ESS 345: CHAPTER SIX EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS
Catastrophe Theory
Once fatigue begins it creates a chain reaction of system failures (hard to pinpoint where fatigue begins)
Fatigue
Inability to maintain required power output to continue muscular work at given intensity
What is fatigue influenced by?
Type/Intensity of exercise
Muscular Fiber Type
Training Status/Diet
Performance Velocity or Power
Performance VO2 + Performance O2 Deficit x Gross Mechanical Efficiency
Factors of Performance VO2
Lactate Threshold VO2 and Maximal Oxygen Consumption
Potential Causes of fatigue?
Overuse
Lack of O2
Lack of carb delivery
, Hydrogen ion accumulation
CO2 accumulation
What is the main cause of fatigue?
Muscle damage
Golgi Tendon Organs
proprioceptors (sensory receptor) responsible for the stretching of the muscle to prevent injury
How is the optimal muscle length found?
Length/Tension relationship
Central Fatigue
Where the impulses come from
Serotonin is disrupted by activity
Reduced excitability in motor cortex
Strength of the signal comes from the CNS
Where does peripheral fatigue occur?
Local muscle and neuromuscular junction
Four major causes of fatigue
- inadequate energy delivery/metabolism
- Accumulation of metabolic by-products
- Failure of muscle contractile mechanism
- Altered neural control of muscle contraction
ANSWERS WITH COMPLETE SOLUTIONS
Catastrophe Theory
Once fatigue begins it creates a chain reaction of system failures (hard to pinpoint where fatigue begins)
Fatigue
Inability to maintain required power output to continue muscular work at given intensity
What is fatigue influenced by?
Type/Intensity of exercise
Muscular Fiber Type
Training Status/Diet
Performance Velocity or Power
Performance VO2 + Performance O2 Deficit x Gross Mechanical Efficiency
Factors of Performance VO2
Lactate Threshold VO2 and Maximal Oxygen Consumption
Potential Causes of fatigue?
Overuse
Lack of O2
Lack of carb delivery
, Hydrogen ion accumulation
CO2 accumulation
What is the main cause of fatigue?
Muscle damage
Golgi Tendon Organs
proprioceptors (sensory receptor) responsible for the stretching of the muscle to prevent injury
How is the optimal muscle length found?
Length/Tension relationship
Central Fatigue
Where the impulses come from
Serotonin is disrupted by activity
Reduced excitability in motor cortex
Strength of the signal comes from the CNS
Where does peripheral fatigue occur?
Local muscle and neuromuscular junction
Four major causes of fatigue
- inadequate energy delivery/metabolism
- Accumulation of metabolic by-products
- Failure of muscle contractile mechanism
- Altered neural control of muscle contraction
