The nurse knows the differences between slow-twitch fibers and fast-twitch muscle fibers. Slow-twitch fibers can be described by which of the following statements listed below? Select all that apply
A)
Perform lower-intensity work for prolonged periods.
B)
Run long distances such as a marathon.
C)
Have more efficient high-intensity workouts at the gym.
D)
Utilize anaerobic metabolism as a source of energy.
E)
Participate in a long-distance bike marathon.
Ans:
A, B, E
Feedback:
Slow-twitch fibers, which are smaller than fast-twitch fibers, tend to produce less overall force but are more energy efficient and better suited biochemically to perform lower-intensity work for prolonged periods. Examples of exercises that use slow-twitch fibers are long-distance running, swimming, and cycling, where endurance is desired. Fast-twitch fibers are suited for high-intensity workouts and utilize anaerobic metabolism.
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