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Fatigue and Recovery (Elevated Body Temperature (Redistribution of blood…
Fatigue and Recovery
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Fatigue can be:
Local: Experienced in one or more muscle groups and is generally when a muscle group feels tired/heavy
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Muscle Specific: Just affects the muscle group and generally happens faster e.g. An athlete will more likely fatigue quicker on a bike VO2 Max text (quadriceps muscle) than a treadmill VO2 Max test (whole body)
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Fuel Depletion
Glycogen Depletion
Occurs in events that last over an hour. The rate of ATP resynthesis decreases quickly (50 100% slower) once the body switches to fats as the main fuel source
Hitting the Wall
Associated with the aerobic system. A term used in endurance sports to describe a condition caused by the depletion of glycogen stores in the muscles and liver. To effectively break down fats as a fuel source, the body needs to have glycogen available. Fats are used at a significantly slower rate when glycogen stores are depleted, ∴ the athletes feel like they are "hitting a wall" due to decreased rate of ATP resynthesis
CP Depletion
CP stores exhaust in around 10 seconds and need 3 minutes of passive recovery for ~98% replenishment. Depleted CP stores results in an increased reliance on the anaerobic glycolysis system ∴ a slower rate of ATP resynthesis which decreases performance
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Metabolic By-Products
Active Recovery
Maintains higher oxygen levels and this speeds up the removal of lactate. Prevents venus pooling - blood pooling in inactive muscles
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Accumulation of H+ ions
H+ ions accumulate which causes the pH to decrease, resulting in acidosis which inhibits muscle function, the increases of H+ ions causes the athlete to fatigue (slow down)
Neuromuscular Factors
Decreased CNS Firing
The brain detects fatigue and sends weaker signals to the working muscles in an effort to reduce intensity. This slows down work rate of muscles as a self protective mechanism. Passive recovery or resting will allow the CNS to recover
Fatigue can occur at its optimal level. Our response to fatigue depends on: The type/intensity/duration of the activity, fitness level/mental state of the performer, muscle fibres being used, type of muscular contractions occurring, amount of metabolic by-products being produced, hydration levels