Lecture 7
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Questions and Answers

What is the rate of age-related loss of skeletal muscle mass?

  • 5 to 10% per year
  • 0.5 to 1% per year (correct)
  • 2 to 3% per year
  • More than 10% per year
  • In disuse and illness, what can be said about the loss of skeletal muscle mass and function?

  • It remains constant
  • It increases slightly
  • It accelerates dramatically (correct)
  • It decreases slightly
  • What is the likely factor influencing muscle fiber atrophy during disuse according to the text?

  • Model of disuse and muscle group (correct)
  • Genetic predisposition
  • Sleep patterns
  • Dietary intake
  • What is a key aspect of neural sites for loading-induced increases in strength according to the text?

    <p>Type-specificity of training</p> Signup and view all the answers

    What is a key factor contributing to the rapid increase in muscle strength?

    <p>Agonist activation</p> Signup and view all the answers

    What is the most common observation related to increased EMG during isometric knee extensor training?

    <p>Increased agonist EMG</p> Signup and view all the answers

    How does decreased antagonist activation affect force expression of the agonist muscle?

    <p>Limits force expression</p> Signup and view all the answers

    Where do the adaptations related to muscle strength increase primarily occur?

    <p>Specific to task-specific training</p> Signup and view all the answers

    What type of loading shows significant improvements in isotonic weight training?

    <p>Isotonic loading</p> Signup and view all the answers

    Which factor is necessary for joint stabilization even though it limits force expression of the agonist muscle?

    <p>Increased antagonist activation</p> Signup and view all the answers

    Which muscle fibers are most affected by disuse in terms of atrophy?

    <p>Both type I and II fibers</p> Signup and view all the answers

    In disuse, what happens to twitch force in muscles?

    <p>It decreases</p> Signup and view all the answers

    During disuse, which type of muscle fibers show atrophy?

    <p>Both type I and II fibers</p> Signup and view all the answers

    What is the impact of disuse on voluntary force in muscles?

    <p>It decreases</p> Signup and view all the answers

    In the context of muscle growth, what actually 'grows' in response to loading?

    <p>Myofibrils</p> Signup and view all the answers

    What is the typical timeline for the late phase of adaptations to strength training?

    <p>Months to years</p> Signup and view all the answers

    What is the primary factor that leads to muscle growth?

    <p>Muscle protein synthesis surpassing breakdown</p> Signup and view all the answers

    In muscle growth, what leads to net accretion of contractile tissue?

    <p>High-load resistance training</p> Signup and view all the answers

    What type of hypertrophy is suggested to occur with low-load resistance training?

    <p>Fiber-specific hypertrophy</p> Signup and view all the answers

    What is a key factor in muscle growth in adults due to loading?

    <p>Increase in myofibril size</p> Signup and view all the answers

    What is the impact of training specificity on strength improvement?

    <p>Short-term strength gains are task-specific</p> Signup and view all the answers

    Which factor is crucial for muscle growth as outlined in the text?

    <p>'Heavy' resistance exercise combined with protein intake</p> Signup and view all the answers

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