Muscle Fatigue and Crossbridge Function Quiz
15 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the possible sites of peripheral fatigue?

  • Motoneurons, brain, sarcoplasmic reticulum
  • Brain, spinal cord, neuromuscular junction
  • Central fatigue, spinal cord, muscle fiber
  • Motoneurons, neuromuscular junction, muscle fiber (correct)

    • What does fatigue lead to in terms of crossbridge function?

  • Reduction in the number of crossbridges only
  • Increase in the number of crossbridges, force per crossbridge, and/or the rate of crossbridge activation and deactivation
  • Reduction in the number of crossbridges, force per crossbridge, and/or the rate of crossbridge activation and deactivation (correct)
  • No effect on the number of crossbridges, force per crossbridge, and/or the rate of crossbridge activation and deactivation

    • Which side of the force-velocity and power-velocity relationships is more affected by fatigue?

  • None of the sides are affected by fatigue
  • Eccentric side
  • Concentric side (correct)
  • Isometric side

    • What is the effect of fatigue on ISOmax and Vmax?

    <p>Reduced ISOmax and reduced Vmax</p> Signup and view all the answers

    What is a possible cause of central fatigue during a 400 m race?

    <p>Decrease in neurotransmitters</p> Signup and view all the answers

    What contributes to motor unit 'drop-off' during fatigue at MVC?

    <p>Reduction in active muscle fibers</p> Signup and view all the answers

    What is the role of pain/discomfort in motor unit activation?

    <p>Lead to a decrease in motor unit activation</p> Signup and view all the answers

    What is a possible cause of decreased membrane excitability at the motoneuron level?

    <p>Reflex inhibition</p> Signup and view all the answers

    What is a possible cause of peripheral fatigue during a 42 km race?

    <p>Increase in metabolites (ex. H+)</p> Signup and view all the answers

    What does the Interpolated Twitch Technique demonstrate?

    <p>Decrease in motor unit activation (i.e. central fatigue)</p> Signup and view all the answers

    What can overcome some central fatigue?

    <p>Arousal (ex. gunshot, shouting, crowd motivation, etc.)</p> Signup and view all the answers

    What is the effect of pain/discomfort on motor unit activation?

    <p>Lead to a decrease in motor unit activation</p> Signup and view all the answers

    What is the effect of hypoglycemia on cognitive ability?

    <p>Negatively impact cognitive ability</p> Signup and view all the answers

    What is a possible cause of peripheral fatigue during a 400 m race?

    <p>Increase in metabolites (ex. H+)</p> Signup and view all the answers

    What is the effect of pain/discomfort on motor unit firing rates?

    <p>Lead to a decrease in motor unit firing rates</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser