2. Physical Demands of Performance

Health-Related vs Performance-Related Fitness

Physical fitness is your ability to carry out everyday tasks and sporting activities without getting overly tired. The syllabus divides fitness into two main branches: health-related components, which everyone needs for general wellbeing, and performance-related components, which athletes develop for specific sports.

Health-Related Components

These five components protect against hypokinetic conditions, such as heart disease and type 2 diabetes, while keeping you mobile and energetic in daily life:

• Cardiorespiratory endurance: The ability of the heart, lungs, and blood vessels to deliver oxygen to working muscles during sustained exercise. For instance, a Gaelic football midfielder needs high cardiorespiratory endurance to maintain a high work rate for the full 70 minutes.
• Muscular strength: The maximum force a muscle or muscle group can exert against a resistance in a single maximal effort ($1\text{RM}$). A rugby prop locking out a scrum depends heavily on this.
• Muscular endurance: The ability of a muscle group to perform repeated contractions over an extended period without fatiguing. Think of a rower completing over 200 drive phases in a $2{,}000\text{ m}$ race.
• Flexibility: The range of motion available around a joint. A hurdler clearing a barrier with full hip mobility demonstrates this clearly.
• Body composition: The relative percentage of muscle, fat, bone, and other tissues that make up body weight. A marathon runner typically benefits from low body fat to maximise running economy.

Performance-Related Components

These six components determine how effectively you can perform the motor skills required in sport:

• Agility: The ability to change direction at speed with balance and control. A basketball guard cutting past a defender into the key uses agility on every drive.
• Balance: The ability to maintain equilibrium while stationary (static balance) or moving (dynamic balance). A gymnast on the beam needs static balance in a hold and dynamic balance throughout their tumbling run.
• Coordination: The ability to move two or more body parts together smoothly and efficiently. A tennis player timing their footwork and arm swing to strike a forehand is a classic example.
• Power: The ability to exert maximal force in as short a time as possible, combining strength and speed ($\text{Power} = \text{Force} \times \text{Velocity}$). A volleyball player jumping to spike above the net relies on explosive leg power.
• Speed: The rate at which an individual covers distance or moves a limb per unit time. A winger accelerating over 20 metres to reach a through ball demonstrates sprint speed.
• Reaction time: The time taken between the presentation of a stimulus and the initiation of a muscular response. A hockey goalkeeper reacting to a deflected strike needs rapid reaction time.

The Relationship Between the Two

Exam questions often ask whether health-related and performance-related fitness are distinct. They are different in purpose: an older adult needs cardiorespiratory fitness and strength to walk comfortably and stay healthy, but has no practical need for agility or explosive power. In sport, however, performance-related fitness rests on a foundation of health-related fitness. An outfield player cannot use their agility or sprint speed effectively late in a match if their aerobic endurance is poor.

Fitness Testing: Batteries, Validity, Reliability, and Sequencing

A fitness test battery is a planned series of individual tests selected to profile the precise physical demands of a named sport. There is no one-size-fits-all battery. You would never assess a shot-putter with the multi-stage fitness test, because aerobic endurance has little bearing on a single explosive throw.

Standard Tests for Each Component

When answering exam questions on test selection, always state the component, the recognised test, and a sporting justification:

• Cardiorespiratory endurance: Multi-Stage Fitness Test (bleep test) or Cooper 12-minute run.
• Muscular strength: Handgrip dynamometer or 1-rep max (1RM) bench press or squat.
• Muscular endurance: 1-minute press-up test, timed plank hold, or 1-minute sit-up test.
• Flexibility: Sit-and-reach test.
• Body composition: Skinfold calliper assessment at standard sites. Body Mass Index (BMI) is easy to calculate, but it cannot separate muscle from fat mass. A heavily muscled rugby player will often register as overweight or obese on BMI charts.
• Agility: Illinois agility test or T-test.
• Balance: Stork stand test.
• Coordination: Alternate-hand wall toss test.
• Power: Vertical jump test (Sargent jump) or standing broad jump.
• Speed: 30-metre sprint using electronic timing gates.
• Reaction time: Ruler drop test.

Validity and Reliability

These two principles underpin all sound physical testing:

• Validity means the test measures what it claims to measure. A 30-metre sprint using electronic gates is a valid measure of running speed and acceleration, but it is not a valid measure of reaction time. The timing gates trigger only after the runner moves through the beam, so they capture travel time rather than the gap between a signal and movement initiation.
• Reliability means the test produces consistent, repeatable results under identical conditions. If an athlete retests later the same day without intervening training, their score should be virtually identical. To keep tests reliable, you must standardise the environment, test surface, warm-up protocol, equipment calibration, and tester instructions.

Order of Administration

Fatigue ruins test validity. If you administer a bleep test first, the athlete's legs will be full of lactate, meaning their vertical jump and 30-metre sprint scores will be artificially low. The recommended sequence is:

1. Non-fatiguing tests: height, weight, resting heart rate, and skinfold measurements.
2. Agility tests: Illinois agility test, which demands a fresh neuromuscular system.
3. Maximal strength and power: vertical jump or 1RM.
4. Sprint tests: 30-metre sprint.
5. Muscular endurance: 1-minute press-ups or timed plank.
6. Cardiorespiratory endurance: Multi-Stage Fitness Test. This always comes last because exhaustive aerobic running depletes glycogen and causes severe fatigue.