Question

Bo and Evan have been on the same diet and exercise program. Bo has bulked up more than Evan. Which of the following statements explains why this may have occurred?

A. Bo has a greater percentage of fast-twitch bers than Evan has.
B. Evan has a greater percentage of fast-twitch bers than Bo has.
C. Bo has a greater percentage of slow-twitch bers than Evan has.
D. Evan must not have been doing the exercises right, or the results would have been the same.

Answer 1

Bo likely has a greater percentage of fast-twitch muscle fibers than Evan, which would explain why Bo has experienced more muscle growth despite following the same diet and exercise program.

Step-by-step explanation:

The differences in muscle development between Bo and Evan can be attributed to the different types of muscle fibers predominant in their bodies. Fast-twitch muscle fibers contribute more to muscle size and strength and have a greater potential to increase in mass, whereas slow-twitch muscle fibers are more efficient for endurance, being rich in capillaries, mitochondria, and myoglobin which sustain aerobic activities longer. Therefore, the likelihood is that Bo has a greater percentage of fast-twitch fibers than Evan, which explains why Bo has bulked up more.