Fatigue and the recovery process

What is Fatigue?

Fatigue is a reduction in the ability to perform physical activity effectively.

Main Causes of Fatigue

1. Lactic Acid Accumulation: Builds up during high-intensity anaerobic exercise, causing pain and reduced performance. Common in 400m sprints and repeated sprint activities.
2. Depletion of Energy Stores: Low levels of ATP, phosphocreatine, and glycogen reduce exercise capacity. Common in endurance events.
3. Dehydration: Fluid loss leads to reduced blood volume and performance. Effects include dizziness and fatigue.
4. Increased Body Temperature: High body temperature inhibits performance, especially in hot environments.
5. Mental Fatigue: Long concentration periods lower motivation and focus.

Effects of Fatigue on Physical Activity and Sporting Performance

Fatigue negatively affects performance through:

1. Physical Effects: Reduced strength, speed, reactions, coordination, and power output.
2. Skill Effects: Lower accuracy, poor timing, and performance mistakes.
3. Psychological Effects: Loss of concentration and reduced motivation.
4. Physiological Effects: Increased breathing and heart rates, muscle pain, and reduced energy production.

Onset of Blood Lactate Accumulation (OBLA) Definition

OBLA occurs when lactic acid accumulates in the blood faster than it can be removed, usually at approximately 4 mmol of lactate per litre of blood.

Why OBLA Happens

During intense exercise, anaerobic glycolysis increases, leading to more lactic acid production than the body can remove.

Effects of OBLA

OBLA causes rapid fatigue, muscle discomfort, and reduced performance.

Importance in Sport

Athletes aim to delay OBLA to maintain higher intensity longer and improve endurance.

Training to Delay OBLA

Training methods include interval training, aerobic training, and lactate threshold training to improve oxygen transport and lactate removal.

Delayed Onset of Muscle Soreness (DOMS) Definition

DOMS is muscle soreness and stiffness felt 24–72 hours post-exercise, typically after unaccustomed, intense, or eccentric contractions.

Causes of DOMS

DOMS results from tiny tears (microtrauma) in muscle fibers, leading to inflammation, soreness, and stiffness.

Symptoms of DOMS

Symptoms include muscle pain, tenderness, reduced movement, stiffness, and temporary strength loss.

Activities Linked to DOMS

Common activities leading to DOMS include downhill running, plyometrics, and heavy resistance training.

Excess Post-Exercise Oxygen Consumption (EPOC) Definition

EPOC, also known as oxygen debt, is the extra oxygen consumed post-exercise to return the body to resting levels.

Why EPOC Occurs

Post-exercise oxygen is needed to restore ATP and PC stores, remove lactic acid, replenish oxygen stores, and normalize body function.

Higher Intensity Exercise = Greater EPOC

Greater exercise intensity results in a higher oxygen debt and longer recovery duration.

Factors That Speed Up Recovery

1. Active Cool Down: Low-intensity exercise post-activity helps remove lactic acid and lowers heart rate.
2. Ice Baths: Immersion in cold water post-exercise reduces inflammation and soreness.
3. Compression Clothing: Tight garments improve circulation and may reduce soreness.
4. Nutrition: Proper nutrition restores energy, with carbohydrates for glycogen and protein for muscle repair.
5. Hydration: Replacing fluids lost through sweating aids in recovery and performance.
6. Massage: Promotes blood flow and muscle relaxation.

Rehabilitation Definition

Rehabilitation is the process of restoring an injured performer back to full fitness and performance.

Aims of Rehabilitation

Rehabilitation aims to reduce pain, restore movement, regain strength, improve flexibility, prevent re-injury, and return safely to sport.

Stages of Rehabilitation

1. Initial Treatment: Involves rest, ice, compression, elevation to reduce swelling and pain.
2. Recovery Phase: Focuses on gentle movement and flexibility restoration.
3. Strengthening Phase: Gradually increases exercises to rebuild strength and stability.
4. Return to Sport: Gradual, monitored progression back into training and competition.

Importance of Rehabilitation

Effective rehabilitation speeds recovery, prevents further injury, and improves long-term performance.

Summary

• Fatigue: Reduction in ability to perform

• OBLA: Lactate builds up faster than removal

• DOMS: Muscle soreness after exercise

• EPOC: Extra oxygen used during recovery

• Active cool down: Helps remove lactate

• Ice baths: Reduce swelling/soreness

• Nutrition: Restores energy and repairs tissue

• Rehabilitation: Restores performer to fitness.