9 - Fatigue

A revise letter exercise induced decline in performance

Why they fatigue: • impaired blood flow • ion imbalance within muscles • lactic acid build up • calcium release in impaired Symptoms of fatigue: • muscle weakness • dizziness • headache • short breath • muscle cramps

1) peripheral fatigue : from short exercises • develops rapidly • caused by reduced muscle cell force • depletion of energy resources • lactic acid build up Sport example: sprinting 2) Central (mental) fatigue : during prolonged exercise • impaired function of the central nervous system Sport example: long distance running

Refers to how much energy is used when exercising

Involves rigorous intense exercise that may last for less than a second to as long as 1/2 minutes, anaerobic process of ATP

Involves prolonged sessions of low intensity exercise that may last several minutes to several hours, aerobic process

Fatigue is perceived different by everyone and can be affected by multiple factors such as age, level of fitness ect On a physiological level, the development of peripheral fatigue in HIGH INTENSITY ACTIVITIES depends on the rate of: • depletion of energy resources ( creation phosphate and ATP) • increase levels of products such as lactate or hydrogen ions When the body exercises the level of acidity increases, meaning hydrogen ions increase. (Hydrogen ions measure the acidity) On a physiological level causes of peripheral fatigue in ENDURANCE ACTIVITIES depend on: • depletion of muscle and liver reserves • reduction is Calcuim release • depletion in acetylcholine • dehydration • electrolyte loss • overheating Central fatigue is caused by a failure of neural transmission

Excess post oxygen consumption (EPOC) : • restoration of muscle creatine • removal of lactic acid • replenishment of myoglobin stores • replacement of muscle and liver glycogen stores