2018.06.30 CSCS Daily Study Question:
When heart muscle fibers stretch less…
(A) Heart contractile force decreases
(B) Heart contractile force increases
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Correct Answer:
(A) Heart contractile force decreases
Explanation:
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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2018.06.30 CSCS Daily Study Question
Links:
National Strength & Conditioning Association