Question

plyometric exercises involve ______.
a. eccentric muscle loading and concentric contraction
b. concentric muscle loading and eccentric contraction
c. repeated eccentric muscle loadings and stretching
d. repeated concentric muscle contractions

please select the best answer from the choices provided.

○ a
○ b
○ c
○ d

Explanation:

Plyometric exercises (also known as jump training) work by first eccentrically loading the muscle (lengthening it under load, like in a quick squat before a jump) and then immediately following it with a concentric contraction (shortening the muscle, like the jump itself). Option A matches this mechanism. Option B reverses the loading and contraction types. Option C focuses on repeated eccentric loading and stretching, which is not the core of plyometrics (they need the quick concentric after eccentric). Option D is about repeated concentric contractions, which is more like traditional strength training without the eccentric - concentric coupling of plyometrics.

Answer:

A. eccentric muscle loading and concentric contraction