Which contraction type can help improve endurance due to its fatigue resistance?

The slow twitch muscle fibers, known as Type 1 fibers, are particularly effective in enhancing endurance due to their high fatigue resistance. These fibers are equipped with a greater number of mitochondria and a better blood supply, enabling them to use oxygen efficiently for aerobic energy production. This characteristic allows them to sustain prolonged periods of contraction and resist fatigue, making them ideal for endurance activities such as long-distance running or cycling.

In contrast, the fast twitch A (Type 2A) fibers have some endurance capabilities, but they primarily excel in activities that require both strength and endurance, such as sprinting or high-intensity intervals. The fast twitch B (Type 2B) fibers are more geared towards explosive movements and power activities, exhibiting significant fatigue and are less suited for long-duration activities. Eccentric contractions pertain to the muscle lengthening under tension; while they can contribute to strength and muscle growth, they don't specifically enhance endurance capabilities like the slow twitch fibers do. Therefore, the unique properties of slow twitch fibers make them the optimal choice for improving endurance.