8 Questions
Which of the following is the primary cause of muscle fatigue?
Build-up of lactic acid
What effect does increased acidity have on glycolytic enzymes?
Decreases their activity
What happens to muscle performance as a result of fatigue?
It decreases
What happens to glycogen stores during exercise?
They deplete
How does the rate of energy production from fat compare to that from glucose?
It is lower
Which of the following contributes to the temporary excess oxygen use after exercise?
Increased temperature in heart and skeletal muscle
What needs to happen for the oxygen debt to be resolved?
Metabolism of lactic acid into CO2 and H2O
What is the primary cause of oxygen debt?
Conversion of lactic acid to glucose
Study Notes
Muscle Fatigue
- Primary cause of muscle fatigue: accumulation of lactic acid and inorganic phosphates
- Increased acidity: inhibits glycolytic enzymes, reducing energy production
Exercise and Energy Production
- During exercise: glycogen stores are depleted
- Rate of energy production from fat: slower compared to glucose
- Energy from fat: primary source during low-intensity, long-duration activities
Oxygen Debt
- Temporary excess oxygen use after exercise: contributes to excess post-exercise oxygen consumption (EPOC)
- Resolution of oxygen debt: repayment of oxygen deficit through increased oxygen intake
- Primary cause of oxygen debt: imbalance between oxygen demand and supply during exercise
Test your knowledge on muscle fatigue and its effects on muscle performance with this quiz. Learn about the causes of fatigue, including the build-up of lactic acid, and how it impacts glycolytic enzymes and the actin: myosin cycle. Explore the various factors contributing to a decrease in muscle performance.
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