Cardiac Output and Stroke Volume Adaptations
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Questions and Answers

What adaptation leads to an increase in stroke volume due to an increase in left ventricle mass?

  • Increased compliance
  • Increased blood pressure during exercise
  • Increased contractility (correct)
  • Decreased contractility
  • Which physiological change does NOT contribute to an increase in aerobic capacity?

  • Decreased blood volume (correct)
  • Increased left ventricle mass
  • Increased stroke volume
  • Increased compliance
  • During endurance training, which adaptation is likely to occur more significantly than in strength training?

  • Decreased compliance
  • Decreased blood volume
  • Increased stroke volume
  • Increase in left ventricle mass (correct)
  • Which of the following changes is associated with improved filling of the heart during diastole?

    <p>Increased compliance of the heart</p> Signup and view all the answers

    Hypertrophic cardiomyopathy is most associated with which physiological consequence?

    <p>Increased risk of sudden cardiac death</p> Signup and view all the answers

    What effect does increased left ventricle mass have on stroke volume during training adaptations?

    <p>Enhances myocardial contractility</p> Signup and view all the answers

    Which adaptation results from an increase in blood volume during endurance training?

    <p>Increased preload</p> Signup and view all the answers

    How does increased compliance of the heart chambers affect cardiac efficiency?

    <p>Enhances rapid filling of the chambers</p> Signup and view all the answers

    What is a physiological consequence of adaptations that improve aerobic capacity?

    <p>Enhanced oxygen delivery to muscles</p> Signup and view all the answers

    Which factor contributes to the increase in stroke volume more significantly in strength training compared to endurance training?

    <p>Increased blood pressure during exercise</p> Signup and view all the answers

    Study Notes

    Adaptations that Increase Stroke Volume (=> Cardiac Output)

    • Increased left ventricle mass by approximately 20%
      • Increase in contractility
        • Note: A larger increase occurs with strength training compared to endurance training due to the increased pressure.
      • Faster relaxation (Filling)
    • Increased blood volume
      • Increases end-diastolic volume (EDV)

    Hypertrophic Cardiomyopathy

    • Leading cause of sudden cardiac death in young athletes.

    Aerobic Adaptations

    • Training adaptations lead to an increase in stroke volume (SV) which causes an increase in cardiac output (CO).
    • Increased left ventricle mass (approximately 20%)
      • This is driven by an increase in contractility
      • Strength training results in larger increases compared to endurance training due to the increased pressure applied
    • Increased compliance
      • Faster relaxation of the left ventricle, allowing for faster filling
    • Increased blood volume
      • This increases the end diastolic volume (EDV)

    Hypertrophic Cardiomyopathy (Pathological)

    • The leading cause of Sudden Cardiac Death (SCD) in young athletes is Hypertrophic Cardiomyopathy.

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    Description

    Explore how adaptations such as increased left ventricle mass and blood volume contribute to enhancing stroke volume and cardiac output. Understand the implications of these adaptations, particularly in the context of hypertrophic cardiomyopathy and athletic performance.

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