Which term refers to the growth of individual muscle fibers?

Prepare for the AFAA Group Fitness Instructor Test. Use flashcards and multiple choice questions, complete with hints and explanations. Get ready to ace your exam!

Multiple Choice

Which term refers to the growth of individual muscle fibers?

Explanation:
Hypertrophy is the growth of individual muscle fibers. When you train with resistance, those fibers enlarge by adding contractile proteins and other cellular components, increasing their cross-sectional area. This is different from increasing the number of fibers, which is not common in humans. Endurance relates to stamina and the muscle’s oxidative capacity, not fiber size. Strength is about how much force a muscle can produce, which can involve neural adaptations and some hypertrophy, but the term for fiber growth itself is hypertrophy. Power combines force and speed.

Hypertrophy is the growth of individual muscle fibers. When you train with resistance, those fibers enlarge by adding contractile proteins and other cellular components, increasing their cross-sectional area. This is different from increasing the number of fibers, which is not common in humans. Endurance relates to stamina and the muscle’s oxidative capacity, not fiber size. Strength is about how much force a muscle can produce, which can involve neural adaptations and some hypertrophy, but the term for fiber growth itself is hypertrophy. Power combines force and speed.

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