2017.04.12 CSCS Daily Study Question:
An athlete begins aerobic endurance exercises. As a result of the exercise, venous return increases causing the myocardial fibers to stretch more. As a result of the increased myocardial stretch, which of the following occurs?
(A) Ejection fraction decreases
(B) Ejection fraction increases
(C) No change in ejection fraction
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Correct Answer:
(B) Ejection fraction increases
Explanation:
During exercise, venous return increases. Venous return is the amount of blood returning to the heart from systemic circulation. More blood returning to the heart causes the muscle fibers of the heart (myocardial fibers) to stretch more, increasing their force of contraction. Exercise also increases the actions of catecholamines such as epinephrine and norepinephrine which cause more forceful ventricular contractions. As a result of increased force of ventricular contraction, the heart ejects a greater amount of blood, thus increasing the ejection fraction.
Reference:
Essentials of Strength Training & Conditioning 3rd Edition p. 122-123
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The Certified Strength and Conditioning Specialist (CSCS) exam by the National Strength and Conditioning Association (NSCA) is a four-hour-long, pencil and paper or computer-based examination. The Certified Strength and Conditioning Specialist exam has two sections: “Scientific Foundations” and “Practical / Applied.” Each of these sections consist of questions that the National Strength and Conditioning Association (NSCA) feels are relevant to test the knowledge and experience of a candidate for the Certified Strength and Conditioning Specialist (CSCS) professional credential. Certified strength conditioning specialist comprehensive questions from the Scientific Foundations section include anatomy, exercise physiology, biomechanics, and nutrition. certified strength conditioning specialist comprehensive questions from the Practical / Applied section include program design, exercise techniques, testing and evaluation, and organization / administration (NSCA, 2015).
2017.04.12 CSCS Daily Study Question