ideas, this guide will break down the essential concepts step by step.
In this chapter, we explore how psychology, physiology, and biomechanics combine to explain how athletes learn skills, control their minds, fuel their bodies, and optimize their physical movements. Don't worry if some of the scientific terminology feels challenging at first—take it one section at a time!
Part 1: Psychological Factors in Performance
1. Personality and Sport
Why do athletes react differently to high-pressure situations? Sports psychologists look at personality through three primary perspectives:
• Trait Theory: Suggests that personality is innate, genetically determined, and stable. According to this view, an athlete has enduring characteristics that predict how they will behave regardless of the sporting situation.
• Social Learning Theory: Proposes that personality and behaviour are learned from observing others (modelling) and through social reinforcement or environmental experiences.
• Interactionist Theory: Combines both views! It suggests that behaviour is a function of an athlete's innate traits interacting with the specific sporting environment. A calm person might become fiercely competitive when stepping onto the pitch because the situation draws out that behaviour.
2. Attentional Control and Selective Attention
Attentional Control is the ability of an athlete to choose what to pay attention to and what to ignore.
• Selective Attention: The process of focusing on relevant environmental cues (such as the flight of the ball or an opponent's movement) while actively ignoring irrelevant cues (such as crowd chants or camera flashes).
Nideffer’s Model of Attentional Focus
Robert Nideffer established that attention varies across two main dimensions: Width (Broad vs. Narrow) and Direction (Internal vs. External). This creates four distinct quadrants:
1. Broad-External: Used to rapidly assess an open, changing environment.
Example: A football midfielder assessing the entire field to spot open teammates and passing lanes.
2. Broad-Internal: Used to analyze and plan tactics or review strategies.
Example: A coach or captain reviewing the overall game plan during a half-time break.
3. Narrow-External: Used to focus outward onto one or two specific cues.
Example: A striker focusing strictly on the penalty spot and the goalkeeper's positioning just before taking a kick.
4. Narrow-Internal: Used to mentally rehearse a specific skill or check one's physiological state.
Example: A golfer mentally rehearsing the smooth swing path of a putt before striking the ball.
3. Mental Preparation Techniques
Athletes use targeted psychological tools to optimize arousal, focus, and confidence:
• Imagery: The process of creating or recreating an experience in the mind using all senses (sight, sound, touch, kinesthetic feel). Athletes use imagery to rehearse complex routines or visualize success.
• Self-Talk: The internal dialogue an athlete has with themselves. Replacing negative thoughts with positive, instructional self-talk helps maintain confidence and channel focus under pressure.
• Goal Setting: Effective goal setting provides direction and motivation. In sports science, goals should strictly follow the SMARTER principle:
• S – Specific: Clear and defined targets.
• M – Measurable: Quantifiable so progress can be tracked.
• A – Agreed: Jointly established between athlete and coach.
• R – Realistic: Challenging yet achievable.
• T – Time-phased: Having a clear deadline.
• E – Exciting: Inspiring and rewarding for the performer.
• R – Recorded: Written down to maintain accountability.
4. Stages of Learning
Skill acquisition progresses through three recognized stages:
1. Cognitive Stage: The beginner stage. Performance requires high conscious thought. The athlete makes many errors, lacks consistency, and relies heavily on external visual and verbal feedback.
2. Associative Stage: The intermediate practice stage. The athlete demonstrates fewer errors, shows much greater consistency, and begins to detect and correct their own errors using internal kinesthetic feedback.
3. Autonomous Stage: The expert stage. Movements are fluent, consistent, and automatic, requiring little to no conscious thought. This frees up cognitive capacity for the athlete to focus entirely on tactics, strategies, and opponents.
Key Takeaway for Psychology: Remember Nideffer's four quadrants and ensure you can match each one with a concrete sporting example. Always spell out SMARTER accurately in goal-setting questions!
Part 2: Physiological and Physical Application
1. The Three Energy Systems
During exercise, the body resynthesizes Adenosine Triphosphate (ATP) using three distinct energy pathways depending on intensity and duration:
• ATP-PC System (Phosphocreatine System): Provides immediate, anaerobic energy for explosive, maximum-intensity bursts. It serves as the primary system for the first 8–10 seconds of all-out effort (e.g., a 100m sprint or heavy Olympic lift). Recovery of phosphocreatine stores takes approximately 2–3 minutes of rest.
• Lactic Acid System (Anaerobic Glycolytic System): Breaks down muscle glycogen without oxygen to produce ATP quickly during high-intensity efforts lasting from around 10 seconds up to 2–3 minutes (e.g., a 400m sprint). Its main limiting factor is the accumulation of lactic acid/hydrogen ions, causing muscle fatigue.
