2016.08.11 CSCS Daily Study Question:
A limb and muscle that replicate a second-class lever setup is moving in an eccentric muscle action. Which of the following is true?
(A) The muscular force is greater than the resistive force on opposite sides of the lever fulcrum
(B) The muscular force is greater than the resistive force on the same side of the lever fulcrum
(C) The muscular force is less than the resistive force on opposite sides of the lever fulcrum
(D) The muscular force is less than the resistive force on the same side of the lever fulcrum
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Correct Answer:
(D) The muscular force is less than the resistive force on the same side of the lever fulcrum
Explanation:
Pay no attention to the picture above the question; it’s just there to distract you. If you look at the question, it asks about a “second-class” lever. First-class levers have muscular and resistive forces on opposite sides of a fulcrum. Second- and third-class levers have forces that act on the same side of the fulcrum. The difference between a second- and third- class lever is the length of the muscular and resistive moment arms. Second-class levers have a moment arm of muscular force that is greater than the moment arm of resistive force, making them more mechanically efficient. Third-class levers have a moment arm of resistive force that is greater than the moment arm of muscular force, making them less mechanically efficient. Since the question states that the muscle action is “eccentric” we know that the resistive force is currently greater than the amount of muscular force applied.
Reference:
Essentials of Strength Training & Conditioning 3rd edition p. 69 – 70, 78
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2016.08.11 CSCS Daily Study Question