topic 9: fatigue

Question 1

fatigue

Answer 1

a reversible, exercise-induced decline in performance

Question 2

peripheral fatigue

Answer 2

• develops rapidly
• loss of energy delivery
• accumulation of metabolic by-products
• failure of muscle’s contractile mechanism

Question 3

central fatigue

Answer 3

• develops during prolonged exercise
• impaired function of the central nervous system (brain and spinal cord)

Question 4

high activity

Answer 4

• activity: vigorous, intense activity
• time: less than 1-2 seconds
• energy system: anaerobic, ATP-CP, lactic acid
• examples: 100m sprint, powerlifting, interval training

Question 5

endurance

Answer 5

• activity: prolonged sessions of medium intensity
• time: several mins to several hours
• energy system: aerobic (glucose and fats)
• examples: cycling, jogging, 10000m

Question 6

causes of fatigue

Answer 6

• age
• level of fitness
• type of activity or exercise

Question 7

causes of peripheral fatigue in HIGH-INTENSITY activities depends on

Answer 7

depletion of energy sources
- CP used in anaerobic conditions: short duration, high intensity
- CP maintains ATP levels in muscle
increase levels of lactic acid and hydrogen
- increase levels of by-products
- lactic acid build up
- increase H+ ions decrease pH in cell—-> decreased energy production and decreased muscle contraction force

Question 8

causes of peripheral fatigue in endurance activties include

Answer 8

• depletion of glycogen stores (muscle and liver)
• reduction in calcium release (inhibit muscle contraction)
• depletion of acetylcholine (inhibit muscle contraction)
• dehydration (cardiovascular system impaired)
• overheating (cardiovascular system impaired)
• electrolyte loss (neural and muscle function)

Question 9

causes of central fatigue

Answer 9

• failure of neural transmission
  (central fatigue is a protective mechanism)

Question 10

recovery

Answer 10

the main aim of the recovery process is to restore body to pre-exercise state

Question 11

recovery rate

Answer 11

• occurs at different rates
• depends on the type of activity (high intensity, endurance)

Question 12

EPOC

Answer 12

• restoration of cp stores
• removal of lactic acid
• replenish of myoglobin stores
• replacement of glycogen stores