2018.07.08 CSCS Daily Study Question:
What occurs to the A-Band of the sarcomeres within an athlete’s gluteus maximus as she performs the downward movement of the low-bar back squat?
(A) A-Band Contracts
(B) A-Band Lengthens
(C) No Change in A-Band Length
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Correct Answer:
(C) No Change in A-Band Length
Explanation:
The gluteus maximus is one of the major involved muscles of the low-bar back squat exercise. As the downward phase is performed, the muscle is engaged in “eccentric” muscle action. The muscle lengthens during eccentric muscle action. However, the A-Band of the sarcomere corresponds with the lengths of actin filament. The length of actin filaments does not change with muscle contraction or lengthening, therefore the A-Band does not change in length.
Reference:
Essentials of Strength Training & Conditioning 3rd Edition p. 7
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2018.07.08 CSCS Daily Study Question
Links:
National Strength & Conditioning Association