Final answer:
Muscular endurance is primarily impacted by metabolic factors such as aerobic metabolism. Endurance exercises that require low force but involve numerous repetitions predominantly use slow-twitch muscle fibers.
Step-by-step explanation:
Muscular endurance is primarily impacted by metabolic factors rather than neuromuscular factors. Muscular endurance refers to the ability of a muscle to sustain repeated contractions over an extended period without fatigue.
Metabolic factors play a crucial role in providing the necessary energy for muscle contractions. Endurance exercises that require low force but involve numerous repetitions predominantly use slow-twitch muscle fibers. These slow fibers rely on aerobic metabolism, which utilizes oxygen to produce ATP, allowing them to contract for an extended time without fatigue.
Examples of endurance exercises include long-distance running, cycling, and swimming. By engaging in these activities, the body adapts by increasing mitochondrial content, capillary networks, and myoglobin levels in the slow-twitch muscle fibers, enhancing their ability to sustain aerobic activity over time.