Training for long-distance running causes a significant increase in

Question

Quizplus · Accepted Answer

Training for long-distance running primarily targets the slow-twitch muscle fibers, which have a greater capacity for endurance activities. This results in an increase in both the cross-sectional area of these fibers and the number of myofibrils per fiber, leading to an increase in cell size. Therefore, both options A and B are correct. However, there is no evidence to suggest that long-distance running increases the actual number of slow-twitch muscle fibers in the body, so option C is not correct. Thus, the best choice(s) are A and B, making option D the correct answer.

Training for Long-Distance Running Causes a Significant Increase in