An elite endurance athlete would most likely have a higher count of what type of muscle fiber?

An elite endurance athlete primarily engages in activities that require sustained energy output over long periods, which relies heavily on aerobic metabolism. Type I muscle fibers, also known as slow-twitch fibers, are characterized by their high resistance to fatigue and ability to utilize oxygen efficiently for energy production. These fibers are well-suited for endurance activities, as they support prolonged efforts like long-distance running or cycling.

Type I fibers have a greater density of mitochondria, which allows for effective aerobic energy production, making them ideal for athletes who excel in endurance sports. They also have a rich blood supply, providing the necessary oxygen to fuel extended physical performance. Therefore, the higher count of Type I muscle fibers in elite endurance athletes underlines their physiological adaptation to sustained aerobic activities, enhancing their overall performance in such disciplines.