• Aerobic System: Produces vast amounts of ATP utilizing oxygen, breaking down carbohydrates and fats during lower-intensity, long-duration activity (e.g., a marathon or cross-country skiing). Recovery involves restoring glycogen and rehydrating over 24–48 hours.
2. Altitude Training
Altitude training is used by endurance athletes to induce physiological adaptations that enhance oxygen transport.
• Standard Environment: Typically conducted at elevations above 2,000m (approx. 8,000ft).
• Mechanism: The reduction in the partial pressure of oxygen (\(PO_2\)) creates a hypoxic environment. This triggers the kidneys to release the hormone Erythropoietin (EPO), which stimulates the bone marrow to produce more Red Blood Cells (RBCs) and elevate hemoglobin concentration.
• Timeframes: Physiological benefits generally require 2 to 4 weeks of living/training at altitude to manifest. Upon returning to sea level, the performance benefits typically last for approximately 2 to 3 weeks before RBC counts return to baseline.
Common Exam Pitfall to Avoid: Never state that there is "less oxygen" or a "lower percentage of oxygen" at altitude! The proportion of oxygen in the air remains constant at approximately \(21\%\). What decreases is the atmospheric pressure and the partial pressure of oxygen (\(PO_2\)), meaning oxygen molecules are spread further apart.
3. Principles of Training
To safely structure training and ensure steady performance improvements, coaches apply fundamental principles:
• Overload: Working the body harder than normal to force adaptation (manipulated via frequency, intensity, time, or type).
• Specificity: Tailoring training directly to the specific energy systems, muscle groups, and movement patterns of the sport.
• Progression: Gradually increasing the training load over time as the body adapts to prevent plateaus.
• Reversibility: Training adaptations are lost ("use it or lose it") when training ceases or is significantly reduced.
4. Strength and Conditioning: Muscle Contractions
Muscular work is classified into three specific types of contractions:
• Isometric Contraction: Muscle tension develops, but the muscle length remains static with no joint movement (e.g., holding a plank or a rugby scrum engage position).
• Isotonic Contraction: Muscle changes length while producing tension under dynamic movement. It has two phases:
- Concentric: The muscle shortens under tension (e.g., upward lifting phase of a bicep curl).
- Eccentric: The muscle lengthens under tension to control movement against gravity or load (e.g., the downward lowering phase of a squat).
• Isokinetic Contraction: The muscle contracts and shortens/lengthens at a constant, controlled speed against variable resistance, typically achieved using specialized computerized dynamometer machinery.
Key Takeaway for Physiology: Eccentric means lengthening under tension, and altitude training works via lowered \(PO_2\) stimulating EPO and red blood cell production!
Part 3: Biomechanical Principles
Kinetics vs. Kinematics
Biomechanical analysis helps athletes improve efficiency and prevent injury. It is divided into two distinct branches:
• Kinematics: The study and pure description of motion without considering the forces that cause it. Kinematics focuses on measurable movement parameters such as displacement, velocity, and acceleration.
Example: Measuring the linear velocity and angular displacement of a sprinter’s leg during the recovery phase of sprinting.
• Kinetics: The study of the forces that cause, modify, or stop motion.
Example: Measuring the ground reaction force (GRF) exerted by a high jumper’s foot pushing down against the takeoff board.
Quick Memory Tip:
• Kinematics = Kinematograph / Camera (describing the visual movement/speed/path).
• Kinetics = Kinetic energy / Power / Forces (the underlying forces creating that movement).
Quick Review: Essential Terms Summary
• Trait vs. Interactionist: Trait is purely innate; Interactionist is trait combined with the situational environment.
• Nideffer’s Model: Width (Broad / Narrow) \(\times\) Direction (Internal / External).
• SMARTER: Specific, Measurable, Agreed, Realistic, Time-phased, Exciting, Recorded.
• Stages of Learning: Cognitive (thinking/errors) \(\rightarrow\) Associative (practicing/refining) \(\rightarrow\) Autonomous (automatic/tactical).
• ATP-PC: Dominant for the first 8–10 seconds of maximal exercise.
• Altitude Training: Occurs at \(>2,000\text{m}\), lowered \(PO_2\) triggers EPO \(\rightarrow\) increased RBCs; requires 2–4 weeks to develop, lasts 2–3 weeks.
• Kinematics vs. Kinetics: Kinematics describes motion; Kinetics analyzes the forces producing motion.